V8 500 thing of beauty!

[SVboy]

I was riding a few laps at Ruapuna last friday when a van pulled up and a gentleman unloaded a new race bike. On inspection, it was the first run of a homebuilt V8 500cc bike, to be tested by Dennis Charlott. From what I could see, it was 2 cylinder heads off a 250 4[CBR/ZZR etc] grafted onto a custom crankcase, running east/west. The frame/fairings etc appeared custom made. The engineering was exquisite. The headers were a work of art-appearing almost braided![4 of them in 2 banks] The noise was a real crackle] There were a few teething issues, and on its second run a fair bit of smoke came out the back as Dennis came down the straight.
Racing Dave from KiwiRider was there, taking snaps, so watch for an article. Stunning skills, thinking and ability. Watch for it!

[The Pastor]

Wow, i hope that gets into a mag, i wanna see it.

[Oblivion]

Wasn't there a thread a while ago about a V8 ducati?

Anyway I cant wait to see how this one purrs at 14k rpm :drool:

[Indiana_Jones]

That V12 made with two CBX engines looked and sounded mean :)

-Indy

[jasonu]

A few years ago an Aussie outfit (the name escapes me) built a V8 using 2 FZR1000 cylinder blocks and heads mated to their own lower end. I saw pix in Two Wheels taken at one of the Aussie GP's when Mick Doohan was the man.
I think someone else (possibly the same outfit) did something similar to power tube frame cars.

[Crasherfromwayback]

when Mick Doohan was the man.
.

He still is!

[ducatilover]

I bet it sounds absolutely mental, like a small child going through a bandsaw, beautiful

[imdying]

A few years ago an Aussie outfit (the name escapes me) built a V8 using 2 FZR1000 cylinder blocks and heads mated to their own lower end. I saw pix in Two Wheels taken at one of the Aussie GP's when Mick Doohan was the man.
I think someone else (possibly the same outfit) did something similar to power tube frame cars.These guys (http://home.pacific.net.au/~iwd/index.html) IIRC.

[Paul in NZ]

God I just LOVE this stuff.... I'm sooooooo jealous of their ability...

[Kickaha]

From what I could see, it was 2 cylinder heads off a 250 4[CBR/ZZR etc] grafted onto a custom crankcase, running east/west. The frame/fairings etc appeared custom made.

It was built by Chris Gordon and there was an article on the motor in Kiwirider some time ago

Chris has pretty much built everything for the bike himself

Cant wait to see it running myself:woohoo:

[jasonu]

These guys (http://home.pacific.net.au/~iwd/index.html) IIRC.

Yep that's them. I guess my memory is incorrect re the 2 FZR1000 top ends but I am sure someone else used that reciepe for a car motor.

[98tls]

Sounds like fun,like the look of this whilst were on the subject.

[george formby]

Yep that's them. I guess my memory is incorrect re the 2 FZR1000 top ends but I am sure someone else used that reciepe for a car motor.

Caterham for one.http://www.evo.co.uk/carreviews/evocarreviews/49734/caterham.html

[tigertim20]

sounds awesome, look forward to an article on it.:yes:

[george formby]

Sheesh, still no piccies. Am I expected to buy Kiwirider for a gander? The interweb is fallible then.:yes:

[Brett]

http://www.youtube.com/watch?v=5YAFMZyBPI4

[imdying]

Sounds like fun,like the look of this whilst were on the subject.

First time I've ever seen a V8 motorcycle that didn't make me want to puke.

[dangerous]

Sounds like fun,like the look of this whilst were on the subject.
Ducati... 4 of, NICE :woohoo:


As for you lot and ya V8 cars... bugger off to a cage thread :facepalm:


Morbidelli 850 V8 just one of many bike engined bikes...

243911 243912 243913 243914 243915 243916


love this one

<iframe width="425" height="349" src="http://www.youtube.com/embed/YEkiYJ9GH2U" frameborder="0" allowfullscreen></iframe>



and ummm, farking stupid but worth a look/lough, well till the end

<iframe width="425" height="349" src="http://www.youtube.com/embed/K4YmVP6i4qw" frameborder="0" allowfullscreen></iframe>

[Ronin]

This was built by a member of this site. Small block 350 and is a thing of beauty.

http://youtu.be/cVe_n_2r394

[crazy man]

http://images.trademe.co.nz/photoserver/24/182358524_full.jpg
this was build in 84 by yamaha

[gav]

243917243918

[crazy man]

243917243918is it a 500 or 450cc ? for f3

[Kickaha]

is it a 500 or 450cc ? for f3

500cc it wasn't built with F3 in mind, it's been underway for quite some time

[crazy man]

500cc it wasn't built with F3 in mind, it's been underway for quite some timethats a bugger dont think it would be the way to go for f3 but would of been good to see it out there. top job for who ever build it made a dam good job of it!!! was going to build the same type of thing my self one day

[dangerous]

243917243918
now we are talking... thats awesome, love the 8 pipe set up, anyone seen it nakid?

