I suspect that the pump is a considerable bleed when it is inop ie initial
charging of the system, before it is spinning. I don't see it as a check valve
at that point, sorry to disagree.
Generally speaking (typing), one of the biggest, if not the biggest cause of
wear in an engine in service is "dry" starts. The 1500 spit/midget engine with
certain oil filter/housing configurations is the perfect example.
I agree that an engine in good shape, and not driven hard (ie street engine),
would benefit little, if at all, from an accusump. Race engines need all the
help they can get.
My intent in posting about this was not to start a debate. I simply saw
information posted that contradicts normal practice, & my personal experience
using accusumps for a long time, and I wanted to offer some additional
thoughts on the matter...
Glen
-----Original Message-----
From: Randall <tr3driver@ca.rr.com>
Cc: fot@autox.team.net
Sent: Wed, Sep 8, 2010 5:21 pm
Subject: Re: [Fot] Accusump
> Of course the pump is positive displacement, when it is pumping oil. If
> it is just sucking air (as in a particular hard left-hand corner),
My point is, regardless of what is on the inlet side of the pump, you can't
force oil backwards through it (except to the extent it leaks all the time).
It acts like a check valve, even if it is not turning.
I am assuming that the main purpose of the Accusump is to avoid loss of oil
pressure in hard turns. Pre-lubing is a nicety, but these engines normally
last many thousands of starts with no pre-lube, so it doesn't seem like a
requirement to me. Does anyone really believe that it extends the life of
their race motor?
-- Randall
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