ESE's works engine tuner

[richban]

Here is some 4 stroke shit to annoy you guys - I cant easily post a pic on a PM.
For Rich, here is a pic of carb, I have plenty of different carbs - spigots and bellmouth intakes depending upon what length you want.
The FCRs work real well,should be able to jet them easily enough.
cheers
wob

Thanks for that. Should fit fine. Just for the record its not for the bucket. Although I would love a 33 down draft on the FXR.

[husaberg]

Yes, it may be possible, I have been looking at a MicroSquirt for 2-strokes : http://www.microsquirt.info/indexright.htm

Attachment 247277

I posted some Posi carb pics a while back and alluded to an article I had read
Here it id the observant amonst you will note how slim it is and how it was designed by the same guy that did the Posi, Lectron, EI and Edlebrock quicksilver and no doubt heaps more.
He later said he was good at imaking HP carbs not so good at choosing business partners. His son worked with Kenny Roberts son Curtis interesting.
This carb came after the Ron Gardner flatside. I have never seen pics of the insides of a Gardner carb. But they had a remote float.I think honda had flatslides in the early 60's

[husaberg]

Hard to believe it was 86 and still looks not that different to the last real gp bikes excluding forks and styling. Last page doesn't fit sorry.

[Yow Ling]

While Wobbly has been doing the hard bits, he left me to do the centreline for the pipe. To be honest I been procrastinating on this a bit, turned out to be way easier than I thought

Step 1 make a big exhaust kebab

fit it to the exhaust port

bend it to fit the available space

man that pipe is fat !

[Buddha#81:Me]

While Wobbly has been doing the hard bits, he left me to do the centreline for the pipe. To be honest I been procrastinating on this a bit, turned out to be way easier than I though

so will it be ready for the GP in Taupo or are we taking 4 Diesels up there?

[Yow Ling]

so will it be ready for the GP in Taupo or are we taking 4 Diesels up there?

4 diesels i think

[richban]

4 diesels i think

Could this be the day the 2 strokes shine. The track will favor hp. But really all tracks favor hp. Last year 1st 2nd 3rd. FXR engine's in FXR frames. This year ??? Hope you boys will have your bikes tuned and ready. I am looking forward to catching up with you all, and some hard racing. Are you ready?

[husaberg]

Could this be the day the 2 strokes shine. The track will favor hp. Are you ready?

It's been awhile since anything, favored the Two stroke.
Other than being lighter, faster, better, more reliable and Cheaper to make and modify.
Why were they banned again, maybe little Global Warming wouldn't be such a bad Idea after all.

Cathcarts Story of the NSR500
The most successful GP engine in History?

[husaberg]

Cathcarts Story of the NSR500
The most successful GP engine in History?

Part 2 of the story

More NSR500 pages
http://world.honda.com/MotoGP/history/NSR500/
http://www.fasterandfaster.net/2007/...da-nsr500.html
http://www.bloopers.me/Honda-NSR500-...sgsIbW7WY.html
http://www.superbikeplanet.com/NSR500.htm
http://www.ultimatemotorcycling.com/...Racing_History
http://s307.photobucket.com/albums/n...kes/?start=420

[TZ350]

Could this be the day the 2 strokes shine. The track will favor hp. But really all tracks favor hp. Last year 1st 2nd 3rd. FXR engine's in FXR frames. This year ??? Hope you boys will have your bikes tuned and ready. I am looking forward to catching up with you all, and some hard racing. Are you ready?

I still recon your bike is the one to beat, have you had it on the dyno lately, have you got a graph to post?

[richban]

I still recon your bike is the one to beat, have you had it on the dyno lately, have you got a graph to post?

Yeh it is going really well. I hope it holds together long enough for the GP. BOB will be hard on it. I have given up on the dyno. Every time I go, it just seams like a big wast of money. Something always goes wrong and it ends up costing to much. I think it is running around 26. The Vic Club round at Manfield showed it's potential. Not sure what the real hp of an RG150 is but down the big straight bits we were the same speed.

[koba]

Yeh it is going really well. I hope it holds together long enough for the GP. BOB will be hard on it. I have given up on the dyno. Every time I go, it just seams like a big wast of money. Something always goes wrong and it ends up costing to much. I think it is running around 26. The Vic Club round at Manfield showed it's potential. Not sure what the real hp of an RG150 is but down the big straight bits we were the same speed.

There may have been RG150s run on the same dyno, would be kind of interesting to find out.

I think around 27or a wee bit more from pit-talk.

[koba]

I friendly benefactor has kindly loaned me a treasure trove of two stoke reading to keep me entertained while I'm laid up with a broken wing.

Some of it is 'dated' somewhat but does make fantastic reading and gives a great insight into how attitudes and understandings of things change with advances in technology.

Alot of the fundamental aspects remain unchanged.

From "Two-Stroke PORTS for POWER" by Roy Bacon:

"...while the primary compression ratio determines the maximum engine speed, the transfer ports determine the power output and reliability of the engine by position, timing and direction."

"The transfer port timing and the height of the port are governed by the primary compression ratio and therefore the engine speed."

"Once the primary compression ratio is fixed, the size of the transfer ports and the exhaust lead (Blowdown) can be determined. The use of a high ratio speeds up the transfer process due to the higher crankcase pressures and this enables the size of the transfer passages and ports to be kept down even at high engine speeds. Thus it can be seen that large ports are not necessarily desirable on a high speed engine as the same result can be achieved in a more efficient manner. If a high ratio cannot be obtained, the transfer ports may be made wider increase the total volume of mixture passed but more usually have to be increased in height to give the mixture more time to transfer from the crankcase to the cylinder due to the lower pressure. Should the transfer timing be extended then the exhaust timing will also have to be changed in order to maintain the exhaust lead (Blowdown) This in turn shortens the power stroke and is likely to reduce the torque as well as the maximum power. Thus both acceleration and speed may suffer."


It's interesting seeing how some things have changed and others not so.

"As a general rule, the smaller capacity machines have the larger number of speeds in the gearbox. Thus works racing two strokes may employ a six, seven- or eight-speed gearbox for a 250cc. engine but this figure may rise to ten speeds for a 125 and twelve for a 50cc. engine."

The 3-port engine with loop scavenging is a bit of a novelty at this time by the look of it.

I'm not sure when it was written, it doesn't have a date but I'm guessing probably sometime in the 60's.


That's about the limit of my one-handed typing for tonight! Enjoy!

EDIT: Google tells me it was first published in 1967 http://openlibrary.org/search?q=baco...key=OL2865240A

[husaberg]

I friendly benefactor has kindly loaned me a treasure trove of two stoke reading to keep me entertained while I'm laid up with a broken wing.

Some of it is 'dated' somewhat but does make fantastic reading and gives a great insight into how attitudes and understandings of things change with advances in technology.

Alot of the fundamental aspects remain unchanged.

From "Two-Stroke PORTS for POWER" by Roy Bacon:

That's about the limit of my one-handed typing for tonight! Enjoy!

EDIT: Google tells me it was first published in 1967 http://openlibrary.org/search?q=baco...key=OL2865240A

I've read that book some where it has a Suzuki stinger photo in it and has a large radial finned MX motor on the cover or was that the Draper one
I think it has a port diagram on a 100cc kart motor if I recollect right

[koba]

I've read that book some where it has a Suzuki stinger photo in it and has a large radial finned MX motor on the cover or was that the Draper one
I think it has a port diagram on a 100cc kart motor if I recollect right

Nope, no port diagrams. http://www.amazon.co.uk/Two-stroke-P.../dp/0850770076 shows the cover.