<BLOCKQUOTE>quote:</font><HR>Originally posted by mls48341:
My brand new 454 has 15 lbs hot pressure at idle, but climbs to 40 lbs @ cruising speed.
This is with a el-cheapo guage so who knows.
As long as you're building pressure with
rpm increase you should be o.k.
Well, time to tell my story again... 2 yrs ago, fresh 383, nice parts runs well but has about 5psi at idle warm. Engine builder doesn't like it so out comes the mill. Lower end gets looked at and a new oil pump goes in... Mill goes back in the car... Same 5 psi warm but climbs 10 psi per thou rpm. Builder shakes his head but says run it, if it breaks he'll fix it. I switch to Kendall 50wt and see about 7psi warm idle. We talk about the slight increase and I learn it's because he set the clearences just a freckle to the loose end of spec's...
I drive the car all summer, maybe 3000 miles and builder and I just keep shaking our heads. Every time we get together it's could it be.... The next summer it's driven about the same our longest trip (Hot Aug Night in Reno) came and went and I changed the oil on returning. Well I started to notice that when warm the pressure was not what it was!
Still about the same at idle but the longer the drive it seemed to fall off some. Straight to the builder and out comes the mill again. Now the mains are all copper and worn badly, rods look ok.
Final diagnoses: Casting flaw in the block that manifisted into an internal oil leak causing the low pressure at warm idle. The 4 nights of cruising at HAN (idle speeds for hrs on end) is what we suspect killed the bearings...
What I am trying to say with all this is if your always rev'd and rolling there may never be a problem. Just be aware of what extended idling can do...
If your clearences are a bit on the loose side run a heaver oil and you may see things improve.
"The '69, the '96 & the club