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Discussion Starter #1
Does anyone know if leaded gas will hurt our bikes? I have been thinking of running half 92 octane pump gas and half Av-gas or 115 octane "Trick" racing fuel, but both of these contain lead.
 

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The newer models that say Kleen on them have some sort of catalytic converter in the exhaust I think. But why would you want to run such an exotic mixture when regular ole 87 will actually produce more hp.
 

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swjohnsey is right. 87 will actually produce more hp for some reason. that has been my experience since i tested three tanks of diffrent grades on my bike. i like 87 better, maybe cuz its cheaper.<img src=icon_smile_approve.gif border=0 align=middle>
 

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Unless you crank the timing or up the compression, there's really no advantage or need for the higher octane. If there is a cat, the lead will burn it out in a heartbeat.

-gary
'02 6R
 

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Discussion Starter #5
quote:
The newer models that say Kleen on them have some sort of catalytic converter in the exhaust I think. But why would you want to run such an exotic mixture when regular ole 87 will actually produce more hp.
How do you figure 87 octane makes more HP? Chemically impossible. I would be carefull running that, right on the tank there is a label warning anything under 90 octane can damage the engine. If 92 is good enough then I will stick with that (only about 60 cents more a tank than 87 octane). I was just thinking the racing fuel would produce a little more oomph.
 

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There are at least two different methods of measuring octane, research and motor are the two used in the states. The number on the pump is actually an average of the two. To get the number they are talking about on the tank the rule of thumb is to add 4. So 87 is actually 91. The lower the octane the faster burning the fuel. So to get maximum power use the lowest octane fuel that does not cause pre-ignition.
 

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Here in Portugal there are two unleaded fuels: 95 and 98 octanes. The 98 is a "cleaner" gas, with less sulphur and other chemicals that make no good to the engine - more expensive, also. And in the stickers in the new bikes I've seen on the stands it recomends the use of "Premium fuel" (that is the 98 octanes), certainly because of the high compression rates... the 98 resists better to the compression without self-ignition. However, I've been told that the 95 actually burns faster... and it surely won't self-ignite on the zx6r compress ratios...

______________S_y_n_d___
 

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it is right, the lower the octane the higher the power...comes at a cost though...


the 2000-2002 ZX6R come with an incedibley high compression ratio of 12.8:1 and with that compression it is highly recommened you stick with 91+ unleaded especially if you use the lower octance and you experience detonation/pinging you are going to need a valve job soon if you don't switch back to the right octane....

WMRC Novice Racer #87

www.bcsportbikes.com/cgi-bin/bike.disp/37
 

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Again, I ride a '95 ZX-6R. It has slightly lower compression than the newer models. The owners manual calls for fuel with an anti-knock inder (that is the number posted on U.S. pumps) of 87. They say this is equivalent to a Research Octane Number of 91. I am not sure what the newer models call for but it will say in the owners manual.

Using a higher octane fuel than required will not result in additional hp. It will actually produce less hp and gas mileage. With that said I have to admit that I usually use the mid-grade gas
 

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quote:
The lower the octane the faster burning the fuel. So to get maximum power use the lowest octane fuel that does not cause pre-ignition.
Listen to this guy and you will win races.

Av gas and race fuel have the same myth/stigma as back pressure in exhaust.

If your bike doesn't ping, run 89, if it still doesn't ping, run 87.

Jason
 

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I actually read somewhere that Ricky Gadson said "the kawasaki's tend to run better/performance on lower octane fuel 87" I can't remember where I read that might have been the ZX12R board a long time ago. I think he was talking about stock Kaws.
 

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"octane" is the fuels ability to withstand high compresion without pre-mature detonation.

octane has nothing to do with HP.


my .02
 
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