[gav]

I'm not too sure what class you could run it in, probably Clubmens for now?

[gav]

Of course Honda built a V8 750, just that it had oval pistons

http://3.bp.blogspot.com/-GT_1KEuQ418/TacsQBEJO9I/AAAAAAAABC8/uX5E7Z7G-v4/s1600/Honda-NR750-1992-ghosted.jpg

[Crasherfromwayback]

Whilst the NR (Never Ready) had the valve surface area, and the same amount of connecting rods a v8 might have, it's actually a v4.

[gav]

Whilst the NR (Never Ready) had the valve surface area, and the same amount of connecting rods a v8 might have, it's actually a v4.
Go onnnnnnn ................................. :innocent:
Yeah a V4 with oval pistons, or a V8 with pistons joined together :scooter:

[ducatilover]

Whilst the NR (Never Ready) had the valve surface area, and the same amount of connecting rods a v8 might have, it's actually a v4.

Have to agree, still a very cool bike though.

[Crasherfromwayback]

Go onnnnnnn ................................. :innocent:
Yeah a V4 with oval pistons, or a V8 with pistons joined together :scooter:

Cheeky cooont!


Have to agree, still a very cool bike though.

Cool from an engineering point of view...but totally fucking useless!

[ducatilover]

Cheeky cooont!



Cool from an engineering point of view...but totally fucking useless!

Pessimist.



Would have made a mint anchor.

[pritch]

When I made a (rare) trip to Auckland coupla weeks back there were some speedway cars with V8 motors made from two Kawasaki bike engines at the Speed Show.

Clever stuff, but I'm sure some of you know more about them than I do.:yes:

I admire these things, sorta like sidecars, then scratch my nuts and wonder,
"Why would they bother?" :whistle:

[pete376403]

If they were midgets they have a 2.5 litre capacity limit. Over the years there have been all sorts of engines used to try and get max power withing this limit. Originals were the Offenhausers (if you were rich), Sesco chev (5 litre V8 cut in half lengthwise to get a 2.5L 4 cyl. Someone else cut a V8 in half crosswise to get a 2.5 L V4. Big bore Volkswagens were all the rage for while. Maybe the Kawasaki was another attempt to get maximum bang within the limit.

[fokky]

http://www.youtube.com/watch?v=rdxI3faucvM

[dangerous]

Go onnnnnnn ................................. :innocent:
Yeah a V4 with oval pistons, or a V8 with pistons joined together :scooter:

inpossable to call it a v8 as it only has 4 pots... however as no doubt you lot know anyway, it was designed to porform like a v8, I asume rules in GP wouldent allow that, so 8 rods 32 valves and 500cc in the late 70's early 80's. Honda didnt want to follow the stroker way all others were so hence the NR, couldent compet tho.
92 and they built the awesome NR750, all carbon fiber and well ahead of its time, but alas a no beter performer than a 750 of less complercation.

Yeah so a wast of time but so what, no rule saying you have to conform and follow the heard, if ya dont try ya will never know... just a well Briten and our chch v8 guy wearnt/are worried about failing.

[Yow Ling]

Yeah so a wast of time but so what, no rule saying you have to conform and follow the heard, if ya dont try ya will never know... .

Really? Heard of moto3

[slowpoke]

inpossable to call it a v8 as it only has 4 pots... however as no doubt you lot know anyway, it was designed to porform like a v8, I asume rules in GP wouldent allow that, so 8 rods 32 valves and 500cc in the late 70's early 80's. Honda didnt want to follow the stroker way all others were so hence the NR, couldent compet tho.
92 and they built the awesome NR750, all carbon fiber and well ahead of its time, but alas a no beter performer than a 750 of less complercation.

Yeah so a wast of time but so what, no rule saying you have to conform and follow the heard, if ya dont try ya will never know... just a well Briten and our chch v8 guy wearnt/are worried about failing.

