[Diy_efi] Spark Plug readings

[Shannen Durphey]

Remind me inna few days.  I'll be at the track with some antique racers for
the next couple.

Oh, and there will be some old cars there, too. ; )

Shannen

Bruce wrote:
> 
> 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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