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Author Topic:   How many guys in this class run pump gas?
modman
Dirt Administrator

Total posts: 40
posted March 24, 2000 05:58 PM
I know we used to mix the racing fuel and pump gas in our 10-1 motors we used to run, does anyone else do this?

69-er
Dirt Full Roller

Total posts: 39
posted March 24, 2000 09:48 PM
I used a 10% mix of toluene with 91 octane. Worked pretty good. I was tested once, however, and it tested to be about the same specific gravity as racing gas. Got to http://www.wauknet.com/douthitt/pumpgas.htm for a good article on pump gas.

Larry

Flatlander
Dirt Roller

Total posts: 19
posted March 24, 2000 10:42 PM
I run Av gas and high oct with a little marvel oil mixed at 10 -1 racing fuel just didn't seem to make a diff.

24ksi Racing
Dirt Roller

Total posts: 13
posted March 30, 2000 07:54 AM
The biggest misconception people have with racing fuel is that higher octane = more power. With a low compression motor, racing fuel can actually COST you power. The octane rating is a measurement of the fuel's ability to resist detonation (dieseling/pinging). Some of the additives in racing fuel that stop detonation accomplish this by slowing down the rate of burn. You don't want to get the octane higher than you actually need it.

For a flat top piston motor with low cc heads, you can play it safe by mixing pump gas with a little racing fuel. In a 5 gallon jug, if you start with 2 gallons of 110 octane fuel (like Turbo Blue or Unocal) and cut it with 3 gallons of premium 93, your octane rating will be near 100. A flat top motor will live all day long on this mix.

Hope it helps....

Bill
24ksi
www.chasinracin.com/racers/24ksiracing

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