Does anyone have personal experience with blocking or altering the
bypass valve on the filter head of TR's?
The stock oil filter head on a TR is made with two relief valves. One
regulates pressure to the engine by dumping oil back to the sump so
the pressure to the engine isn't too high. The other one is what I am
interested in.
The second one is a bypass that senses pressure differential between
the oil filter inlet and outlet oil pressures, to prevent a clogged
filter from starving the engine. It also prevents starvation when the
oil is too cold and doesn't want to flow well through the filter. The
problem with that valve is that it lets oil bypass the filter at too
low a pressure. The big disadvantage for race engines is that when
something starts to disintegrate, all the debris bypasses the filter
and contaminates the whole system -- particularly damaging the
expensive crank and the less expensive oil cooler and hoses.
I'm thinking that in a race engine, we change oil often and the
likelihood of a clogged filter is slim. Likewise, most of us use
20W50 or some such, which acts like 20W at low temperatures.
Here's my question: It seems that for our race engines, we could
disable the bypass valve, or at least significantly change the
pressure at which it bypasses, to make the oil filter more of a full
flow filter than a bypass filter. Has anyone done this? Pros and cons?
uncle jack
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