Like Bill Babcock, I usually blip the engine to pump the oil pressure back
up just before I shut off. I do want 70-80 in the Accusump then (but I'm
looking at my engine pressure gauge, not my Accusump gauge, which I cannot
see when I'm belted in). My Accusump gauge is usually within a pound or two
of the engine gauge.
When I turn it back on, the Accusump pressure and the (zero) engine pressure
equalize so I have 30-40 in the engine when I start it. I don't leave the
Accusump open for any 30 seconds though. I just watch my engine pressure
gauge, and when it quits rising (it has all the pressure the Accusump can
give it) then I hit the key. If I leave it open too long before starting, I
begin to lose engine pressure again.
Mine feeds to a tee just before the inlet of what used to be the oil filter
boss on the engine (which now has a remote filter and an oil cooler. So it
goes directly to the engine, and the other direction goes directly toward
the oil cooler but a one-way checkvalve there prevents it flowing into the
cooler.
--Rocky
----- Original Message -----
From: "Henry Frye" <thefryes@iconn.net>
To: <fot@autox.team.net>
Sent: Tuesday, October 01, 2002 7:54 AM
Subject: Accusump pressure
> This recent thread about Bob Kramer's Accusump letting loose got me
> thinking about the pressures the thing actually sees.
>
> My Accusump (3 quart) is plumbed directly into the oil gallery on my TR4.
I
> run AN12 size hose back to the Accusump, which is mounted on the
passenger
> side floor. I have a manual ball valve, not the electric solenoid that
> Accusump sells. I pre-charged the air side of the bladder with whatever
the
> instructions said, something like 8 or 12 PSI. I have the one-way valve on
> the engine's external oil lines to prevent the Accusump from throwing it's
> load out a bad oil cooler or the like. The Accusump gets very hot after a
> session indicating it is doing it's job..
>
> With the engine running, my Accusump gauge reads about 5 PSI less than the
> oil pressure I have at that moment. I thought that was about right, taking
> into account the big bore oil lines I use, gauge inaccuracies, etc. I
never
> gave it much thought until I was at Watkins Glen and some guy comes up to
> me and asks me what I know about Accusumps. His was not getting hot when
on
> track. I looked at his car, and the gauge on his Accusump read about 80. I
> wandered about the paddock and looked at a few others, and saw several
> gauges that read about the same.
>
> So how are all these cars I looked at capturing 80 PSI in their Accusumps?
> It would seem to me they must closing the valve when the engine is
creating
> 80+PSI of oil pressure.
>
> I never want to see that much oil pressure, even a the end of the longest
> straight.
>
> What I do is reach down and close the valve as I am entering pit lane. At
> this point the engine is only turning about 3-4K RPM's, and I always seem
> to capture only 45 to 50 PSI in the Accusump.
>
> This sounded right to me, never gave it a second thought. Then I see
> several people are capturing in the ballpark of 80 PSI in their Accusumps.
>
> So, whaddahya'll think?
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