I have a rebuilt pinto with new bottom end, new std crank bearings, only polished crank (not 0,25mm undersized), the polished diameter was 0,010mm under spec, I kept the original burman oil pump, inspected it before putting it back and it looked quite good. I have the oil radiator and 20w-50 mineral oil.
I started the engine doing some 20 minute around 2-3k revs to help break in the new pistons, done it twice and now I have around 3,8bar (55psi) at cold start, and around 3,2bar (45psi) with the engine warm (don't have oil temperature sensor, but the water was at 90°).
On friday I have a track sessions to properly break in the engine and then running it hot so I will have precise number regarding hot oil pressure.
What I'm wondering is if I should be going with an higher pressure pump, or just try to keep it standard with new internals.
Or if I can keep it like this, if those numbers are right, considering that this engine will be living on rally stages above 3-4k rpm.
Thanks, Enea.
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