no, it does NOT. chances are the car is setup for higher octane fuels. highier octane fuel doesnt equate for more power, but it can seem that way if you weren't running the right octane to begin with. stock O2 sensors can be damaged by high octanes such as race fuels.

 

Just get some methanol and rejet your carb. It almost doubles your HP. We did that on our stock GoKart with Briggs 5HP engine and got it up to 10HP and 40 MPH with stock gearing!

 

If a Briggs lawnmower engine can handle it with NO problems whatsoever, I'm sure a 400EX can handle it. The only thing is it burns the methanol up really fast. You can only get about 4 miles flat out on one tank on the GoKart.

 

I used to do the same thing...........
I dumped a whole bottle in there one night when I was drunk (not driving anything)

and I didn't realize it until the next day when I rode it........I could tell a difference.....
and to all of the people that say it doesn't make a diffference?...IT DOES........It very well could have been cause I was running it lean already.......and that higher octane made it run like it was supposed to?
but I could tell a difference........

I jetted it right and never did it again.......in fear that I would burn it up.....LoL

 

i no it does and HA2 can say what he wants, but to a point he is rite its not the octane makin power, its the more volitile fuel from the hexane and tolulene in the octane booster that makes it explode harder thus a more volitile explosion in the combustion chamber and a chain reaction to more torque twistin the crank . and ha2 we run claimer cars and the motors aren't anything special just cast piston stock replacement pistons off the shelf holley carb and a mild cam. when u really dose up the fuel it burns hotter and FASTER turning the crank faster thus makin power but hotter can burn a hole in piston quite a few burnt ones in my shop from 400 sb chevys 2-3 races and we put new ones in

 

so if i shaved my head 20 mm on my lt250r and ran 110 octane will i fell a difference or will it be point less and ill have a burnt up piston?????

 

wouldnt the highier octane make it run cooler? its my understanding that highier octane has a higher flash point then lower octane fuels. this all goes in hand with ignition timing which is over my head a mile. [img]i/expressions/face-icon-small-confused.gif[/img]

 

u got to understand that we are really doseing the fuel up. a bottle that supposed to treat 16-20 gallons in 4 gallons. we're not try'n to raise the octane , just make the fuel more volitile. kinda like the difference between a firecracker and a stick of dynomite going off in your combustion chamber. which one will turn the crank harder? the higher the octane, in a real world example, the SLOWER and more complete the fuel burns creating a little more pressure do to the slower and more complete burn expanding longer and a little more in ur combustion chamber. so i guees it would be a little cooler from the slower burn, but we not following the manufacturers recomendations and really makin sum hot fuel here....and timing has a lot to do witk it........cant have the timing to far before top dead center or its so hot it trys to push the piston back down before top dead center..i.e tries to turn motor backwards on that 1 cylynder and will bend and break rods...have a few of them to. we time these cars at zero (at top dead center) to stop this in alot of cases i've seen people actually make it spark after top dead center by a few degrees to make sur its not try'n to twist crank wrong way

 

so do you guys advance the timing of the spark to create more compression? we all know that lower octane fuels will full ignite when compressed too high hence the reason for higher octanes. note that i am not a 100% sure in what i just said. [img]i/expressions/face-icon-small-smile.gif[/img]

 

nope we retard the ignition, advancing it puts spark befoere top dead center...bad in theses cars, cause with fuel so volitile it will try to push the piston backwards as it hasn't reached the top and if the fuel lites off b4 this it tries to send piston back down b4 its through with its stroke....so we retard ignition to near or after zero TDC to keep this from happening. timing has very little if any to do with compression. again in real world street cars it is advanced so that the fuel is at full combustion once it reaches the top thus pushing the piston back down at full burn this is possible and ideal as pump gas isn't as volitile and after it is lit it can still turn a few degrees i.e.(stock small block chevy sparks 34 degrees be4 the piston get to TDC so it is actually compressing burning fuel for 34 degrees of crank rotation) to get to top of cylinder. the fuel we run flashes so quick it can't light off bfore the piston reaches the top or it will send the piston down b4 its got all the way to the top ...actually turn that cylinder backwards bending your connecting rod. we have to keep a stock compression ratio...so thats why we run such hot fuel to create more pressure in the cylinder