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Old 10-05-2012, 04:26 AM   #69
DHK
Registered User
 
Join Date: Mar 2012
Location: Estonia
Posts: 681
My Ride: 2002 BMW 325Ci
Causing cavitation in a liquid is very difficult. It requires a rapid change in pressure that just wont be experienced in a car's cooling system.

Having a 1 bar cap will have some negative effects. You will no be able to keep as much coolant in your car, and it boil at a lower temp.

These could both lead to problems, however weather either of these issues rise to a level where they could cause damage... I dont know.
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