[Diy_efi] Spark Plug readings

[Bruce]

We need dem pectures.
Bruce

From: "Shannen Durphey" <shannen at grolen.com>
Subject: Re: [Diy_efi] Spark Plug readings
> I may be able to catch some pictures of a Mitsu engine with a little too
> much "octane reducer" sneaking past the turbo seals.  This particular v6
is
> missing about 30% of the top of #5 piston, and about 40% of the top of #4
> piston.  This happened in a *very* definitely rich calibration, in a car
> with good intercoolers and moderately low intake temps.  Funny, but the
> owner never reported hearing any detonation either.
> "I was cruising along at about 100, and I went to downshift, and it just
> died."
> Oh yeah, it's dead alright.
> Shannen

> Eric Fahlgren wrote:
> > r71chevy at earthlink.net wrote:
> > > I thought it reduced the CR.  My understanding was that it would
quench
> > > combustion & effectivly reduce the likelyhood of detonation, therefore
> > > reducing the CR & HP.  Maybe I have it backwards?
> > Those big, fat hydrocarbon chains in oil act as a very effective octane
> > reducer, since they are so easy to light.  This causes oil in the
mixture
> > to effectively "raise the CR," at least wrt detonation.



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