[Fot] Low oil pressure after overheating

[Marcel Van Mulders]

Putting shims behind the spring in the pressure relief valve will increase
the oil pressure when the engine is cold, but it won't have any influence
when the engine is hot, because the pressure relief valve is fully closed
when the oil has warmed up (unless it is leaking...) Without a pressure
relief valve, the oil pressure could be very very high when starting the
engine from cold. This valve is there only to prevent damage.
If the gauge needle is no longer moving at idle after warming up, it's
likely that something has happened since the overheating. The gauge can be
at fault. If not,checking the oil pump and bearings is not that much work.
It would be a pity to ruin a freshly rebuilt engine, it seems the engine has
not a lot of damage now.
Marcel
-----Oorspronkelijk bericht-----
Van: Fot [mailto:fot-bounces at autox.team.net] Namens damys at charter.net
Verzonden: donderdag 21 augustus 2014 3:30
Aan: fot at autox.team.net
Onderwerp: [Fot] Low oil pressure after overheating

Hello,

I'm new to the group and hope I can get some advice.  My son and I are
building a GT6 into a racer and need some help.  We've had the engine
rebuilt with some mods.  Ross pistons, WBC cam, roller rockers, head shaved
to approx. 10-1 compression, mild port job and balanced.

At Elkhart last weekend we overheated the engine and now there is no oil
pressure at idle.  The engine runs strong, no noise, and still has pressure
when cold.  As the engine warms the pressure drops.

I will add a heavier radiator cap and a shroud to direct air into the stock
style (aluminum) radiator.  It's been suggested I shim the pressure relief
valve to increase overall oil pressure.

Any advice on resolving the oil and temp problems.

The engine easily turns 6500 RPM's but we have the MSD set at 6000.  The
engine has approx. 1000 miles on it.

Thanks,

Dave Amys
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