True, Hounddog, I don't think there is much of a difference at all, but with the way gas prices are going right now, I would run 89 or 87, but I can't with my nitrous, and you can't with your bike, since I am assuming it is 11:1, I think we both run premium. It all depends on your money situation. Just IMO

 

I agree wallstreet and yes, I run 11:1 and my bike will stand for nothing less than 91.

~HoundDog

 

I run 93 in mine

 

We had one station carrying 93 at one time, but they too switched to 91. Now you can run 87, 89, 91, 101, 111, and 114.


~HoundDog

 

93 Octane even when My Warrior was stock. Just doesnt get as much build up with anything lower. 93 All the way and I consider my bike to be worth alot more than .20 cents. Some of you guys with Raptors may not hehe.

 

I read a big tech article on Dirt wheels Mag website a while back about high octane.I tried to post it but I can't find it.It said that unless you are getting pings and knocks it is is not necessary.It said the fuel is not any cleaner,it's just higher octane to reduce valve chatter.Their was also a thing on my local news a while back about high octane.They said the same thing.
Any body that works on cars and reads Hi-Perf magazines know that the magazine will run the lowest octane possible on their engines.If they could get a blown 502 to run on 87(not at all likely) without detination they would.They try to get as pump freindly as they can.I'm sure same goes for ATV's.
Just my 2 cents.
James

 

thats it exactly. Run the lowest octain you can without pinging to make the most power. Pinging comes from the fuel burning combusting before the spark. If you run a higher octain then you slow the burn down and it doesnt ping. But by running the higher octain fuel in your bike, car, whatever, it will not clean it out any better. they say some higher fuels have more detergents and such..bah..i yet to see proof of it. When you get your Compresion ratio up higher, sure you should run the higher octain, i would expect pinging on a high Compression motor with 87 gas.

Point being, your bike will last no longer by running the higher octain fuel..

 

Hey, when in doubt ask a chemist right? Working as a student chemist at the EPA lab does have a few perks... A great library and research center for one. Here is the EPA's position on octane levels relating to combustion fuels:


"The knocking characteristics of fuel is expressed by an "octane number." This is an arbitrary scale on which heptanie is given the value 0 and isooctane is given the value 100. Fuel with an octane number of 86 has equivalent knocking characteristics to a mixture that is 86% isooctane, and 14% heptane. During the combustion of alkanes, alkylperoxide radicals are produced (ROO*), which react explosively in radical chain reactions -- this is the cause of knocking in engines. Anti-knock agents, such as tetraethyllead, can be added to fuel to control the concentration of free radicals during combustion. Catalytic converters destroy the byproducts of incomplete combustion, but are inactivated by lead-containing compounds; therefore, refining processes are used to produce fuels with a higher octane number, thus eliminating the need for brached and cyclic hydrocarbons, both of which have higher octane numbers. As and alternative to this expensive refining, methyl tert-butyl ether (MTBE) can be added to gasoline as an oxygenating compound, which improves teh octane number. MTBE has an octane number of 110.5. Tert-butyl alcohol is another antiknocking agent used as an alternative to lead-containing compounds." (Dr. D. McInnes 2003)

Head spinning yet? Hope this clears things a little. [img]i/expressions/face-icon-small-happy.gif[/img]

~HoundDog

 

Hey Hounddog, how's about saying that again, in ENGLISH this time>

 

Basically what he said is fuel burns too quick, causes knockng, & pinging, but addatives can be added which raise the octane level and stop the pinging & detonation from occuring! [img]i/expressions/face-icon-small-wink.gif[/img]