From what I've read (I think it was "V-Four Victory"?) the NR was a bit like the R7's and RC45's: massively detuned for the road. There was talk of some pretty farkin' impressive versions developed in the Honda dungeons but when oval pistons were banned by virtually every racing organisation on the planet it all became a bit of a dead end.

[crazy man]

Cheeky cooont!



Cool from an engineering point of view...but totally fucking useless!yer 125 hp out of a 500 with a carbon frame and you say useless! no way

[Crasherfromwayback]

yer 125 hp out of a 500 with a carbon frame and you say useless! no way

You've only gotta check its race results (well, the few it actually finished) to see just how fucking uselss it was mate!

[george formby]

When I made a (rare) trip to Auckland coupla weeks back there were some speedway cars with V8 motors made from two Kawasaki bike engines at the Speed Show.

Clever stuff, but I'm sure some of you know more about them than I do.:yes:

I admire these things, sorta like sidecars, then scratch my nuts and wonder,
"Why would they bother?" :whistle:

Have a spooche around on the interweb, their was a documentary on tee vee about them not too long ago. They where real quick, raced them in the States quite successfully.
Somebody else being very handy in their shed.

[jellywrestler]

A few years ago an Aussie outfit (the name escapes me) built a V8 using 2 FZR1000 cylinder blocks and heads mated to their own lower end. I saw pix in Two Wheels taken at one of the Aussie GP's when Mick Doohan was the man.
I think someone else (possibly the same outfit) did something similar to power tube frame cars.drysdale V8, I was there and the sound was not as pure as you'd expect, almost tacky but it was mighty effort.
At the same meeting was the Hunwick Hallam ridden by mal campbell, aussies answer to the britten!

[jasonu]

If they were midgets they have a 2.5 litre capacity limit. Over the years there have been all sorts of engines used to try and get max power withing this limit. Originals were the Offenhausers (if you were rich), Sesco chev (5 litre V8 cut in half lengthwise to get a 2.5L 4 cyl. Someone else cut a V8 in half crosswise to get a 2.5 L V4. Big bore Volkswagens were all the rage for while. Maybe the Kawasaki was another attempt to get maximum bang within the limit.

Don't forget whatsaname who ran a Suzuki 2 stroke outboard motor midget. Went like stink but couldn't hold together.

[jasonu]

drysdale V8, I was there and the sound was not as pure as you'd expect, almost tacky but it was mighty effort.
At the same meeting was the Hunwick Hallam ridden by mal campbell, aussies answer to the britten!

Yep that was the article in Two Wheels I saw the Drysdale and the HH twin in.

[HenryDorsetCase]

You've only gotta check its race results (well, the few it actually finished) to see just how fucking uselss it was mate!

theres a good chapter in it in this book

http://www.trademe.co.nz/Browse/Listing.aspx?id=396568989

[HenryDorsetCase]

my favourite is still the v12 CBX. though one I can see and smell and touch has to be good.

[crazy man]

You've only gotta check its race results (well, the few it actually finished) to see just how fucking uselss it was mate!to be fair if a 2 stroke fired ever sec stroke like a four stroke it would be even! what would win then! honda were doing the imposable at the time and if it was not for that kind of thing been build were would four strokes be today

[Crasherfromwayback]

to be fair if a 2 stroke fired ever sec stroke like a four stroke it would be even! what would win then! honda were doing the imposable at the time and if it was not for that kind of thing been build were would four strokes be today

To be fair, that's too bad for the four stroke. Honda were only doing it to try and prove four storkes rule, when back then, they certainly didn't. Honda have always been, and will always be anti two stroke. Modern four strokes share nothing other than very over square designs with that oval pistoned pile of shit. If it was a good idea...there'd be modern versions of it now. Notice...there ain't.

[imdying]

If it was a good idea...there'd be modern versions of it now. Notice...there ain't.To be fair, Honda hold all the patents for oval piston technology.

[Crasherfromwayback]

To be fair, Honda hold all the patents for oval piston technology.

And they might as well wipe their corporate arses with them.

[imdying]

Yup, for all they'll ever do with them I expect.

[baffa]

The logic "They dont use it now, there it's a shit idea" is pretty poor tbh.

Most production vehicles switched from Carby to fuel injected in the 80s, but over the last 10 years there have still been heaps of bikes still without injection, mine included. Does that mean Injection is/was shit?

