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Thats why the big boy engine builders put squirters in their engines, to squirt oil into the back of the pistons. ronnie -----Original Message----- From: craig k [mailto:vwbus@ckoon.org] Sent: Wednesday, April 09, 2003 9:45 AM To: Carver Cc: Type3; Vintagebus Subject: Re: [VB] Engine Oil & Cooling >Note >that there is nothing mentioned about oil. I >think that the cooling of the oil is to prevent >it's breakdown and provide lubrication, and not >to directly cool the engine, but I could be wrong. >... What is the heat path >to the oil? nope, exactly right. the heat path is some from friction, more from the oil that washes the cylinder walls and rocker areas, but mostly due to convection to the case from the heads/cylinders. cooling the oil will help keep it from thinning, but not correct the original problem, which is too much heat stored in the head/cylinders. i'd like to hear from those running extra oil coolers and see how often they change valves or replace pistons. i'm guessing they do it a bit more frequently than normal (flame suit on!) despite the cooler. the extra heat exchangers may help the oil cooling the cylinder walls and back of the piston shed just enough heat to keep many engines JUST this side of the high-wear heat zone, but i imagine there is a pretty quick crossover point........ > >"In small engine repair it states 1/3 heat is >conducted through cylinder walls, 1/3 for power >in the cylinder, 1/3 escapes in exhaust." > >Jeff - cross posting to T2 & T3 lists -- Craig K 70 Neunsitzer 65 Pritschenwagen "Guard against the impostures of pretended patriotism." -- George Washington ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org