Mike perhaps a little more information on the subject of oil dilution would
help.
The rapid wear on startup is reputedly attributable to the excess liquid
fuel in the combustion chambers washing virtually all the oil off the upper
cylinder walls and allowing metal to metal contact between the rings and the
bore.
Because the rings are designed to prevent anything but the very slightest
coating of oil on the bores it takes a while for the oil protection to be
replaced and thus the rate of wear can be dramatically increased.
Fuel dilution of the oil in the engine lubricating system is not a real
problem. In fact older aircraft engines, PW1860's for one as I recall, used
the introduction of fuel into the oil circulation system to facilitate
easier cranking on cold mornings. This fuel used to dilute the oil, and thus
decrease its viscosity, evaporated out when the engine warmed up.
Michael Salter
www.precisionsportscar.com
-----Original Message-----
From: Mike MacLean [mailto:macleans@earthlink.net]
Sent: Wednesday, April 19, 2006 8:41 PM
To: Michael Salter
Cc: 'Austin-Healey List'
Subject: Re: Pistons Out
So, would an oil change every 2000 miles help lengthen the life of the
engine?
--
Mike MacLean
60 Sprite
56 BN2
http://home.earthlink.net/~macleans/
Michael Salter wrote:
> They probably won't Patton,
> It is pretty widely believed that the high mileages that modern engines
are
> achieving are not attributable to improved materials or lubricants but to
> good electronically controlled fuel injection.
> Carburetored engines will always suffer from oil dilution, particularly
when
> cold and that alone causes more wear than anything else.
>
> Michael Salter
> www.precisionsportscar.com
>
>
> -----Original Message-----
> From: owner-healeys@autox.team.net [mailto:owner-healeys@autox.team.net]
On
> Behalf Of Patton Dickson
> Sent: Tuesday, April 18, 2006 3:55 PM
> To: Alan Seigrist Blue 100
> Cc: David Nock; Ned Smith; Austin-Healey List
> Subject: Re: Pistons Out
>
> Trying not to be a smartalex, I seriouslly want to know how are rebuilds
on
> motors that most everyone here assumes are tired at 60K+ original miles
> going to last 200K miles?
>
> Patton
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