Quote:
Originally Posted by shotgunslade
Just got some new information about the overheating that occasionally plagues our cars. Seems that the water pump for the 4 cylinder Subaru engines has a tendency to cavitate over 6700 rpm. It might be that our water pump has the same problem. Cavitation occurs because the water pump creates an area of lower than atmospheric pressure that allows the coolant to boil at a lower temperature, creating steam bubbles in the coolant stream. That might be why a higher pressure radiator cap would help this problem, causing the bubbles to collapse sooner, before they have an opportunity to create havoc.
I have had a lot of difficult finding an "import" size high-pressure radiator cap. I have ordered a Crucial 1.4 bar cap (approx 20 psi), from Crucial Racing Products. Will be at Pocono next Friday and will post how it works.
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Dan,
Good point. Now we just have to find a better water pump 
-Bill
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'92 Fully caged, 5 speed, waiting for its fully built EG33
'92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension
'92(?) Laguna, 6 spd and other stuff (still at OT's place)
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