Re: [AMC-list] ruined in 60 seconds

[tom jennings <tomj@xxxxxxx>]

I shouldn't have posted yesterday at all. I'm embarrassed. I was assuming
I'd have problems but not total oil loss!

First thing I'd check is the oil pressure relief valve. You still have one
> in the block, correct? And I just thought of something! Your external oil
> filter setup is what failed. You're getting full oil pressure there no
> matter what, so the filter gets whatever the pump puts out. That's the
> problem -- no pressure relief between pump and filter. That's why the
> full-flow pump has that extra passage to the oil pan and the pressure relief
> valve in the oil pump cover.
>

Nahh, that's not what happens, the downstream relief valve ensures that the
pressure upstream (filter inlet) is relief pressure + filter pressure drop
(a few PSI max) and in any case, the filter I chose has a bypass (10PSI
difference in to out) so the highest on the inlet side -- other than a
pinched-flat hose or spectacularly blocked filter is relief+1-PSI.

The pressure by-pass stuck, that much is for certain, I'll figure that out
next week when I get to it. It's really obvious that is what happened. If
the main gallery peaked at 60 psi the pressure at the inlet would be the
small drop across the filter plus 60 psi.



I only buy Wix (NAPA) filters, and I'd never let it go long enough to clog
anyways. That line of possibilities doesn't scare me.

Given a choice, the relief on the inlet side is ideal, that's what OEMs do.
But this isn't a problem here.
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