GP40X

iTrader: (10)

Real simple, the higher the octane rating, the colder the fuel and the less power it will make in a motor designed to run on regular 87 octane fuel with a set timing. Add 2 stroke oil makes the fuel colder as it dilutes the light ends and raises the octane somewhat.

Now using a high quality 2 stroke oil that allows you to use a higher ratio of gasoline to oil (32:1 vs 100:1) means the fuel with less oil will produce more power. In addition oxygenated fuels will make more power even at the higher octane rating.

The best thing about high octane oxygenated racing fuel is you can advance the timing and change the timing curve of your motor as well as raise the compression to make more power. You would be surprised hoe much more power you can make just by changing the timing but don't go too far. Burned pistons from detonation are no fun to change.

hpikillr

iTrader: (1)

higher octane will make ur motor have more HP thats all.. as 4 all the posters saying no.. well why dont guys at the drag strip run pump fuel.. guess it dont give them the ponies they need..

hotrod87

iTrader: (252)

They don't run pump fuel because it burns too fast. They run higher octane to slow down the burn. If they ran less timing they could run lower octane. Lower octane is like adding timing. Higher octane is like running less timing.

Hoese37

iTrader: (5)

There is so much FAIL in this post. No it wont give you more power if you just switch out octane ratings. The reason they dont run pump gas is for several reasons.

Number one is because pump gas will predetonate under that amount of advanced timing and compression ratios. Were talkin 13:1 - 19:1 CR. 92 pump gas is good to about 12.1:1. Running a motor on the lowest amount of octane without knocking will net the most gain. Octane is the resistance detonation. The more the octane, the less it wants to burn.

Number two is because raceing fuels are leaded gasoline. The Chevy 454 is a great example of how leaded gas affects an engine. In 1972 the engine made 450+hp on leaded pump gas. In 1973 when leaded fuel was phased out, it made about 290hp.