Brian covered this pretty well, however I have seen old steel braided lines
with collapsed internals.
My 350 Chevy is set up scavenge pump (three) to Oberg filter to tank, to
pressure side then to cooler, filter and then engine. The Oberg catches
anything down to 60 mesh before the suction side of the pressure stage can
get damaged. Actually I think having the filter upstream of the cooler
would be better to keep the cooler clean.
I have also never seen a filter that wouldn't flow enough, even though it
may be bypassing oil. If your problem is not enough pressure, check the
regulating valve on the pump. The one on my Weaver has a rubber o ring
under the locking nut and this tends to prevent true locking.
Lots of lit. on dry sump systems out there.
RCC
-----Original Message-----
From: Dr G W Owen <ensgwo@bath.ac.uk>
To: vintage-race@autox.team.net <vintage-race@autox.team.net>
Cc: british-car-pre-war@autox.team.net <british-car-pre-war@autox.team.net>
Date: Wednesday, September 02, 1998 12:06 PM
Subject: Dry sump problem
>
>I am having a problem with the dry sump scavenge on 6 litre engine when
>teh oil gets hot (85 degrees plus). I have three main theories. Any
>suggestions as to the likehood would be much appreciated
>1. The pump is knackered (thought unlikely)
>2. The oil filter (full flow type) for some reason is not of sufficient
>capaacity
>3. I have some rubber tube on the scavenge side of the return pumps. This
>could be internally collapsing (no external evidence). A bit like sucking
>too hard on a thick shake!
>
>My feeling is that it is #2, but I dont know if pumping the air/oil
>mixture through a filter designed to take just oil is a problem. And if so
>why should it be temp dependant?
>
>Any ideas
>
>Geraint Owen
>
>
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