racing fuel

YJscott

Well-Known Member
Joined
Jan 13, 2006
Location
Charlotte
at petro express they have that 100 racing fuel. i know its cleaner than regular, but what would be the advantage and is it worth the 4.99$ a gallon
 
well, you can run a higher compression ratio in the motor and you won't experiance pinging. so you can get more horse power of the engine.
 
Octane rating has to do with compression. If your engine doesn't have the compression ratio to take advantage of the fuel, then you're wasting your money.
 
Reed said:
It depends, if you have a built engine, it'd run faster. If you have a stock engine, you'd destroy it
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No, it wouldn't hurt a thing.

All the higher octane means is that it doesn't ignite as easily as lower octane.

This is so higher compression can be used.

Compression is the ratio between the volume of the cylinder at the bottom of the stroke versus the volume at the top.

There are always "X" number of heat units in the air the cylinder has sucked in when the piston is at the bottom. Then, the piston squeezes them all together at the top. If there are too many, or the fuel is too easily ignited, the explosion we call combustion will occur too soon, before the plug fires...this is called detonation or spark knock.

The tighter you squeeze those heat units together, the hotter the mixture will get...friction. So you use fuel that won't ignite as easily and gets a more controlled burn.
Timing is also an issue...you can bump up the timing on an engine and create a need for higher octane by firing the plug earlier.

Most engines today are designed specifically for a certain octane fuel, and how that fuel burns. So using a higher octane won't physically harm the engine, but won't help...and in fact, if the octane is high enough, it will probably hurt the horsepower and cause driveability symptoms.

So the moral of this thread is, unless you have a hot engine that has better than 10-1 compression, using that 100 octane gas will only waste money.
 
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