ESE's works engine tuner

[Kickaha]

Said it earlier when this problem came up - use Cone lock nuts. Do try it.....

Example - A sidecar outfit rear brake disc was continually coming loose with Nylocks on the retaining screws.

Cone locks fixed it.

Nylon melts, metal doesn't, not at those temperatures anyway, I always used cone locks on the LCR brakes If you want to be extra wanky use JetNuts/Kaynuts, they have a reduced hex size compared to others, expensive though

[Condyn]

Are there any rules on transfer window minimum bridge width with iron lined cylinders? I have had success going to 2mm on 70mm bore cyls, but with nikasil. I would hate to hit the point of no return on the 99th hour of these hooers.

[TZ350]

Drill it out and you may find the cross drill is 3.2mm or something silly. Then plug again checking that doesn't impede flow. I use a bolt cut down to 'not much', and Devcon. View down inlet to check.

Yep 3,3mm.



I have now drilled it all out to 6mm including the brass fuel barb. The delivery fuel line is 8mm id.

[F5 Dave]

Was just a guess. No need for it to be any bigger said the engineers to themselves considering the target audience of these carbs. Like it's not likely they will be fitted to something that does less than 15km per litre!

[Strokerhaus]

Hi TZ

I'm also trying to run 40+ rwhp on an aircooled single, but running on Avgas. So yes I do have temperature related power drop off, plus like you a cylinder bolt torque drop off.

I did work with my old friend the late Ron Gardner on Speedway bikes, and we could run the Gardner's (Lake, Lectron, Star, Posa, etc are all copies) without float chamber not recommended for anything other than speedway or high flow Gardner float chambers. The chambers are still available if required.

As for cylinder bolt torque drop off, I'm running M8 bolts which are right on, or in fact slight over their stress limit. I really should go one size up but currently lack the room.

Keep up the good work.

[Frits Overmars]

It is Saturday, June 3 in Thailand

[Grumph]

Hi TZ

I'm also trying to run 40+ rwhp on an aircooled single, but running on Avgas. So yes I do have temperature related power drop off, plus like you a cylinder bolt torque drop off.

I did work with my old friend the late Ron Gardner on Speedway bikes, and we could run the Gardner's (Lake, Lectron, Star, Posa, etc are all copies) without float chamber not recommended for anything other than speedway or high flow Gardner float chambers. The chambers are still available if required.

As for cylinder bolt torque drop off, I'm running M8 bolts which are right on, or in fact slight over their stress limit. I really should go one size up but currently lack the room.

Keep up the good work.

What's your brand of problem ? There are to my knowledge (besides Rob's Kawasaki) people on here trying to extract unfeasible HP from aircooled Bultacos, Maicos and in my case AJS Stormer.

[Flettner]

Electronic injection on E85, is the answer. Who cares what the question was😁. Great for air cooled engines.

[wobbly]

Same question as why put a turbo on a Beetle.
TeeZee the bits are on the way to ESE , the carb as well , couldn't be arsed disassembling it.

[F5 Dave]

Same question as why put a turbo on a Beetle.
. .

Because with any luck you will destroy it?
(Ducks for cover as the vdub fans rise and make farty noises in protest)

[TZ350]

TeeZee the bits are on the way to ESE , the carb as well , couldn't be arsed disassembling it.

Thanks, very much appreciated.

Electronic injection on E85, Great for air cooled engines.

Electronic fuel injection would most definitely be 100% my choice for methanol but the class rules specifically forbid EFI for pre 72.

[TZ350]

Hi TZ I'm also trying to run 40+ rwhp on an aircooled single, but running on Avgas. So yes I do have temperature related power drop off, plus like you a cylinder bolt torque drop off.

There are to my knowledge (besides Rob's Kawasaki) people on here trying to extract unfeasible HP from aircooled Bultacos, Maicos and in my case AJS Stormer.

From my Bucket experience with Suzuki GP125's 22 rwhp seemed the upper limit for consistent power on the track. Any more and the air cooling could not cope. I have thought of looking at using a small peristaltic pump to inject water and or emulsifying water with the fuel.

Injecting water really appeals to me because the Ignitec ignition can turn on a power jet or peristaltic pump at whatever rpm you like. So you could inject water into the inlet when the engine needs it most.

With 90% Methanol plus 10% Acetone and Caster927 oil 30:1 I can mix in 2,5% water easily and 5% if I leave it over night for the cloudiness to clear.



I have tried mixing water directly with the fuel before but other pump fuel or Av gas and oils did not like the water but I might try again using 10% Acetone and Caster927. Easy to mix small batches for experimenting.

I researched a lot about hydrophilic and hydrophobic and various approaches to make them more cooperative.

[F5 Dave]

Um. .. in what rulebook will that not be classed as water cooling?

[Flettner]

There would be no rule against mechanical injection? After all Hillborn have been around way before 1972. With sneaky electronic control of the bypass jet..... perhaps.

[husaberg]

There would be no rule against mechanical injection? After all Hillborn have been around way before 1972. With sneaky electronic control of the bypass jet..... perhaps.

With the rules from memory you have to prove it was in use on that sort of bike in the period the onus is on the person to prove eligibility or similar. buckets its open of course, but no alcomohol for them anymore.

(A) Pre 72 which shall consist of machines manufactured after January
1st 1963 and before October 30th 1972.
(B) Pre 82 which will consist of machines manufactured after the
closing date of the Period 1972 class and before December
31st 1982.
(C) Pre 89 which will consist of machines manufactured after the
closing date of the period 1982 class and before December
31st 1989.
(D) Pre 95 which will consist of machines manufactured after the
closing date of the period 1989 class and before December
31st 1995

Major Components:
Major components are: Frame (including Swingarm), Engine and Gearbox
castings, carburettors, Brakes (excluding front and rear master cylinders
which are open) and forks. These are to be manufactured between Jan 1st
1963 and December 31st 1995. Major components manufactured in any
country shall be acceptable. The onus of proof of eligibility shall rest wholly
upon the rider or entrant of the machine.
Modifications to major components are allowed, providing that such
modifications are visually indistinguishable from modifications proven to
have been used during this period. The onus of proof rests with the entrant
or rider of the machine

pre 72

17.3f Fuel Induction:
Fuel induction must be by way of period style carburettor of slide or
diaphragm type.
All carburettors are to be of square or round slide type, except for Gardner flat
slide carburettors. All flat side carburettors are otherwise banned. (Onus of
proof is on competitor rider or entrant of the machine).
Turbo and supercharging shall not be allowed.

that said it completely possible someone tried hillborne injection on a flat tracker in that period.
it was first used in 1949.
Last serious circuit bike i can remember using them was the 851 based BMS.
pretty sure the speedway and top fuel dragster still use it or similar.
watching the Nascar videos from the crew chiefs back in the day it looks like Nitros was a period mod for qualifying they just used to keep changing where they hid it.

PS happy birthday Jan thanks for sharing all your knowledge.