Different engine designs such as the rotary was a revolutionary idea, but the cost of R&D and bucking the established trend proved too hard for most manafacturers, so they stuck with good old pistons rather than trying new technology like say the Quasiturbine.

I'd love to see a modern day attempt at the oval cylinder, the standard piston and cylinder has been around since steam engines, there are better alternatives.

[Crasherfromwayback]

The logic "They dont use it now, there it's a shit idea" is pretty poor tbh.

Most production vehicles switched from Carby to fuel injected in the 80s, but over the last 10 years there have still been heaps of bikes still without injection, mine included. Does that mean Injection is/was shit?
.

The carby vs injection comparison is not a good one I don't think. We all know why injection is so good. Why not try and tell us why oval cylinders and pistons are so shit hot instead.

[Mental Trousers]

If it was a good idea...there'd be modern versions of it now. Notice...there ain't.

It was such a good idea everyone changed the rules to outlaw them after seeing how much the NR750 beat everything else in the Swann Series in Aussie. The problem in GP's was they were being raced on a very uneven playing field. There's no way a 500cc 4 stroke will move as much air as a 500cc stink pot no matter what shape the piston is, they're only moving half the air/fuel. But oval pistons piss all over round ones in 4 stroke racing.


To be fair, Honda hold all the patents for oval piston technology.


The logic "They dont use it now, there it's a shit idea" is pretty poor tbh.

Most production vehicles switched from Carby to fuel injected in the 80s, but over the last 10 years there have still been heaps of bikes still without injection, mine included. Does that mean Injection is/was shit?

Different engine designs such as the rotary was a revolutionary idea, but the cost of R&D and bucking the established trend proved too hard for most manafacturers, so they stuck with good old pistons rather than trying new technology like say the Quasiturbine.

I'd love to see a modern day attempt at the oval cylinder, the standard piston and cylinder has been around since steam engines, there are better alternatives.

Maybe there should be a class limited by how much air gets put through the engine. That way you'd have stink pots vs 4 strokes vs rotaries vs fucken alsorts.

[Crasherfromwayback]

It was such a good idea everyone changed the rules to outlaw them after seeing how much the NR750 beat everything else in the Swann Series in Aussie. The problem in GP's was they were being raced on a very uneven playing field. There's no way a 500cc 4 stroke will move as much air as a 500cc stink pot no matter what shape the piston is, they're only moving half the air/fuel. But oval pistons piss all over round ones in 4 stroke racing.





Maybe there should be a class limited by how much air gets put through the engine. That way you'd have stink pots vs 4 strokes vs rotaries vs fucken alsorts.

They banned TZ700 flat trackers too. But that's hardly the point. Don't get me wrong...NR750's are fucking cool, and I'd give my left and half my right nut to own one. But it's a cunt of an engine design fraught with problems.

[crazy man]

It was such a good idea everyone changed the rules to outlaw them after seeing how much the NR750 beat everything else in the Swann Series in Aussie. The problem in GP's was they were being raced on a very uneven playing field. There's no way a 500cc 4 stroke will move as much air as a 500cc stink pot no matter what shape the piston is, they're only moving half the air/fuel. But oval pistons piss all over round ones in 4 stroke racing.





Maybe there should be a class limited by how much air gets put through the engine. That way you'd have stink pots vs 4 strokes vs rotaries vs fucken alsorts.and as l recall loris capirossi set a speed record on the nr750 as well

[dangerous]

Really? Heard of moto3

"really" sounds like a 15yr olds comment, fucked if I know... tell me bout this moto3?


From what I've read (I think it was "V-Four Victory"?) the NR was a bit like the R7's and RC45's: massively detuned for the road. There was talk of some pretty farkin' impressive versions developed in the Honda dungeons but when oval pistons were banned by virtually every racing organisation on the planet it all became a bit of a dead end.

