NetNews Usenet Archive 1992 #30/NN_1992_30.iso/spool/rec/autos/tech/16621

Text File | 1992-12-14 | 1.7 KB | 38 lines

Newsgroups: rec.autos.tech
Path: sparky!uunet!haven.umd.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!saltydog!greg
From: [e-mail] (Gregory R. Travis)
Subject: Re: Oil Priming System
Message-ID: <greg.724353019@saltydog>
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Organization: Data Parallel Systems, Inc
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Date: Mon, 14 Dec 1992 17:10:19 GMT
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Although it may get oil into the passages sooner, none of the pre-lubers
that I've seen will fully float the crankshaft and rods.  To do so would
require an enormous amount of pressure; full floatation usually occurs
only when the crank itself begins to turn and force oil between its journals
and the bearing surfaces.

The same will go for rocker arms, etc.  And, of course, you're not getting any
benefit for the cylinder walls or cam lobes with a preoiler as these
surfaces are splash-lubricated.

Unless you get the surfaces to float fully prior to startup, there is ALWAYS
going to be some metal-metal contact at startup no matter HOW good your
preoiler.  Furthermore, if you drive often (like once a day), the amount
of time from zero to full oil pressure without a preoiler will likely be
very small.  There is almost always enough residual oil left around to almost
fully lubricate the reciprocating parts.  It's only if the engine has been
sitting for a week or so that parts become dry.

I say:  Save your money.

greg
--
Gregory Reed Travis                D  P  S  I
Data Parallel Systems Incorporated   [e-mail] (For MX mailers only!)
Bloomington, IN                 [e-mail] (For the others)