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She who has no signature! cinscocom-tmw
QUOTE: Originally posted by Overmod I'd always thought the 'whoop' was due to the motor start -- you hear a similar noise when some types of electronically-controlled motor start up. Ed's right, you'll be startled when the compressor starts -- I get startled much more when the little condensate traps do their little bang-and-crackle routine (which I notice much more on GEs than on EMDs -- and which, I think, accounts for a more frequent cycling of the air pumps).
QUOTE: Originally posted by Mookie Another way to tell if it is GE or EMD when it is slowly coming around a blind corner! [:)]
Pump
QUOTE: Originally posted by UPTRAIN QUOTE: Originally posted by Mookie Another way to tell if it is GE or EMD when it is slowly coming around a blind corner! [:)] Hey Mook...you can also tell a GE from an EMD around a blind curve from all the backfireing and explosions.
QUOTE: Originally posted by jruppert Oh, I suspect cycling of idle speed may be to reduce the effects of long idling, which can cause varnishing of cylinder walls, but probably it it is more to do with temporary loads from auxiliary equipment.
QUOTE: Originally posted by Allen Jenkins Come to think of it...the whoop sound remindes me of the air solonoid starter, on a truck engine. Could it be, that there's a air starter just to get the compressor started? I know that the compressor is powered by an electric motor, but it takes alot of power to start a rotary piston compressor.
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