Avgas?

[sharky]

G'day, I'm thinking about trying Avgas in my ZXR400. Have been trying to do a bit of research about it but have been finding contradicting answers. Would it make much difference/cause damage etc. Engine is standard (as far as I know)? Or should I just stick with pump gas? Anyone run it in a similar bike?
Cheers.

[rustys]

Sharky, I race the same bike 1989 model, with stock engine. Have run 50/50 mix of 91 and avgas in the past, but never found any noticable difference. So to save the hassles i just stick to 91. Others may have a different view, cheers.

[Skunk]

If the engine is std you're best with the octane rating it was designed for. Avgas is a slower burning fuel that's only any better in high compression engines. As it burns slower it's more resistant to denotation. I use it in my Bucket as it runs 15:1 compression and I was told to by the expert that built it.

[svr]

You run the minumum octane your engine can run on without detonating (pre-igniting, pinking). It's not a nice noise and is hard to miss. If it's not doing this you're fine with 91 I guess.
Time for some compression work would be my advice!

[t3mp0r4ry nzr]

engine may run a little cooler so there may be reduction in friction, but there would be no seat of the pants difference in power.

AVgas also spoils quicker than pump-gas.

Also, under F3 regulations, avgas is prohibited. pump gas is the only option with a 98 RON as max octane rating allowable (it was good to see MNZ testing the gas of the top-runners at puke in the F3 class).

I wouldnt bother myself. The only reason to run it is for safety. But if jetting is lean, put bigger jets in. If running hot, get cooling fixed or improved.

fair question tho

[GSVR]

You run the minumum octane your engine can run on without detonating (pre-igniting, pinking). It's not a nice noise and is hard to miss. If it's not doing this you're fine with 91 I guess.
Time for some compression work would be my advice!

Yes this would be a good way of weeding out worked engines in a Production Class. EG Standard SVs run fine on 91 so supply everyone with 91 enforce its use and if their bike don't run on it bang.

[SARGE]

If the engine is std you're best with the octane rating it was designed for. Avgas is a slower burning fuel that's only any better in high compression engines. As it burns slower it's more resistant to denotation.

chuck a bit of Acetone to it though and that sorts it out though


but yea .. save your money unless its modded with high compression

[GSVR]

Also, under F3 regulations, avgas is prohibited. pump gas is the only option with a 98 RON as max octane rating allowable (it was good to see MNZ testing the gas of the top-runners at puke in the F3 class).

So you haven't read or understand the rules. This is pretty typical of most F3 riders so don't feel bad.

[t3mp0r4ry nzr]

So you haven't read or understand the rules. This is pretty typical of most F3 riders so don't feel bad.

How about you enlighten us idiots then - oh wise one - instead of insulting over the internet

[GSVR]

How about you enlighten us idiots then - oh wise one - instead of insulting over the internet

Why don't you read your rulebook! Hell I may be wrong I have been in the past.

Sorry you took it as an insult. I did say don't feel bad... As for insults I'm insulted that you are insulted by the fact I'm pointing out to you that you can run avgas.

[codgyoleracer]

G'day, I'm thinking about trying Avgas in my ZXR400. Have been trying to do a bit of research about it but have been finding contradicting answers. Would it make much difference/cause damage etc. Engine is standard (as far as I know)? Or should I just stick with pump gas? Anyone run it in a similar bike?
Cheers.

With compression (higher) & ignition changes you might see a gain (but it will be small). It mainly provides a bit more detonation protection.
Running AVGAS is legal - running highly oxygenated fuels I.E ELF racegas style - is not legal.

[t3mp0r4ry nzr]

Sorry you took it as an insult. I did say don't feel bad... As for insults I'm insulted that you are insulted by the fact I'm pointing out to you that you can run avgas.

My bad, was thinking of pro-twins fuel regs.

To be fair though, you didnt say that you couldnt run avgas, you made the point to say that the rules havent been read or understood. The implication is that I (and other f3'ers), are ignorant or to simple to comprehend the rules, where in fact, I was just qouting the wrong regulation. You should know that its not what you say that is important but the way you say it.

[GSVR]

My bad, was thinking of pro-twins fuel regs.

To be fair though, you didnt say that you couldnt run avgas, you made the point to say that the rules havent been read or understood. The implication is that I (and other f3'ers), are ignorant or to simple to comprehend the rules, where in fact, I was just qouting the wrong regulation. You should know that its not what you say that is important but the way you say it.

Well Kyle I thought you knew me better than that. And I have been on a bit of a crusade about making the F3 rules clearer since I started racing and couldn't understand them only to find every F3 racer I asked had a different idea about what they meant.

See you at the track again soon as theres something I want to ask you about the ProTwin bike you used to own.

[t3mp0r4ry nzr]

Well Kyle I thought you knew me better than that. And I have been on a bit of a crusade about making the F3 rules clearer since I started racing and couldn't understand them only to find every F3 racer I asked had a different idea about what they meant.

See you at the track again soon as theres something I want to ask you about the ProTwin bike you used to own.

sweet as Gary. If this has highlighted one thing, it is the odd nature of the F3rules and this is something I agree with you on. I do agree that there is an open interpretation on these rules and the problem is, what interpretation is correct.

[wharfy]

sweet as Gary. If this has highlighted one thing, it is the odd nature of the F3rules and this is something I agree with you on. I do agree that there is an open interpretation on these rules and the problem is, what interpretation is correct.

That's what lawyers are for !!