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| Message: | Eric, I am not the last word in 928 knowledge but, being a 74 year old geezer, I know some history on engine operating temperatures. When I did my own work back in the fifties and sixties, the rule was to use a 160 thermostat in summer and put in a 180 in the winter (to get more heat out of the heater). When the greenies started cracking down on the automobile emissions toward the end of the sixties, one of the first things that the automotive engineers did was to raise the engine temperature as well as putting exhaust manifold heaters on the carburetor inlet. Higher temperature causes more complete vaporization of the air-fuel mixture which, in turn, reduces emissions (but at the cost of performance which endeers the greenies to car nuts like me). That's why some of the folks on this forum are talking about cold air inlets. As far as I know, a 200 deg operating temperature should be perfectly acceptable. Incidentally, I have a S4 and it has a red zone on the temperature gage but no actual values. Your machine is a couple years newer and the engine is a little more powerful. However, everything I noted above should be applicable for a 200 degrees fahrenheit value. If, on the other hand, your reading is in centigrade, you are at the edge of boiling which probably is not a problem providing your expansion tank/radiator cap is secure and the system is pressurized. Hope this might help. | ||||
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