ESE's works engine tuner

[TZ350]

Good job Wob, glad to hear your efforts are going to get onto the track OK...... ... go the 2-Strokers

I have been playing on the dyno too and with something completely at the other end of the scale.

The Std Suzuki GP125 makes about 12rwhp (15 crank) this one fitted with a Honda RS125 pipe and no other modifications makes 14 on 96 oct pump gas.



We have always wanted to try 96 vis 100 Av gas. So with no other changes. Red line 96 and Blue line 100 Av Gas.

I think there might be something different about the burn rates, we will explore 96 or even 91 with tuning and compression adjustments in one of our engines some time soon.

[TZ350]

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[ief]

We have always wanted to try 96 vis 100 Av gas. So with no other changes. Red line 96 and Blue line 100 Av Gas.

I think there might be something different about the burn rates, we will explore 96 or even 91 with tuning and compression adjustments in one of our engines some time soon.

Isn't that the whole idear behind it, to prevent detonation. Not sure what you want to find out with this? When you are making serious power on say 96 and can't stop it detonating in spite of all clever solutions then it would be time to go up on the octane?

[wobbly]

The issue that your test doesn't address is that with pump gas you may be able to get away with 13:1 com.
With AvGas its just starting to work properly at 15:1 and this attribute will always far outweigh any advantage flame speed or whatever may be contributing from the pump gas scenario.

The other issue is that unleaded fuel works best with plenty of advance, no com, and rich as hell.
AvGas loves com, loves running lean and hates advance, so you need to spend days on the dyno just optimising for the fuel.
Much better things to be doing in making a fast reliable race engine I believe.

[F5 Dave]

TZ it may be as simple as calorific value of the two fuels. Either way until you are running in a race engine you don't learn much from testing fuels on a std engine.

Strangely back in the day my RG50 was running silly com ratios (I actually made an inadvertent mistake oil stoning my head every time it warped (as over skimmed RG heads like to). Turns out I was running 19:1 instead of the 17:1 I thought.

So back in the day the Eco fags finally got the guvermint to screw with our gas. Buckets had to run pump gas & the bike loved leaded pump gas. I tried the ULP that first came through & it would hardly pull (with that comm ratio). We then banded together to run Av Gas & the rules were changed, but on the same dyno session as above I tried Av & lost a hp with any mj or ign setting.

I tried 4 different head designs with altered comm & squish sizes/angles & never got it back. That was one engine & I'm not saying all engines.

[richban]

I think there might be something different about the burn rates, we will explore 96 or even 91 with tuning and compression adjustments in one of our engines some time soon.

I remember Kev telling me 98 has higher BTUs than Av but Detonation was the issue especially with compression. 98 Burns hot

[TZ350]

Thanks … some interesting ideas there.

Team ESE has stuck with AvGas mostly because we believed it would be more consistent than pump fuel which seems to change with the seasons.

And being the experimenters we are thought it appropriate to check out sometime what might be the best sort of fuel for making power in a 2-stroke. Fast burn less advance and negative pressure before TDC, that sort of thing.

[F5 Dave]

Hey I always believe in test, but often I get stuck in the rut of 'I tested it once' & not testing again.

Just think your test was on the wrong bike.

[husaberg]

Thanks … some interesting ideas there.

Team ESE has stuck with AvGas mostly because we believed it would be more consistent than pump fuel which seems to change with the seasons.

And being the experimenters we are thought it appropriate to check out sometime what might be the best sort of fuel for making power in a 2-stroke. Fast burn less advance and negative pressure before TDC, that sort of thing.

Robinsons book offers a nice little piece on optimising fuel, ignition and comp to suit different fuels using a variety of fuels, but i guess you already knew that
http://books.google.co.nz/books?id=8...0fuels&f=false

[Gigglebutton]

On a side note of fuels.
Can any one tell me where i can buy Acetone in Auckland and what % i should use in T2 mix?
Im using the Elf 909 that Wobbly had seperate on him and dont want my RG50 to sieze now its going again

[husaberg]

On a side note of fuels.
Can any one tell me where i can buy Acetone in Auckland and what % i should use in T2 mix?
Im using the Elf 909 that Wobbly had seperate on him and dont want my RG50 to sieze now its going again

The ..... rules allowed up to 5% Acetone (or was it 4%) to help the miscibility of some oils er... deleted rest......
If i was looking for it i would ask the Mobil fuels disributor they used to stock it other wise it is commonly sold as a nail polish remover so maybe try the chemist. They are a potential source of a lot of interesting fuels as are dry cleaners
Failing that i seem to remember acetone was used as a solvent for some therapeutic Hemp products. so ask the local police.

Oh yeah used a lot in the fiberglass industry as well.

Trademe has some not that cheap thoughhttp://www.trademe.co.nz/health-beau...-494580829.htm
http://www.trademe.co.nz/health-beau...-493825637.htm

[Farmaken]

Acetone is available at bunnings ( in the paint dept. )- good for cleaning up after fibreglassing

[Yow Ling]

http://www.tmkpackers.co.nz/index.ph...roduct/acetone

Husa IPA (Isopropyl alcohol) is used to make Hash

[husaberg]

http://www.tmkpackers.co.nz/index.ph...roduct/acetone

Husa IPA (Isopropyl alcohol) is used to make Hash

Not by everyone it's not. Have a google use the words Acetone and Hash

[Yow Ling]

Not by everyone it's not. Have a google use the words Acetone and Hash

MMM seems there is more than 3 ways to skin that cat, we only ever had IPA at work so thats how it was done when I was a lad