Running Premium Gasoline in a 3.8 SSE - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-30-2004, 04:06 PM   #11
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as long as you're experiencing no KR on 87, anything higher won't help your engine at all.

hook up a scan tool, run a tank or two of 87, and see if you're getting any KR. if so, you've got some problems you need to deal with anyway...
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Old 09-30-2004, 06:37 PM   #12
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I've had a class that dealt with this. 93 octane actually has LESS internal energy than 87, and it takes more energy input to combust. So, 93 combusts just a little later with a little less power in an engine that can run fine on 87. In a SC engine, the higher resistance to combustion helps with knock, and the escess power comes from the higher amount of full and air input.
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Old 10-01-2004, 12:24 AM   #13
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-the previous two responses state it very well. From what I remember of my study on the subject, the higher octane fuels are always slower burning, and also somewhat harder to light. Some engine configurations require higher octane for safe operation.

The lower octane fuels burn faster, and are easier to light. -thus the peak cylinder pressure occurs earlier. -too early, for some engines.

So, for engines that can tolerate the faster burning fuel without "ping" (or ignition knock) you are buying "heat energy" for less money.

(-the octane levels are totally independent of the other additives) -and no, your engine won't "get addicted" to any certain octane, or other fuel qualities for that matter.

Granted, we all have had those moments when we feel like the darned cars we drive have human-like qualities, especially changing attitudes, but not quite yet,,,, I think,,
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Old 10-01-2004, 01:09 AM   #14
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nevermind
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Old 10-01-2004, 01:30 AM   #15
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This has got to be a re-run.... In fact many didn't live the first time


http://www.bonnevilleclub.com/forum/...er=asc&start=0

ken
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Old 10-02-2004, 12:07 AM   #16
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kennlee, thanks for the link to the older thread on virtually the same topic.

And after having read through that one, I'll have to say that Dr.Jay seems to have stated it all pretty well. (-and by the way, for those who seem to like such terms as "hotter fuel" and "colder fuel" then I hope they can understand that lower octane fuel is "hotter", and high octane is "colder.") Think about it: It ain't "rocket science." The whole main deal with increasing octane is to * L O W down the burn process.

To everyone: One of the things that so far I have enjoyed about this Bonneville Club Forum is that MOST of the people replying seem to honestly enjoy digging into the actual facts of the matter. Some interesting things happen to us when the true facts are revealed: The myths, voodoo magic, smoke&mirrors, baseless biased opinions, emotions, old-mechanics-tales (worse than "old wives tales"), personal preferences, etc. soon find their rightful place,,,,-as they quickly fade away into the sunset,,,

I'm not too sure what is meant by the "Nevermind" comment: -Is that like saying, "Hey Sucker, don't confuse me with the facts: My mind is already made up!"

To discuss and debate and share experiences with an open mind is good. We all can learn, benefit and grow in our knowledge and experience base.

On the other side of the coin, assumptions, snap decisions, prejudjices, bias, voodoo science, magic tricks, etc all has it'* place too. -it just happens to be a place that I'll not be spending my time.

Thanks to everyone who is doing an outstanding job of sharing "the good stuff" on the Bonneville Club. We should stick together.
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Old 10-02-2004, 12:10 AM   #17
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no, i had asked a stupid question which was answered in that link to the old thread so i just changed it
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Old 10-02-2004, 12:22 AM   #18
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NERV Understood. Thanks for the clarification !!

"HAPPY MOTORING"

-for some reason the thought comes to mind to share a signature motto I remember seeing somewhere, that seems to me to suit us "motor heads" quite well. It went something like this: "I can sleep in my car, but I can't drive a house to work."

(-MY KIND of priorities !! )
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