"really" LOL... na news to me, tell me more I was of the belief the NR5 was a slow beast in comparason to the 500 strokers?


to be fair if a 2 stroke fired ever sec stroke like a four stroke it would be even! what would win then! honda were doing the imposable at the time and if it was not for that kind of thing been build were would four strokes be today
ahhh ya what what... what what? break it down man... I have no idea what ya on about


There's no way a 500cc 4 stroke will move as much air as a 500cc stink pot no matter what shape the piston is, they're only moving half the air/fuel. But oval pistons piss all over round ones in 4 stroke racing..
HUH, so a stroker fires twice as much as a 4 stroke... sucks more juce, wears out a hell of a lot faster to, just like compairing a diesel 4T with a diesel 2T, the 2 stroke makes more power but that comes with a price, economy, reliabilty, maintance, etc...
HEY, hows about designing a 2 cycle 4T, you know same engine design as a 2t diesel, that answer ya problem :scooter:

[Kickaha]

Who fucking cares about some oval pistoned pile of crap and the filthy two strokes, who knows when the V8 has it's next outing?

[dangerous]

Who fucking cares about some oval pistoned pile of crap and the filthy two strokes, who knows when the V8 has it's next outing?
Ohhhh yeah... YOU BASTARDS, stop going :Offtopic:

[slowpoke]

"really" LOL... na news to me, tell me more I was of the belief the NR5 was a slow beast in comparason to the 500 strokers?


Sorry I shoulda been more specific, I meant the NR750 road bike, not the NR500 GP machine.

It mightn't have been successful but the NR500 was still a cool bit of kit. It originally came out with 16 inch wheels when the norm was 18's, weirdo upside down forks with external spring/damping unit, side mounted radiators (3 in total), monococque frame/body. So the engine wasn't the only bit of revolutionary tech goin' on. This is the late 70's. They ended up going more conventional with 18's, conventional frame etc and got the thing more competitive but it was never quite a match for the strokers.

Fast forward a decade or two and most of that stuff had transferred from race exotica to common or garden variety road bikes: fireblades ran 16" front wheels until late 90's, VTR (F and SP), VFR side mount rad's, upside down forks are the norm etc. So while it wasn't successful on track, it certainly wasn't a failure.

That's why I reckon Ducati GP bikes are gonna bounce back: unlike Suzuki who have just trodden the same path, they are being revolutionary, dreaming big, and sooner or later they'll connect the dots to something that works better than everything else. If ya want to go as fast everyone else do what they are doing, if you want to be faster you have to do something different.

Now tell me ya don't wanna throw a leg over this:

244050

[imdying]

That's why I reckon Ducati GP bikes are gonna bounce back: unlike Suzuki who have just trodden the same path, they are being revolutionary, dreaming big, and sooner or later they'll connect the dots to something that works better than everything else. If ya want to go as fast everyone else do what they are doing, if you want to be faster you have to do something different.Thousand monkeys with a thousand typewriters... sounds like Ducati.

[SVboy]

Who fucking cares about some oval pistoned pile of crap and the filthy two strokes, who knows when the V8 has it's next outing?

Dennis still had the motor going when it was smoking badly-if it had grenaded itself, that would not have been the case-hopefully minor teething issues rather than a major failure. I should mention the massive carbon airbox on top, with 8 induction trumpets sticking up into it-big sexytime![Musthave made fabricating the tank a major PITA however.

[codgyoleracer]

And they might as well wipe their corporate arses with them.

Only the big H could come up with a engineering solution to fit a square peg in a round hole......

[HenryDorsetCase]

Sorry I shoulda been more specific, I meant the NR750 road bike, not the NR500 GP machine.

It mightn't have been successful but the NR500 was still a cool bit of kit. It originally came out with 16 inch wheels when the norm was 18's, weirdo upside down forks with external spring/damping unit, side mounted radiators (3 in total), monococque frame/body. So the engine wasn't the only bit of revolutionary tech goin' on. This is the late 70's. They ended up going more conventional with 18's, conventional frame etc and got the thing more competitive but it was never quite a match for the strokers.

Fast forward a decade or two and most of that stuff had transferred from race exotica to common or garden variety road bikes: fireblades ran 16" front wheels until late 90's, VTR (F and SP), VFR side mount rad's, upside down forks are the norm etc. So while it wasn't successful on track, it certainly wasn't a failure.

That's why I reckon Ducati GP bikes are gonna bounce back: unlike Suzuki who have just trodden the same path, they are being revolutionary, dreaming big, and sooner or later they'll connect the dots to something that works better than everything else. If ya want to go as fast everyone else do what they are doing, if you want to be faster you have to do something different.

Now tell me ya don't wanna throw a leg over this:

244050

If I remember (and yes, its OT, but whatever), Honda used the then RSC to train young engineers. Basically said to them "O Hai, heres a clean sheet of paper, go build something to beat two strokes, but we're Honda, a four stroke company, so it has to be a four stroke".

