ESE's works engine tuner

[TZ350]

Not everyone has a lathe in the dynoroom.

Attachment 247993

Not every one has a natural gas tubocharged V8 Cat powered 1,200 m3/hour CNG compressor in the dyno room either. These beasts get shipped from New Zealand to all around the world.

... so did you find the best ignition timing for each CR? it can change quite a bit for each head shape (although power can stay the same -can not will).

Yes... roughly optimized for each CR change, but there was not much in it. Like you, I have found that bigger changes are required with different head shapes. Mine with its dished piston and tight squish is about 14 and the open chamber engines we run are about 26 deg BTDC.

... A change in baffle cone may affect your 'sweet CR spot'

Agreed, more of a supercharging/plugging effect from the pipe will require a lower CR.

I thought it was hard enough with just ignition and jetting, and now compression, to many variables to lay out in a matrix and work through one by one, so I have to take intuitive steps and hope the guesses go in the right direction.

[F5 Dave]

. . .
I thought it was hard enough with just ignition and jetting, and now compression, to many variables to lay out in a matrix and work through one by one, so I have to take intuitive steps and hope the guesses go in the right direction.

Tell me about it, back to the dyno tonight having made some changes that MUST be better; only to find a bunch of missing power & after going in circles will have to go back tail between legs to the original set up & see if indeed steel reeds are better than the two thickness's of CF I have trialled. . . or that I have lost power elsewhere & in between am trialling every combo of ign & jet size find what that is. To make it worse the starter doesn't work so I have to pull the bike off the dyno bump it & reattach for every run. Joy.

[ac3_snow]

Re the floating crank,in all the race engines I have done the RV floats on a boss thus any movement of the crank has no effect.

Pardon my ignorance, could you please explain this for me in laymans terms?

[TZ350]

Tell me about it, back to the dyno tonight having made some changes that MUST be better; only to find a bunch of missing power.

Yep I have often taken a bunch of power and made it into a much smaller offering before getting it right.

[TZ350]

Made a small adapter plate tonight to fit the pumper carb hard up against the case, can't get any shorter than that. Also set the pop off to 10psi. That lever and dam spring is sure fiddly and now to figure out how to connect the throttle cable as it now pulls in the wrong direction??????

[husaberg]

and now to figure out how to connect the throttle cable as it now pulls in the wrong direction??????

Should be a good may to decrease lap time as you will have to forcibly roll the throttle off to slow down.I think you could disable the brakes to at the same time as they only slow you down probably no good on a race bike anyway.
Not a bad site here, with some interesting stuff. It was the naughty boy racing site.

http://www.speeddemonracing.com/articles.html

[koba]

Made a small adapter plate tonight to fit the pumper carb hard up against the case, can't get any shorter than that.

No float bowl to froth up with the solid mounting too!

[bucketracer]

..... I think you could disable the brakes to at the same time as they only slow you down probably no good on a race bike anyway.

I have seen TeeZee ride a bike to a good finish in the wet after crashing and breaking the front break lever right off.

[husaberg]

I have seen TeeZee ride a bike to a good finish in the wet after crashing and breaking the front break lever right off.

I remember a story of a GP rider 250 I think who broke his right wrist.
Well that buggered him up for racing so he got the mechanics to swap over the the brake and throttle over so he could still ride and hopefully salvage some points.
He lasted one or two laps until he applied the clutch (now Front brake) during a full throttle shift in practice. He then decided maybe it would be better to wait till the cast was off.
I think Schwantz just used to rip the cast off and ride anyway.

RE the front brake a little trick is to put a plastic sleeve under the clamp so in the event of a crash the brake assembly can pivot a bit.
Another is to have the lever well inside the length of the clip-on's as well overlooked on quite a few bikes some people also drill just bellow the ball as a sacrificial bit to snap rather than further down the lever. To finish first first you have to finish I guess.

[bucketracer]

When I was helping Thomas with measuring air flow through different carbs and looking for ways to improve them he showed me that it was much easier to get good flow with a small step < 1mm between carb and manifold than you usually could by trying to get a perfectly good match.

Attachment 248015

The flow with a small step and the best match we could make was the same, a slightly imperfect, perfect match flowed noticeably less air than a definite small step did.

Attachment 248014

TeeZees carb with a small even 0.5mm step all around the edge will make it easy to take off and refit without loosing any air flow at the joint through any slight miss alignment.

