Re: RE:RE: Updated PING report

From: Rimfax (Rimfax@email.msn.com)
Date: Thu Jan 27 2000 - 09:57:18 EST


Mike Good Stuff thanks!

I am as confused as the next guy.

> Possible Answers:
>
> 1. When the air is cold, it is denser. A denser air charge will require
> more fuel so the mixture might be richer. The reverse is true when the
air
> is hot; it is less dense so the mixture might be lean. A lean mixture can
> cause a ping aka. "spark-knock."
>
> 2. The colder weather might be causing the coolant temperature to run a
> little lower. Since a lower temperature coolant will extract heat better
> from the heads, this could also cause it not to ping when it is colder.
>
> I've been reading all the pinging stuff. A lot of factors could cause
> this, some of which have been discussed.
>
> I'm starting to wonder about where the heads are manufactured for these
> vehicles (differences in valves, chamber volume [compression ratio], metal
> composition [specific heat]), possible differences in fuel injector
> manufacturers (spray pattern & volume), computer differences (spark
advance
> curves, etc.), fuel quality by location (low octane [85], do they use
> oxygenates in the fuel [MTBE], atmospheric pressure by location (high
> elevation effect), sensor differences (the computer reads a variety of
> sensors [MAP, EGO, TPS..to name a few), etc.
>
> I wonder if there is a way to figure out where the engines in these trucks
> were manufactured and then plot engine plant versus pinging?
>
> Just some SWATs (scientific wild-a$$ed thoughts....).
>
> Hope this helps.
>
> Mike
>
>
>
>



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