Cue head scratching: how do you make it competitive: there are more moving parts, more friction, you have to power a valve train and deal with friction losses blahdeblah blah. In the 60's Honda had gone for more revs: more cylinders = more revs = more power (so we get twin cylinder 50cc racers, and six cylinder 250's). But the rules say you have a maximum of four cylinders. but we need 8. the answer is kind of obvious but it is the making it work part that was hard. Same with all the other tech thats been mentioned.

So the benefit to the corporation was training a generation of engineers and designers. Sure it woulda been cool to have won more races on it, but that wasn't really the point. Also, the guys involved subsequently all ended up in very senior positions at Honda (again IIRC): one in particular I think became the chairman.

anyway, about the homegrown V8: wez da pix at au??

[Racing Dave]

244062244061244063244064
Dennis still had the motor going when it was smoking badly-if it had grenaded itself, that would not have been the case-hopefully minor teething issues rather than a major failure. I should mention the massive carbon airbox on top, with 8 induction trumpets sticking up into it-big sexytime![Musthave made fabricating the tank a major PITA however.

Don't get hung up on the smoke - that turned out to be oil from the crankcase breather dripping onto the rear set of headers.

To save speculation, the heads/barrels are ZXR250.

As stated earlier in this thread, there's a couple of minor teething problems to attend to, but that's neither surprising or serious. Last Friday was it's first outing and overall Chris was very pleased.

Me too!

Cheers.

[ducatilover]

That has more awesome than I can type!

[george formby]

Quick, pass the hankies:woohoo:

[HenryDorsetCase]

that is stunning. Gizza go Mister?

[Crasherfromwayback]

Work!!!!!!!!!!!!!!!!!!!!!!!

[dangerous]

244062244061244063244064
fuck fuck fuck... wicked, twin crank, why was that?
beautifull frame work and those headers are a work of art, I love the aircraft style exhaust, all straight pipes I asume? :shit:

[Yow Ling]

fuck fuck fuck... wicked, twin crank, why was that?
beautifull frame work and those headers are a work of art, I love the aircraft style exhaust, all straight pipes I asume? :shit:

Because he could ?
if he used a conventional v8 crank it would only have half the bearing area per rod and seeing as this engine is probably pulling well over 20,000 rpm that may not be so good
also he may have done it for cost reasons, by using off the shelf cranks rather than having to design and build a one off at very high cost
Maybe he just did it so a 15 yr old could explain it to you

[ducatilover]

20k rpm you reckon? Good luck. Possible, but, I doubt it.

[HenryDorsetCase]

If it has two cranks, its not a v8 is it? its a square 8 (or something).

still wicked cool though.

[Yow Ling]

20k rpm you reckon? Good luck. Possible, but, I doubt it.

If a stock zxr250 redlines at 19k , 20k isn't much more , I guess it all comes down to mean piston speed

[bogan]

If it has two cranks, its not a v8 is it? its a square 8 (or something).

still wicked cool though.

Yes, while the technical term is not a V8, a term that does apply, is fucking awesome!

Love how the pipes just dump out through the fairing.

[dangerous]

Because he could ?
if he used a conventional v8 crank it would only have half the bearing area per rod and seeing as this engine is probably pulling well over 20,000 rpm that may not be so good
also he may have done it for cost reasons, by using off the shelf cranks rather than having to design and build a one off at very high cost
Maybe he just did it so a 15 yr old could explain it to you

Mike its not like you to be so arrogant, I thought we were over that shit...

I am well awear of the basic reasons why or why not, but I was asking someone who was involved in the project.

To me yes two cranks would make it easier to build, save on width, but be heavier, have more resistance... just to mention a couple of things that come to my wee swead.
Drysdale who did similer built his own botom end, a single crank IIRC... but I was more interested in what this desinger had to say.

[Yow Ling]

Mike its not like you to be so aragant, I thought we were over that shit...


I am well awear of the reasons why or whay not, but i was asking someone who was involved in the project.

