Concur regarding the positive displacement pump acting as a fairly effective
check valve. I do not have a check valve in my system and precharging to
35-40 psi off of the 1 1/2 qt accumulator is no problem. The only thing the
check valve would improve on in my opinion is if you have a leak from a
hose, cooler, oil filter, etc or if the pupm drive breaks. A 25psi idiot
light is the only thing that may help then.
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Randall
Sent: Tuesday, September 07, 2010 11:08 AM
Cc: fot@autox.team.net
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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