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), I would prefer
that the charge go where it is supposed to go ie the bearings., and let the
oil pump do what it does. If a system isn't prone to sucking air, then the
accusump becomes less critical, in that respect.
Also when cold starting, before the engine is turning, there is a lot of
restriction on the bearing side because the oil ports are not likely lined up,
ie not much bleed.
Just as a matter of interest I have 2 oil pressure gauges in my spit, one for
running and the other for accusump. When I used to run F prod with slicks,
guaranteed every lap coming out of #2 at palm beach, the main pressure would
drop a tad & then the accusump would kick in, just for a moment until the oil
pump got things sorted out...
JMHO
Glen
-----Original Message-----
From: Randall <tr3driver@ca.rr.com>
Cc: fot@autox.team.net
Sent: Tue, Sep 7, 2010 2:08 pm
Subject: Re: [Fot] Accusump
> without the check valve, some of the charge is going to want to back
> up
> through the pump, so it is reducing the effectiveness of the thing...
But the pump is positive displacement, right? So oil can only go backwards
through it by leaking through the clearances, which hopefully are fairly
small?
Plus, it's going to be running at the time, so any oil that leaks back into
the intake will likely get sucked through the pump and stuffed back into the
galleries?
This is outside my experience, so I'm just asking questions. But I still
don't understand the need for the check valve, and since it was brought up
...
-- Randall
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