Loved his feedback ratio!
"Would you buy a used car from this man?"
Fred Moir
Lynn MA
Steve MacSween <[EMAIL PROTECTED]> wrote: So you, like, um, want WHAT for $2?
Mac
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From: "Tom Hargrave" <[EMAIL PROTECTED]>
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Date: Fri, 2 Feb 2007 19:39:50 -0600
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Subject: Re: [MBZ] Cold start wear
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Marshall,
I agree that wash down is not a problem in a fuel injected car because
of the way the fuel is managed - the fuel is sprayed into the manifold,
usually well into the manifold & is well atomized.
But it is a problem in carbureted cars, even Mercedes. Gasoline wash
down is caused by fuel condensing out of the charge - the same process
is what makes carburetor chokes a necessity. If fuel condensing out of
the charge were not an issue then carbureted cars would only have a high
speed idle & would not need a choke for cold starting. The choke
enriches the fuel mixture to make up for the fuel that is condensed out
of the charge. But the fuel droplets tend to be larger when the choke is
closed & this actually adds to the problem.
Carbureted Mercedes gas engines do not wear out AS FAST, not because
gasoline wash down is not an issue but because the engines are made from
much harder steel then the mild iron American engines. Also, American
engines through the early 70's tend to be tuned richer for performance &
driveability. Tuning rich also adds to the problem.
Tom Hargrave
www.kegkits.com
----Original Message----
From: Marshall Booth <[EMAIL PROTECTED]>
Sent: 02/02/07 06:58 PM
To: Mercedes Discussion List <[email protected]>
Subject: Re: [MBZ] Cold start wear
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Tom Hargrave wrote:
> And Mobile 1 won't help a bit if the issue is gasoline wash down. The
issue
> is not lack of oil pressure at start up. The issue is oil that's
coating the
> cylinder walls being diluted with fuel condensate because the cylinder
walls
> are cold at start up. No-one's oil (synthetic or otherwise) protects
against
> this.
That's seldom a problem in a well engineered and maintained engine. The
cylinder walls of MOST well cared for Mercedes engines aren't seriously
worn even after a quarter or even a half a million miles although using
a synthetic might improve that slightly. Synthetics really do reduce
most cold accelerated bearing wear (and other friction caused wear).
Marshall
--
Marshall Booth Ph.D.
Ass't Prof. (ret.)
Univ of Pittsburgh School of Medicine
[EMAIL PROTECTED]
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