Quote:
Originally Posted by stownsen914
I see references above to the pressure relief valve/spring and also pressure as indicated on the oil pressure gauge. Both of these things are for the pressure circuit, not the scavenge circuit. Pressure in the scavenge circuit should be less. A lot of what's pumped out of the engine is air. And aside from the filter and cooler, the oil just has to travel through the oil lines and then dump into the tank, which is vented to the atmosphere.
That said, cold oil means higher pressure (even if not in the oil cooler). I haven't heard of anyone measuring pressure in the scavenge circuit because generally speaking it doesn't matter. If it were me, I'd play it safe and assume the oil lines you get (or have made) can withstand the same 70 psi or so that you see on your gauge. That will be more than they'll probably ever see.
Scott
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The scavenge side is low pressure in normal operation, due to very low resistance downstream, as oil just flows back to the oil tank through the oil cooler line and front cooler. If the oil line is crimped at some point, pressure would skyrocket to match internal oil pressures in the proximal oil line. The thermostat in the right rear wheel well supposedly has a pressure bypass in addition to a temp bypass. That would make sense, as lots of folks have squished undercarriage oil lines yet have survived.
If the thermostat pressure valve failed (again pretty sure it has one) and you had a squished line, all bets are off...