08-06-2012, 11:47 AM
Water cooling is only for after switchoff... It's a thermal syphon effect...
The oil will take any of the heat load that needs to be dissipated... The water doesn't come into contact with the bearings, it doesn't cool them... It purely cools the CHRA slightly...
Don't think about putting it on the heater matrix return, because it'll cock it up... The water cooling systems on these engines are surprisingly more thought about than you think - they're not just a bunch of pipes, some water, a radiator and a pump, leave them standard, or you'll cock it up... They're finely balanced between allowing enough water through the heater matrix when they're cold - enough to stop the head boiling before the thermostat opens, but restrictive enough that when the thermostat opens, it goes through the radiator, not just taking the easy option through the heater matrix, and boiling the head when hot...
The oil will take any of the heat load that needs to be dissipated... The water doesn't come into contact with the bearings, it doesn't cool them... It purely cools the CHRA slightly...
Don't think about putting it on the heater matrix return, because it'll cock it up... The water cooling systems on these engines are surprisingly more thought about than you think - they're not just a bunch of pipes, some water, a radiator and a pump, leave them standard, or you'll cock it up... They're finely balanced between allowing enough water through the heater matrix when they're cold - enough to stop the head boiling before the thermostat opens, but restrictive enough that when the thermostat opens, it goes through the radiator, not just taking the easy option through the heater matrix, and boiling the head when hot...
