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I had exactly to same problem with the same part/project with Pelican. Seems they don't read Wayne's book at bedtime ! Since they couldn't/wouldn't help I abandoned the attempt to upgrade the clutch. It would have been a nice profit for Pelican and they just couldn't be bothered to check with Wayne. Strange because in so many other ways Pelican are just great.I think they should hire you are their "oddball Tech question guy" !

"When I attempted to "Upgrade" my 986 "S" clutch disc with a Pelican sourced 987 "S" disc as suggested in the 101 projects book, I discovered the input shaft spline is different & incompatable. NoOne I could get on the phone was of any help. I suggested they ask SSF their supplier to compare the 2 discs side by side, but they wouldn't. Finally I had to buy a 986 disc & wait over the weekend to get it. A week after I first reported the problem Bob e-mailed me & said if I would send him the paperwork & explain the problem AGAIN, he would "look into it" Too lazy to ask any of his 3 co-workers I had already talked to! :mad:"

Quote:

Originally Posted by Gilles (Post 466226)

I believe that burning fuel, actually helps to keep the engine cooler, and a lean mixture will quickly overheat an engine (and put a hole on your piston..), this is a well known fact on aviation engines

Also believe that be cruising at top speed is much better for the engine than sitting in a traffic jam on the middle of the summer with the AC on and without proper airflow.

However, this conclusions are from my own observations and I am no an engine expert by any means...

Comparing mixture characteristics and rpm is apples/oranges--assume proper mixture for any useful discussion.

So, I had a 1984 BMW motorcycle with an oil cooler with a thermostat controlling whether oil circulated through it. The only time it did was during high-speed riding ... never in traffic. If you don't like "burning fuel" how about "doing work?" Conversion of fuel to energy is a heat-generating process. More energy (work) equals more heat. It takes a LOT of energy to push a car to 100 mph and virtually none to sit and idle.

As I previously alluded, many of us are conditioned to remembering old-time engines overheating when idling. That's NOT because they are generating more heat--it's because the water pump-mounted fan is turning at idle speed and doing next to no cooling. For our Boxsters, there's no such thing as "without proper airflow" because the fans are electric.

This is just basic physics, and there's also no way running faster is better for an engine than running slower--just as there's no way a tire lasts longer at low mileage versus high mileage. Just add up the total revolutions.