The Truth About Gasoline

[bluevp00]

Originally Posted by grego101

like put about 4oz to a tank of 87 octane. What will that do.

Absolutley nothing. It will raise the octane rating to about 87.3, which will have no effect on anything.

[BeteNoir]

Originally Posted by MishaA

Oh, yeah, and the second part, sorry
My take is that engine is tuned to run optimal ignition timing whenever possible - this is the only way to have highest possible power and highest possible efficiency simultaneously; and engine is designed so that optimal timing is pretty close to the detonation limit on full throttle – again, this is the only way to get maximum out of the given engine. Of course, recommended octane rating assumed.

Advancing the ignition timing to the edge of detonation does not produce best power. Altering the ignition advance under assorted condtions of throttle position, engine temperature, inlet pressure and mixture to position the combustion pressure peak at the proper crank angle is what will produce maximum performance.

Detonation is not determined by the flame front except if the flame front is slow. Detonation is the spontaneous combustion of the end gas volume prior to the arrival of the flame front. The very sudden combustion sends a high velocity shock wave across the cylinder which is measured in kilohertz. The pressure waves remove the protective boundary layer from the piston and head allowing metal to be eroded by the heat and pressure. Detonation always occurs after top dead center but very close to TDC.

[tommy d]

I agree with most! Octane is a money making tool! Since the advent of computer control systems on vehicles in the mid 80's, there is no need for high octane fuel!!!! Only if you are HIGH PERFORMANCE IE: compression, cams, gearing and so on! But even when I was tooling around in my 56 chevy 301 small block in 1969; I just put a couple of mothballs in my 14 gallon tank!!! You can still buy them anywhere! AH! Ketones and Acetones!! Burn the house down!!!!

[Markb873]

When I was 16 filled up my 1991 Geo Metro with 93 and put in 4 bottles of Turbo 108. The car had a hard time starting with that tank of gas.

-Mark

[sales-autodiag]

all right