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Mr 5 0 · 03-06-2002, 11:00 AM

Curtis:

Thanks for the informative octane info.

I've found that raising the initial timing from the factory stock 10 degrees to 12 -15 (depending on the engine condition & mods) is usually worth a good tenth of a second off the quarter-mile et, sometimes more and this little adjustment almost never fails to produce this result.

Using higher octane gas after this timing advance simply avoids potential problems with detonation and is easily worth the peace of mind.

It has nothing to do with gas company ads or anyone's misconceptions, just real-world track experience and buying a cushion of safety for your engine.

I don't care to experiement with how low an octane I can run or how cheap I can find some gas with my beloved 5.0

On my wife's bone-stock Mazda 2.0 with stock timing, I'm not so fussy. 87 octane is fine and I have no brand loyalty at all.

As I stated, I don't care about brands, Sunoco just happens to have the highest octane available in my area and I prefer to stay with that. Price is a minor consideration and for what it's worth, after 115,000 miles, my injectors are still clean and I've never had a deposit on the plugs or any gas-related hassles.

Works for me.

03-06-2002, 11:00 AM	#13
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	Octane opinions Curtis: Thanks for the informative octane info. I've found that raising the initial timing from the factory stock 10 degrees to 12 -15 (depending on the engine condition & mods) is usually worth a good tenth of a second off the quarter-mile et, sometimes more and this little adjustment almost never fails to produce this result. Using higher octane gas after this timing advance simply avoids potential problems with detonation and is easily worth the peace of mind. It has nothing to do with gas company ads or anyone's misconceptions, just real-world track experience and buying a cushion of safety for your engine. I don't care to experiement with how low an octane I can run or how cheap I can find some gas with my beloved 5.0 On my wife's bone-stock Mazda 2.0 with stock timing, I'm not so fussy. 87 octane is fine and I have no brand loyalty at all. As I stated, I don't care about brands, Sunoco just happens to have the highest octane available in my area and I prefer to stay with that. Price is a minor consideration and for what it's worth, after 115,000 miles, my injectors are still clean and I've never had a deposit on the plugs or any gas-related hassles. Works for me.