Re: [AMC-list] Oil Pressure II

[tom jennings <tomj@xxxxxxx>]

I can tell you from physical experiments that gear pump end clearance makes
a fantastic difference in flow. By getting clearances down to < .003" the
pump in my 195.6 exceeded the total flow capacity of the oiling system --
likely doubled flow (something of that order). Stock is (I forget offhand
exactly) like .010", very loose. .002, .003 was too tight (ask me how I know
:-) but likely .005+ would hugely improved flow without (?...) danger of
gears binding to the cover.

Flow is NOT the same as pressure! But since there's more or less a fixed
resistance to flow downstream of the pump (galleries and all that rot)
increased flow into it will increase pressure, so for a system without
mechanical problems (blockages or leaks) pressure is a good-enough
indication of oil flow.

On Wed, Nov 17, 2010 at 10:57 AM, Frank Swygert <farna@xxxxxxx> wrote:

> All I can do is confirm Davis' opinion. Check the oil pump end gear
> clearance and tighten it up a bit to increase pressure slightly. But you
> really don't need to -- 10 psi at hot idle is sufficient, even if you (and
> I!) would like to see a little more. As long as oil pressure goes up with
> rpm as it should you're fine. Try idling hot at 1000 rpm and see if pressure
> goes up to 12-15 and stays there hot. If it does all I'd do is boost idle to
> 800 rpm to get 1-2 more psi at hot idle and leave it alone, unless it's a
> drag race engine. For a normal driver you're just fine.
>
> -------------
> Date: Mon, 15 Nov 2010 17:37:00 -0800 (PST)
> From: Davis Martin<martin-davis@xxxxxxxxxxxxx>
>
>
> Jim,
> ?Sounds like the only problem you have is your oil pump end clearance was
> set to
> the loose side. You really dont have an issue unless your running the
> engine
> hard and up past 5000 RPMs. DO you have a blueprint from your engine build?
> What
> were the pump clearances??If it really bothers you you can swap in a
> thinner oil
> pump gasket Bultear?sells a .007" gasket. Stock gasket is usually .009 to
> .012
> Davis
>
> --
> Frank Swygert
> Publisher, "American Motors Cars"
> Magazine (AMC)
> For all AMC enthusiasts
> http://www.amc-mag.com
> (free download available!)
>
>
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