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If the marginal trombone "cooler" suffices, stay with it. If the engine overheats due to excessive oil temps., then improve the oil cooling. You've heard the solutions. Oil temperatures >250º may not affect a good oil. However, elevated oil temperature is a direct reflection of elevated engine temperature. When parts become too hot, they expand; sometimes beyond design spec. That's when clearances decrease and the oil film becomes too thin for adequate metal-to-metal separation.
I prefer the option of driving a car under most any operating circumstances - not just under "ideal" conditions. Anything less is considered domestic hot rod car philosophy and reveals a deficiency in car design or your modifications. Yep, PAG sometimes didn't foresee our operating conditions.
If the engine overheats in stop and go driving, don't avoid driving the car. Do what's necessary so you can drive it.
These seem to be truisms as they relate to air-cooled 911s:
- Airflow via a fan directed at an efficient oil cooler mitigates excessive heat buildup in most low-speed scenarios.
- A real oil cooler (w/airflow and adequate surface area and volume) does the job for high load, high ambient air temperatures.
- The exception are 3.6 engines. - they require multiple, efficient coolers or one very large one.
- A bumper-mount cooler, even a smaller one w/o a fan, is more efficient than a fender-mount cooler (again, due to airflow or lack thereof).
Sherwood
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