Hey Aubrey, I'm not sure having over 70psi of oil pressure at speed is a detrement to your racing program right now. When your engine is at 100F water temp what do you think your oil temp is? Most likely much cooler. what kind of pressure do you have at 160 oil temp ?? how much do you think 70 psi of oil pressure is hurting you? 2 hp? 10 HP? WHat oil pump are you running?
I ran the Royal Purple #11 in my cars with good luck, as well as the Gibbs oil. I also like the Valvoline racing, but I am told that they are out of the racing oil business. I think determining the viscosity of the oil you run depends on the oil tempature range you will be racing with, as well as bearing clearances.
Good luck out there this year, I like your car alot and hope you make strides with it this year....
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Originally Posted by Aubrey N Bruneau
Lots of info there, Bill. Thanks for posting.
I ordered a case of 5 / 30 Royal Purple racing oil.
I have .003" - .0035" clearance on crank, and .008"+ piston to wall. Very low tension Total Seal oil rings, and using regular teflon valve stem seals ( 3/8" guides ). Lifters are solid flat tappet, light weight coated tool steel.
I started the engine today, and ran it for about 2 minutes ( flushed the cooling system ). When this thing is cool, say 70-100 degrees F, oil pressure at 1600 RPM is over 70.
I don't like it.
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