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Old 09-29-2003, 07:03 PM   #15
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1969 31' Sovereign
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Hmm....Good tip however, with 163,890 miles on the 1996 Vortec 350V8 with 324 GR it has just about seen it's day. 17/19 mpg on the road no tow, and 10/12 mpg towing depending on wind, speed ect.

Garry
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Old 09-29-2003, 07:07 PM   #16
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2004 25' Safari
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Garry,

I see your point!

Nearly fell out of my chair after readin it.

Guess you got you your money's worth out of it. My '80 Olds Delta 88 has about 167k on it. I just can't part with it. Darn thing burns no oil, body is dyin' but what the heck....it's a dumb car...the only computer in it is in the radio and even that is pis* poor. I just love tinkerin' with it.

Eric
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Old 09-29-2003, 07:09 PM   #17
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i run the lowest grade fuel that won't ping, knock, run on etc. that's 85/87 for me.

higher octane than needed is just blowing cash out the tailpipe.

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Old 09-29-2003, 07:10 PM   #18
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On mid grade understand the tanker truck does not come with three grades of fuel. It comes with two and the driver mixes the mid grade at the station. THis leaves some room for error. If the driver mixes right then no problem.

The only grades your guaranteed to be absolutly correct is regular and premium.

Friend works at a tank farm and told me that's how it's done.

Octane is the burn rate/ flash point. Basicly the higher the octane the SLOWER it flashes. This is why it helps with ping particulary in a higher compresion engine. It effectivly slows the burn and there for corrects for a lean mix or too far advanced timming. That keeps it from igniting too fast and causing the ping.

Here is a much better definition.
http://theserviceadvisor.com/octane.htm

Basicly you could tun the engine to run fine on regular and get close to the same performance. My take on it is the timing is advanced some. Old hot rodders trick ad yes if you bump the timing and run a higer octane it does work and make more power. Possibly inacurate timing marks on the engine and even though you did set the timing to factory spec the timing is actually advanced. It is not uncommon for GM harmonic ballancers to have the outer ring slip and it usualy slips to indicate lower then actual timming.

GM distributors are also prone to the mechanical advance hanging up (FI equiped vehicles do all the timing with the computer so no worry here). The distributor has a shaft within the main shaft. Vapors from the engine wil get between the two and coke up. This will prevent the mechanical advance from retading after being run at a higher RPM and it will cause a ping problem. Easy to correct if your not affraid to pull the distributor.

Another thing that does happen is carbon forms on the intake valves and pistons. When it forms on the intake valves it acts like a sponge as well as fouls up the air flow into the cylinder. Both will cause a lean problem. this can also cause a little bit of a run on problem because a lean mix has a lower flash point.

When carbon forms on the piston it can have hot spots that will ignite the fuel without spark. This is the usualy cause of run on especialy when coupled with a carboned up valve.

"Top end engine cleaner" from your local GM dealer. GREAT stuff and does clean carbon off valves and pistons quite well.
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Old 09-29-2003, 07:11 PM   #19
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John,

I totally agree, however, if you mess with the mix you gotta pay the piper. I have messed with it, so now, I gotta pay for the good stuff and at $2/gal all I can say is...

OWIE!!!!!!

Heck, you got the cash you could make a Buick run NASCAR.

Eric
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