50PSI oil pressure up to 6000+ RPMs?

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10-02-2011, 07:12 PM

#11

MikeGyver

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Quote:

Originally Posted by Coban

... The relief valve in the oil pan near the oil filter ...

When did GM start doing that?

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10-02-2011, 08:26 PM

#12

1989k1500

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Quote:

Originally Posted by ayousef

this is the sort of answer I was waiting to hear, because I can feel there is something HOLDING the pressure at 50is PSI, and it was pretty steady at 50PSI. Ill get alot of answers tomorrow when I figure out for starters what did this engine start its life as before it ended up being a 427

Its probably an LS7 crate engine.

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10-02-2011, 09:59 PM

#13

ayousef

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Quote:

Originally Posted by 1989k1500

Its probably an LS7 crate engine.

I think so too, Ive been reading about their (SLP) Camaro ZL1 which is almost the same package as my truck, but that makes me wonder if I really do have an oil pan with the pressure relief valve limiting the oil pressure.

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11-04-2011, 09:50 AM

#14

Gray Ghost Silverado

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Quote:

Originally Posted by ayousef

Yes, you do have one. Guaranteed. There's nothing wrong with 50psi peak whatsoever. All in all, I bet it was built according to GM spec on the bearing tolerances. I built my G8's L76 at some real tight clearances and because it was once a DoD motor here's it's specs.

Idle at 40*: 58psi
Idle at 180*: 49psi
2000 rpm at 40*: 75psi
2000 rpm at 180*: 60psi.
4000 rpm at 85*: 97psi
4000 rpm at 188*: 78psi
6000 rpm at 205*: 65psi
7000 rpm at 220*: 65psi

The relief valve is open regardless at 65 psi on my engine or else when cold it'd be way over 100psi.

Last edited by Gray Ghost Silverado; 11-04-2011 at 10:16 AM.