Octane Supreme (formerly Lead Supreme)

[@wot]

If you are building an engine that will run on 93 octane, you need to cc the heads. Otherwise, it really doesn't matter what the compression is. If the engine is detonating (you hear it or check for signs on the plugs), you need to make some tuning/fuel changes. If your engine is in sound shape, and you like the timing and distributor curve the way they are set, you need more octane to resist burning too quickly in an engine that detonates. You may get away with lower octane if you are not driving hard

I have not had real good results with boosters, and still mix racing fuel with 93. The ratio depends on the ambient temperature.

[Chevy454]

A rule of thumb? Keep a close eye on your plugs. I was never a fan of octane stuff in a can because it colored my plugs funny and made 'em hard to read. It's definitely better to err on the side of caution, though.

[mockingbird812]

[ QUOTE ]
If you are building an engine that will run on 93 octane, you need to cc the heads. Otherwise, it really doesn't matter what the compression is. If the engine is detonating (you hear it or check for signs on the plugs), you need to make some tuning/fuel changes. If your engine is in sound shape, and you like the timing and distributor curve the way they are set, you need more octane to resist burning too quickly in an engine that detonates. You may get away with lower octane if you are not driving hard

I have not had real good results with boosters, and still mix racing fuel with 93. The ratio depends on the ambient temperature.

[/ QUOTE ]

Dean - By saying the" The ratio depends on the ambient temperature", I am assuming that the hotter it is the more octane is required. Is that right?

What has been your poor results with boosters?

Rob - checking plugs is a good idea.

Thanks,

[@wot]

The hotter it is, the more likely my engine will detonate. Boosters have never eliminated the detonation problem, and as stated above, leave some strange deposits on the plugs. My theory on boosters is this:

Any additive used to raise the octane works on volume. A 16, 32, etc oz can of any booster can't effectively change 18 gallons of 93 to 102 octane.

[Chevy454]

Exactly, Dean...

[tirebird]

I've been using it for some time now. Before rebuilding the LS6 I used it in any tank of lousy California ethanol diluted 91 octane. I wouldn't use it when I filled up with 100 unleaded or 110 leaded at the local track. Now that I've rebuilt the LS6 with 9.5 c.r. heads/pistons, I don't use it that much. However, when I do throw a bottle in, even with the lower compression, my SOP feeling is the car is more responsive and powerful. But that's not science, just my impression.

[mockingbird812]

Just returned from AZ emissions station this a.m. with the subject car. I filled the tank prior to this with one quart OS 130 and the rest with 91 Octane gasoline. According to the Kemco chart my 18 gallon tank with 1 qt of OS130 shld net a 5 point octane rating gain or 96 octane. Car ran beautifully and strongly and I passed the emissions test loaded and at idle for HC and CO. Will monitor plugs and performance as the ambient temps increase. I don't put many miles on this car.

Thanks for your inputs.

[WILMASBOYL78]

[ QUOTE ]
Works for me. Try shutting down and rebooting...or clearing your cookies...

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Bruce, how about if I eat the cookies instead?? Tried it again and it works...

wilma

[mockingbird812]

[ QUOTE ]
[ QUOTE ]
Works for me. Try shutting down and rebooting...or clearing your cookies...

[/ QUOTE ]

Bruce, how about if I eat the cookies instead?? Tried it again and it works...

wilma

[/ QUOTE ]

So......how do those cookies taste washed down with your beer there?

[WILMASBOYL78]