Try Valvoline Racing VR-1 20W50. Reasonably priced and carries good pressure hot. That will take the oil out of the equation.

My oil pressure has always dropped at WOT . Used to be worse with undersized oil cooler lines (40psi)
Again ran like that for years. As long as the volume is there it`s no ideal but does not cause any damage.
Now I run a Shumann pump and it still drops at WOT.

I`m open to ideas on why that is happening. Joes motors are rock solid at 75+ psi at wot.
I thought oil gets hot and thins out = lower pressure

I do NOT.. was the pickup that Summit calls for with that pan but didn't actually measure it...

My oil stat is built in to the cooler. when the temp comes up, it's supposed to expand and block off the bypass tube.. apparently it was failing to do that.
http://www.mrcool.us/mrc-cph-775.html (flow diagram on this page.. Can't seem to link it as a picture)

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My initial test run, my oil pressure would drop to 35 psi at 5000 RPM. No oil temp gauge on that run, but I leaned against my remote filter in the bilge and about lost the skin off my arm

I then plugged off the cooler bypass tube, got my oil temp gauge installed went out again with the same engine oil....
at 170 degrees I could hold my hand on the remote filter.. and came up with the pressure results shown in the first post...

Was thinking this may be my next step... Do they have a "street" and "racing" formulation of it or is the VR1 all the same ?

[QUOTE=Boatally Insane;4543265]Was thinking this may be my next step... They have both conventional and synthetic versions. I was speaking of the conventional and it runs under $5/quart in my area..

may want to pull the oil filter and dump it out,,see if anything is in there.hope there isn't.

Pickup could be too close if you didn't measure, also what fittings are you using? Sharp 90 or sweep? I ran sharp 90's in past with no issues (stock brass Merc) but with new builds I went all long sweep or straight for flow.

Also did you run these coolers before? Maybe the stat in cooler is restricting it?

I run melling select pumps with mains at .0032-.0035 1-4, and rear is .0040 rods .0026-.0027 lifters .0020 I have 78 cold even at idle, 75 hot running And 40 idle hot..

They're full flow 90's... but there are 6 of them.. Don't know if it's worth going to straights ? Would have to use longer hoses...


I didn't put the oil stat back in..
I plugged the bypass tube by cutting a 1/4" carriage bolt to the right length held in by a plug so, no restriction there...

maybe because you have spring oilers a lot of oil is in the valve covers and not keeping the oil pickup submerged in oil.did you try adding an extra quart of oil?