In Reply to: Re: Sebring vs. BEGI for 1.9 posted by Shawn Fogg on April 03, 1999 at 19:44:25:
All compressors make heat (turbo or supercharger). It happens when you compress the air. The AutoRotor makes its compression internally, like a turbo charger. The Eaton unit compresses air between the valves and the rotors. As a result it looses efficiency due to turbulence. This turbulence creates heat. Heat causes detonation.
Detonation destroys engines.
The AutoRotor is more thermally efficient so the charge is cooler than the Eaton unit (they both elevate the temperature above normally aspirated engines). The addition of an intercooler will also reduce the temperature of the boost. The cost is a little pressure but you can also run a higher pressure as well with out significantly increasing the total charge temperature.
You probably will not see an increase in your temperature gauge due to the increased charge temperature. But your engine will feel it. Ever notice how much better your car runs on very cold days vrs hot days? You normally don't see any difference on you temperature gauge on those days but it does make a difference as far as your engine is concerned.