[Diy_efi] Spark Plug readings

[Eck, Joel]

OK, My understanding was that when oil occupies space (volume) normally =
reserved for air or other more compressible vapors, it would increase =
CR, due to the fact that liquids don't compress as well as gases - just =
like reducing the volume of the chamber with metal increases CR. Of =
course, my stance doesn't involve the combustibility of the oil...

I'm sure someone will step in to set us straight... :)

Joel

-----Original Message-----
From: r71chevy at earthlink.net [mailto:r71chevy at earthlink.net]
Sent: Tuesday, July 30, 2002 11:01 AM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] Spark Plug readings


I thought it reduced the CR.  My understanding was that it would quench
combustion & effectivly reduce the likelyhood of detonation, therefore=20
reducing the CR & HP.  Maybe I have it backwards?

BW

On Tue, 30 Jul 2002 10:17:40 -0500 "Eck, Joel" <Joel.Eck at hp.com> wrote:

I, too, see the shiny brown glaze on what was, when new, a flat white =
ceramic
insulator. and there is some oil on the plugs. you do know that the =
presence
of oil in the chamber artifically 'raises' the CR, right?

as far as 'bits of piston' on the plugs goes, I don't see it, except for =
a
slight lump on one of the electrodes, but I can believe it was =
anti-seize.

I had a roommate one time with a 5.0, and he had problems with oil in #1 =
and
#8, I don't remember for sure, but I believe he said he fixed it by =
replacing
the intake gaskets.

-----Original Message-----
From: Brian Renegar [mailto:thomas.renegar at nist.gov]
Sent: Tuesday, July 30, 2002 8:41 AM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Spark Plug readings


Yes I know not all detonation is audible.  The kinds that you are =
talking=20
about would be though.  It's obvious now that you are seeing effects of =
the=20
camera flash.  There was some anti-seeze on the plug and that =
accidentally=20
got on the electrode when removing it from the engine.  The flash=20
accentuates the silver making it look like (to you anyways) that my =
engine=20
is falling apart.  After wiping it off, the electrode was perfect.


>Not all detonation is audible.
>So you see only *extended* detonation as a problem?.
>If your not open to at least trying to understand the answers to the
>guestions you ask, why bother asking them?.
>Remind me, in the future not to waste the time and bandwidth to try and
>answer your posts.

Don't know why your responses are almost always accompanied by an =
attitude.


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