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Not really. Perhaps I didn't explain properly (I tend to do this <G>).
Most wear takes place during start up. For example, start car and let it
idle with the choke for a couple of minutes to improve smoothness when
driving off. The low temp. causes corrosive wear, the over rich mixture
causes oil to be washed off cylinder walls and cold oil does not reach all
the parts it needs to lube. As you drive off, the engine becomes warmer (as
indicated on the water temp. gauge - which tends to show an average) but the
temp. still varies during stop-start driving, especially at the top of the
piston. This variation causes corrosive wear. The engine wear rate has now
dropped significantly, however. As you get out onto the freeway, overdrive
in or not, wear drops to almost nothing - constant temp., throttle opening
etc.
As piston speed increases, the lubrication film becomes thick enough to
eliminate metal to metal contact. Most wear takes place where the top ring
comes to rest i.e. TDC, as we all know. The top ring causes most wear
because of increased tension on the cylinder wall cause by combustion
pressure. The greater the throttle opening, the greater the MEP, the
greater the wear. This also shows
-----Original Message-----
From: ccrobins [SMTP:ccrobins@ktc.com]
Sent: 24 February 1999 06:53
To: Mike Venables
Subject: Re: MGB Overdrive?? - engine wear
OK, so if the temperature of operation is the big deal, then it
follows that, when in OD and burning less gas at lower RPM, the
engine
is experiencing less wear.
Simple, eh?
CR
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