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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Illicit Pleasures.
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
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