Gas Mixture Question

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Aug 11, 2006 | 04:59 AM

#11

Tpsycho

Pro Rider
My Bomb Busa is done now and WOW what a rush this thing is scary fast. I love it

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Gas Mixture Question

radejr You should read up on your fuels and fuel properties before you start calling people liers.
Take some time and read up on octane and you will come back and apoligise to these guys for trying to help you out. I have done extensive reading on octane and it's properties and these guys are correct.

Aug 11, 2006 | 11:18 AM

#12

Red400EXRod

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From: Snohomish, Washington

Gas Mixture Question

Quote:

Originally posted by: radejr
Whatever you guys say. I know your wrong. Just riding someones back because you know them.

Ask anyone at the race track. Higher Octane will burn hotter. It will burn faster because it cannot burn it all it will shoot some of it out the exhaust.

I am done argueing and I have already talked to 3 people prior to this topic all are racers and know their fuel and told me the same thing.

Ignorance is bliss!

Aug 14, 2006 | 07:22 PM

#13

chenoweth122

Range Rover

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Gas Mixture Question

to radefr!!

i don't know where you race, but any normal rider or recer will tell you that high octane burns cooler. do the reserch yourself!!! you can find websites all over the internet that will tell you the exact brake down. my thoughts, don't run your mouth and talk smack to other people if you do not know what you are talking about

Aug 15, 2006 | 10:09 AM

#14

Scooter86

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Gas Mixture Question

Quote:

Originally posted by: hondabuster

Quote:

Octane has very little to do with the combustion temperature. Jetting (the proper air/fuel ratio), has more effect than octane by a large margin.
Race motors generally have very high compression ratios...hence the need for high octane to tame the preignition.
In MN, we dont have much choices for gas...its almost all blended with 10 ethenol, and alcohol has a much lower btu content than gasoline, so the net effect is leaner mixtures. Ask anyone who runs alky in the motor...and they will tell you about HUGE jets, and if its jetted corectly, itll run the same temperatures as a gas motor.

hondabuster is giving you true scoop. Higher octane fuels burn slower and actually have less power per unit then something with a lower octane rating. It has to be used to fight pre-ignition in higher compression engines though. Lower octane fuel can actually start to burn before the engine wants/needs it to. Since race engines are tuned to move larger amounts of air and fuel, they compensate for the lower BTU/higher octane fuel by burning a greater amount of it. I also agree that jetting has way more effect on engine operating temps. If any of you have ever run nitro RC cars, you can vouch for the fact that the best way to tune a nitro cars' carb is to (GASP!) take temp readings of the engine! To lean on the adjustment the engine runs hot, add more fuel into the ratio and it runs cooler.

radejr, the short answer to your question is just run the 86 or 87 octane fuel. Chances are very good it already has 5 or 10% ethanol in it at the pump(every thing around my area does.) If anything, you are loosing power running higher octane fuel, although the power differances on your 229cc, mildly tuned, shaft driven Honda are not noticeable to any butt dyno. Any power or performance gains you may have felt were all, uh, in your head.