To me yes two cranks would make it easier to build, sacve on width, but be heavier, have more resistance... just to mention a couple of things that come to my wee swead.
Drysdale who did similer built his own botom end, a single crank IIRC... but I was more interested in what this desinger had to say.

maybe you shoud have just pm'd him then

[dangerous]

If it has two cranks, its not a v8 is it? its a square 8 (or something)Or something... the RZ5 is a V4 says so on the fairing, but it has two cranks... The RG5 also has two cranks but, the pots sit next to each other not in a vee thus a square 4, so really it is a V8

[dangerous]

maybe you shoud have just pm'd him thenI am and always have been more than interested to here what you have to say.. a lot can and has been learnt from you... but to reply "because he could" is a wast of internet webie space thing, and you know as well as I do it was a knee jerk comment aimed at meeeeeeeeeeeee. ;)


ohh fuck I'm being all sensitive again aint I DOH

[Grumph]

Without being privy to the designers thinking I'd imagine the primary reason behind using two cranks would be economic....there are at least two guys in ChCh who could have made a flat plane crank for it. But prices would start around five grand then you factor in gear cutting and heat treatment incl nitriding....
If using two cranks enabled the thing to be built at all then fine...job done.
Very nice work sir...

[Mental Trousers]

That's fantastic. Although I hope he puts some sort of shroud around the shock otherwise it'll get about 2 laps before the back end turns into a pogo stick.

[HenryDorsetCase]

Yes, while the technical term is not a V8, a term that does apply, is fucking awesome!

Love how the pipes just dump out through the fairing.

absolutely agree.

want to hear/see this bad boy running.

[ducatilover]

If a stock zxr250 redlines at 19k , 20k isn't much more , I guess it all comes down to mean piston speed

Another 1000rpm is a lot, especially at those revs and relying on silly valve springs and conventional cams.

Either way, I really want it and I admire the engineering that's gone in to it.

[bogan]

Without being privy to the designers thinking I'd imagine the primary reason behind using two cranks would be economic....there are at least two guys in ChCh who could have made a flat plane crank for it. But prices would start around five grand then you factor in gear cutting and heat treatment incl nitriding....
If using two cranks enabled the thing to be built at all then fine...job done.
Very nice work sir...

Does the 5k include design too? Because a 19,000rpm crank sounds pretty difficult.

[Racing Dave]

...all will be revealed in Kiwi Rider. although if you leaf back to your October 2006 copy, the full engine design/build story is there. The coming story concentrates on the bike's development.

[Yow Ling]

if you ran it on 7 cylinders it would be eligible for F3 438cc

[Kickaha]

If it has two cranks, its not a v8 is it? its a square 8 (or something).

It has 8 cylinders arranged in a V regardless of how many cranks it has it is a V8


if you ran it on 7 cylinders it would be eligible for F3 438cc

Good thinking and it has already been suggested

[Zamiam]

Now tell me ya don't wanna throw a leg over this:

244050

Its a Honda I'd rather throw my leg over a Sheep! :shutup::facepalm:

[bogan]

It has 8 cylinders arranged in a V regardless of how many cranks it has it is a V8

Except the arrangement of the cylinders only affects the operation (balance/stresses) if they all share a crank, thus defining some of the engine's characteristics. The angle of the second bank doesn't make much difference to how it runs, so in this it is closer to a U engine like the square fours etc. Maybe I am looking at it from too much of an engineering viewpoint, but wikipedia seems to agree.

[slowpoke]

Thousand monkeys with a thousand typewriters... sounds like Ducati.

Exactly! Or to be more specific: 1000 espresso fuelled monkeys.


244062244061244063244064

Don't get hung up on the smoke - that turned out to be oil from the crankcase breather dripping onto the rear set of headers.

To save speculation, the heads/barrels are ZXR250.

As stated earlier in this thread, there's a couple of minor teething problems to attend to, but that's neither surprising or serious. Last Friday was it's first outing and overall Chris was very pleased.

Me too!

Cheers.

Bugger the (cool as fuck) bike, I'd just be happy to have the pegboard setup in the background....my garage looks like a brothel just after the USS Missouri has left town.

[Grumph]

Bugger the (cool as fuck) bike, I'd just be happy to have the pegboard setup in the background....my garage looks like a brothel just after the USS Missouri has left town.

Exactly....that workshop says a lot about the self discipline of the builder and IMO is possibly more impressive than the bike...John B's workshop at the Stables resembled a pigsty.

[crazy man]

it looks like a zxr250 motor with another one modified sitting on the top of the other ones gear box. maybe chain driven togetter under the covers to keep the motor running the same way or gear drive with modified cams. my guess

[Kickaha]

it looks like a zxr250 motor with another one modified sitting on the top of the other ones gear box.

ZXR250 top ends on custom made crankcases