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A positive displacement pump is pretty much a straight line increase in output coinciding with rpms...... since making the pump variable in terms of the engine rpms is not practical... they put valves which will release the pressure when it is beyond what is needed... and to keep from blowing seals.... on the back of the 240 oil pump three different pressure valves were available over the years...
Since he did not indicate any over heating or bad noises.... and if his claim that it remained over one bar... I suggest he might be OK...
not that he followed the best procedure... but our engines are over built and he might have benefited from that.
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