ESE's works engine tuner

[Buckets4Me]

Two strokers come in your pants

Deleted - political issues.

what to many 4 strokers complaining

[wax]

Wobbly Im guessing that the engine stayed as cylinder induction. Do you think it would have made much more if you could have changed it to crank case induction. ??

[husaberg]

Wobbly Im guessing that the engine stayed as cylinder induction. Do you think it would have made much more if you could have changed it to crank case induction. ??

I was looking at a, close to 400cc tzr250 done with Dt200 cylinders today. One model of the 200's even has the aux port exhausts.
70hp but not bad for basically std spec.
Not as cool as Wobs though( one interesting thing with the bike Wob has done is that with the subsitution of a set of US crankcases i guess it would be then BEARS legal. Shit Now that would be controversial wouldn't it!!!!!!


http://www.rzrd500.com/500phpBB2/viewtopic.php?t=7172
http://tzrchronicles.blogspot.co.nz/

350mm x 168mm x 30mm

Getting closer....

- Core: 305*208*40

- Overall: 402*210*45

http://http://www.trademe.co.nz/moto...-487331821.htm

[SwePatrick]

I didn't know that. Patrick. I always thought that piston speed at tdc and at bdc was zero, irrespective of rod length .

hehe.. sorry.. i was thinking you understood me
I mean AROUND td bdc

I wrote it a bit sloppy.. sorry for that

[Frits Overmars]

hehe.. sorry.. i was thinking you understood me . I mean AROUND td bdc . I wrote it a bit sloppy.. sorry for that

I did understand you, Patrick; just wanted to give you a wake-up call. Sloppy writing can be an indication of sloppy thinking, and that wouldn't get you any further .

[wobbly]

The cylinder reed setup is pushed as far as it can be in this engine.In the EngMod simulation it showed that at around 100Hp I needed to increase the time area
of the piston ports as well as make the Boyesen ducts bigger.
I had to CNC cut the cases as well to increase the intake area below the Boyesens.
Case reed has its own problems, in that unless its done well with shrouds over the wheels and the area reduced as much as it can be in front of the petals,the flow from
the reed block simply dumps into a big volume,as opposed to being directed forward and up into the transfer ducts.
Wossner single ring RZ400 Piston is on the right, along with pic of increased area into the case.

PS - the cases I used are brand new Banshee, so it is Bears legal.

[ief]

I see a resemblance



Did you defcon the cases as well? Any pics of that?

[SS90]

PS - the cases I used are brand new Banshee, so it is Bears legal.

B.E.A.R.S legal, How so?
Have the rules changed, or have I misunderstood them?
Yamaha engine parts on a B.E.A.R.S bike I thought would be illegal, whereas chassis parts no problem.

[Grumph]

B.E.A.R.S legal, How so?
Have the rules changed, or have I misunderstood them?
Yamaha engine parts on a B.E.A.R.S bike I thought would be illegal, whereas chassis parts no problem.

Rarely for me, I'm with chubby on this one. You can't have a buck each way - either it's F3 legal or not, but making it legal entails establishing it's RZ based....despite the actual country of manufacture.

I admire the work which has gone into it and wish you well - but shit, the grey areas are huge.

[wobbly]

Sorry I havnt read the actual wording of the BEARS regs, I thought that as the Banshee cases are ( were ) manufactured in USA they would qualify.
The cylinder, crank,gearbox,clutch, waterpump,ignition,pistons,powervalves etc are all bears parts.

Here is pic of case filling, and the CNC model used to machine the ducts to suit the new Boyesen tunnels.

[F5 Dave]

I guess if you used some of those machined from billet cases they would be a-mercan? But at what point does the gearbox & clutch etc become jap to Bears? & if something is a clear replica of a japanese design is that legal? Anyway Bears rules aren't my concern atm.

[wobbly]

Yea, you are right - for example the gearbox is a British NOVA close ratio set but its design came from Japan as RZ - end of story I think.

A bit like being able to build a SmallBlockChev, with no GM parts.

[TZ350]

The effective copper fin area is 50% of the original alloy head fin area, a significant increase in engine cooling capacity. As copper has twice the thermal conductivity of aluminium, does this mean I have doubled the cooling capacity of the head?

Thomas has made another copper head fin for one of the other bikes that has a conventionly domed piston and he was able to form the copper so it became a domed squish band. Seems to work OK.

I found amongst the Kart mags that Husaburg lent me an add by Wiseco for copper cylinder heads.

Making a copper cylinder head was an idea that Thomas and I had thought of for ourselves before we knew anyone else had done it.

So its pleasing to be in the company of real industry people with air cooled engine tuning experiance who thought this approach had merit too.

[husaberg]

Yea, you are right - for example the gearbox is a British NOVA close ratio set but its design came from Japan as RZ - end of story I think.

A bit like being able to build a SmallBlockChev, with no GM parts.

I guess if you used some of those machined from billet cases they would be a-mercan? But at what point does the gearbox & clutch etc become jap to Bears? & if something is a clear replica of a japanese design is that legal? Anyway Bears rules aren't my concern atm.

Husaberg err..Jumped the gun on his quip there for two reasons
One the rules say "non Asian Design" Whoops.
Two the rules allow exclusions at the discretion of the committee.

Supplementary Rules General

1. Motorcycles must be of British, European, or American design with an engine and chassis of non Asian design or manufacture.

2. M.N.Z. Licence required. ONE EVENT LICENCES ARE AVAILABLE AGAIN BUT PLEASE CHECK TO SEE THAT YOU ARE ELIGIBLE PRIOR TO RACE DAY.

3. ALCOHOL FUEL. BEARS 4 stroke machines may use alcohol fuel. Any machine using Alcohol fuel must display “Dangerous Goods” or other appropriate stickers which clearly indicate its use, on the machine in a prominent place

4. Leathers and back protectors compulsory as per M.N.Z. rule book.

5. The onus is on the riders to familiarise themselves with the regulations of the M.N.Z. concerning machine preparation and safety equipment. If in doubt contact any M.N.Z. affiliated club or your local Regional Co-ordinator.

MACHINE ELIGIBILITY for any class is at the discretion of the race committee. Ensure your machine complies with class rules

Oh well they would have banned anyway once it started kicking Ducati Butt (PS the old mans got two Ducati two strokes inc one with a set of self made earles forks gee it would be bucket legal)

The gearbox i see as a non issues as you guys remember there was a rather famous Bears bike that amongst other parts contained a Japanese gearbox.

So whoops bugger and i am a turkey who eats humble pie occasionally.

[ief]

Here is pic of case filling, and the CNC model used to machine the ducts to suit the new Boyesen tunnels.

Cheers Wob, I kind of did the same be it without cnc and more devcon, can't seem to find pics of it tho...