I haven't tried a modern oil pressure gauge on my engine, but it reads about
45-50 psi cold, 25 psi hot at idle . The pressure does come up as you rev the
engine, but it rarely goes above 50 PSI on the gauge. This is a 120,000 mile
5.0 with worn bearings...
Custom block adapter (similar internal orifices to the Canton and Dale's
adapters), -10AN lines to a left-headlight mounted filter with a 90 degree
tubing bend on each line.
There is no flow through the gauge line, so there is no pressure drop across
the gauge line. The only thing that is influenced by the size of the gauge
line is how quickly the gauge might respond.
Theo
________________________________________
From: tigers-bounces@autox.team.net [tigers-bounces@autox.team.net] On Behalf
Of Dave Munroe [dave@munroe.ca]
Sent: Monday, August 02, 2010 12:21 PM
To: tigers@autox.team.net
Subject: Re: [Tigers] Oil Pressure
Dr. Mayf:
You make a lot of good points.
First, I will test my gauge as the next step.
The remote filter does have lots of places where the various fittings and
twists and turns can reduce flow and as you have explained, reduce pressure.
But I wonder if other Tigers that have either the original or aftermarket
remote filters fitted suffer the same pressure loss?
We have asked owners to report in the past on their oil pressure, but it
seems only those with 60 to 70 psi come forward with the info. perhaps there
are lots of others like me who have Tigers with this level of oil pressure,
but don't want to talk about it! It just seems unlikely that a stock gauge
would be fitted with a gauge that reads all the way to 80 psi, with 50 in
the center, if "normal" was 30 to 45 psi. As humans, we naturally like to
see gauges with the needles "in the middle" of their range, or higher, but
lower kind of gets the anxiety juices flowing, at least with me!
I only have a little over 300 miles on the engine since re-installation, so
the oil that was in the engine on the dyno is still in there. I plan to
change it at 500 miles. It is 10-30 Castrol. In the engine before the
re-build I tried oil viscosities up to GTX 20-50 with no change in the
readings on the gauge.
The dyno O.P. line was taken off at the same place as the stock line is
attached. It was connected to their mechanical gauge by a flex hose, much
larger in dia. than the stock line.
The shop didn't use the remote line because it was easier to just screw a
large filter onto the block.
On the dyno in stripped configuration, the engine made 450 ft lb torque at
5,100 rpm and 317 hp at 5,500 rpm.
Its a nice street engine.
Thanks for your thoughtful reply Dr. MayF.
Dave
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