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      05-08-2012, 01:33 PM   #11
JamesM3M5
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Drives: E28 M5, E92 335i
Join Date: Sep 2011
Location: Northern VA

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Quote:
Originally Posted by 335okc View Post
big picture: oil cools engine, coolant cools oil
That's not exactly correct - oil temp should be kept in check to ensure proper viscosity. Too cold or too hot is bad. The coolant system cools the block and head, and oil to a lesser extent cools the reciprocating mass in the block, i.e. crank, pistons, rods, etc. Plenty of engines (lower HP engines) run fine on track without oil coolers even in race applications. If the temp doesn't exceed 240F, you don't really need an oil cooler.

Our engines, however, put out gobs of power for their size, and you need augmented water and oil cooling to prevent limp mode (which in turn prevents major failures) under track conditions.
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RRT Racing
E92 335i/6MT Dinan Stage 3: intercooler, oil cooler, intake, flash, exhaust, LW dual-mass flywheel.
Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350