[Diy_efi] Spark Plug readings

[Shannen Durphey]

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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