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That's how I would see as far as I recall something like 75%+ of the
wear is during cold start up. So if you can circulate the oil at low
revs ie battery power only then the wear will be lessened. When the
engine is started let it idle for little to fully circulate the oil and
allow the oil to warm up and you should reduce much of the wear.
Romano Kroemer wrote:
> Atwell-
>
> >
> >At 11:12 AM 2/17/98 +0000, Romano Kroemer wrote:
> >>Listers,
> >>
> >>after the recent threads about oil-filters with drain-back valves
> and
> >> starting cars after long storage, I thought I would share my
> car-starting
> >> method with this list:
> >
> ><snip>
> >
> >My understanding of the wear incurred at start-up is thus:
> >
> >It is the strain of engine compression on the pistons, pressing on
> the
> >cylinder walls and crankshaft, that are bad. Cycling the engine
> without
> >starting it does nothing to reduce this wear.
> >
>
> .. but this compression is always there, also when the engine is
> running.
>
> My understanding of wear at start-up is that there is no oil where it
> should
> be for some seconds, while the engine is revving already at 1000+
> rpm. Then
> the oil-pump has done enough work to distribute the oil and the
> oil-pressure
> has come up.
>
> So, if I cycle/revv the engine at a lower rpm (with the starter motor
> only),
> until I have distributed the oil/built up oil-pressure, I should
> induce
> less wear.
>
> Am I missing something here? Enlightment please!
>
> - Romano
>
> >This is the rationalization behind the practice of some folks who,
> before
> >starting an engine that has been sitting a long time, REMOVE THE
> SPARK
> >PLUGS and crank the starter long enough to generate oil pressure.
> >
> >"Pre-oilers" that use small electric pumps provide oil pressure
> independant
> >of the engine. Some use a pressure system instead of a pump.
> Drawback:
> >these pre-oilers can cost several hundred dollars.
> >
> >Speed shops such as Jegs or Summit (in the USA) can provide exact
> info.
> >
> >my .02 ...
> >
> >BTW, I have also heard that the oil film inside an engine will
> protect the
> >cylinders for two weeks to a month. Can anyone verify this?
> >
> >
> >
> >Atwell Haines
> >'79 Spitfire FM96062 UO
> >
> >"47.5% of all statistics are made up on the spot."
> >
>
> --
> ==
> ============================================================================
>
> Dr. Romano T. Kroemer
> Phys. & Theoret. Chem. Lab.
> University of Oxford
> South Parks Rd. | Tel: ++44-1865-275475
> Oxford OX1 3QZ | Fax: ++44-1865-275410
> England, U.K. | Email:
> romano@bellatrix.pcl.ox.ac.uk
> =============================
> =================================================
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