[husaberg]

If you hand me the text in Swedish I might be able to translate it to something more useful

Luftbox till förgasare

Specialtillverkad luftbox med över och underdel som bildar botten mot förgasaren.
Boxen är kanon till slidmatade motorer eller crosshojar där man vill ha filtret på ett mer skyddat ställe utan att förstöra varken motorkarakterestik eller körning.




Mikuni Powerjet PRO
MEG-024 med elektrisk styrning


Universalkit för alla typer av förgasare. Kitet är till för att ge extra bränsle under accelaration då det behövs som mest med bränsle. Det här kitet är det som topptrimmarna använder tillsammans med programeringsenheten till tändboxen eller liknande. Den aktiveras då pipan börjar dra för att stänga av då man har paserat max vridmoment. Därefter behöver motorn gå magrare igen.

En annan användbar arbetsplats för den här magnetventilen är att använda den på lustgasaplikationer. Då kan man placera den mellan trotteln och insuget. Ventilen kan då ge motorn extra bränsle vid avslaget då resterande lustgasmängden läcker in i motorn efter avstägningsventilen till lustgasen. Annars är risken för haverier överhängande på grund av uttorkning av cylinderväggar och lager.

Powerjet munstycket måste alltid beställas separat av kunden.

Beställningsnummer MICPJ 30 upp till 100 Du hittar munstyckena på ett annat ställe här på sidan.

Thanks for the offer most appreciated.
I struggle enough with Engerish.

[Buckets4Me]

just heard that one of the test riders for team E.S.E is off to japan



" He will be riding a Suzuki GSX-R600 for the Yoshimura R&D Team "

" Following informal discussions with Yoshimura Japan’s President, Fujio Yoshimura, Jaden has been offered a test opportunity in the 600cc Super-Sport class, a round of the National Japanese Championship. His recommendation came from New Zealand’s own 2 times World Champion Graeme Crosby "

" A bonus for Jaden will be the chance to ride a Yoshimura Suzuki GSX-R1000 WSB - World Super Bike. "


http://brm.co.nz/articles/hassan-to-race-in-japan.html

[teriks]

Some odd Swedish there as well, I'll give it a try..

Luftbox till förgasare

Specialtillverkad luftbox med över och underdel som bildar botten mot förgasaren.

"Specially made air-box consisting of an upper and lover part, forming a bottom against the carb"
Now, I dont understand that "forming a bottom against the carb"-bit myself..

Boxen är kanon till slidmatade motorer eller crosshojar där man vill ha filtret på ett mer skyddat ställe utan att förstöra varken motorkarakterestik eller körning.

Anyway, it's intended for disc valved engines, where you want to move the air filter to some more protected location. Then there is a part about the air-box not ruining engine characteristics or drive-ability something.

I'll get the rest when not at work..

[cotswold]

Google translated it as


Custom made luftbox over and bottom forming the bottom of the carburetor.
The box is great for slidmatade engines or motocross bikes where you want the filter to a more protected place without destroying either motorkarakterestik or driving.




Mikuni Powerjet PRO
MEG-024 with electrical control


Universalkit for all types of carburetors. The kit is designed to provide extra fuel during accelaration when you need it most with fuel. This kit is what topptrimmarna use with the programming device to the ignition box or the like. It is activated when the barrel starts to pull that off when you have Pasera max torque. Then have the engine run leaner again.

Another useful work for this solenoid valve is to use it on lustgasaplikationer. Then you can place it between the throttle and intake manifold. The valve can then give the engine extra fuel for the refusal when the remaining amount of nitrous oxide leaks into the engine after avstägningsventilen to nitrous oxide. Otherwise, the risk of accidents imminent due to dehydration of the cylinder walls and bearings.

Powerjet nozzle must be ordered separately by the customer.

Order Number MICPJ 30 up to 100 nozzles can be found elsewhere on this site.

[wobbly]

Re the PV and floating cranks.
All the engines I have worked on with a RV, the valve has a boss in the centre.
This boss slides on crank splines to give the correct rotational alignment, and also allows the blade to float in the gap between the case and cover.
Thus allowing the crank to float the recommended 0.2 to 0.3mm on the mains, has no effect on RV alignment.
Here is pic of a RV splined boss