Re: Illicit Pleasures.

[ANITA.SHERWOOD@xtra.co.nz]

ANITA.SHERWOOD@xtra.co.nz wrote:
> 
> pcsolutions wrote:
> >
> > From: egilk@sn.no  To: jag-lovers@sn.no
> >
> > > I also have a suspicion that the oil pressure does an important job
> > in
> > > "cushioning the blow" when, in a four stroke engine, the direction
> > of
> > > the bearing load changes between the inlet and compression strokes.
> > As
> > > can be clearly heard in an engine with well worn conrod bearings as
> > a
> > > clear muting of engine noise when the oil pressure builds up after
> > a cold
> > > start.  Egil
> >
> > You are correct.  The oil is there to "cushion the blow"  the
> > hydraulic wedge supplied by the pump ensures two things... that the
> > bearings/inserts have a fresh supply of cooler oil to prevent heat
> > damage to the rod inserts, the rods themselves and the crankpin, and
> > to provide a mobile surface for the rod inserts to ride on.
> >
> > The oil *is* the bearing.  The bearings are often refered to as
> > inserts.  Their main purpose is to pass heat to the connecting rod,
> > to provide the proper clearance for the oil wedge to reside in, to
> > control the oil flow by providing a restriction to the flow, and to a
> > small degree to absorb small debris in the the soft babbit surface.
> > The babbit is comprised of tin, copper and antimony it forms a soft
> > maleable surface and provides a small amount of "embedability"  which
> > is absolutely no substitute for cleanliness when assembleing and
> > engine.
> >
> > Tim
> Dear Tim
> Exactly what I was taught at Tech many years ago. WE we told that the
> oils job was 70% cooling, 30% lubrication
> Regards Murray

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References:

• Re: Illicit Pleasures.
• From: "pcsolutions" <pcsolutions@mindspring.com>

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