Ok guys, the mystery continues.
I have sought advice here about oil pressure and we have discussed this
before. But now more intelligence has been gathered.
My engine was built by a well meaning but as it turns out, inexperienced
Brit mechanic in 2005. Amongst more serious problems,
my engine's oil pressure also was below what I have come to believe is
"normal" pressure for a fresh, quality re-build.(50 to 55 psi cold, 40 to 50
psi hot with 10-30W oil). I was tired of, and concerned with, the O.P. gauge
showing the needle far to far to the left of center.
I had my engine removed and "blue-printed" by a knowledgeable and highly
regarded local shop. They found and corrected the other, more serious
problems, and when reassembled, put it on their shop dyno. During the
rebuild they installed a new, standard oil pump on the recommendation of
many on this list who responded to my earlier inquiries, to replace the high
volume pump that I had installed in the first re-build.They also installed a
large filter directly on the block for the several pulls the engine went
through on the dyno. They had hooked-up a mechanical oil pressure guage and
a transducer that fed into their diagnostic computer. My engine was showing
70 psi at 1500 rpm, and it rose to 75 at 5500 rpm (redline).
Back in the car with the remote oil filter set-up, with new, large diameter
hoses fitted, it shows 45 psi cold, and 25-30 hot at 3,000 to 4,000 rpm. I
am at a loss to understand how the remote filter set-up could possibly cause
this drop in indicated pressure. The only other variable is my pressure
gauge, which is nothing if not consistent.
I will appreciate any wisdom or suggestions as to what is going on and how
to correct this low pressure problem.
Thanks for your help,
Dave
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