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Re: Electronic to Mechanical Pump

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buickanddeere

04-04-2006 13:40:23

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Driving at 75MPH requires 1.33 times the power to overcome wind resistance than 65mph. Other additional drivetrain loses add up to yes indeed, dropping the mileage from 22 to 15. Some of the older mechanical era engines also used a simple egr valve if there was one used at all. If the egr is eliminated combustion efficiency is improved.

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jdemarisj

04-04-2006 20:15:31

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Re: Electronic to Mechanical Pump in reply to buickanddeere, 04-04-2006 13:40:23

I've got several with, and several without the EGR valve. On the diesels, it doesn't do very much. On a same year GM, a standard-duty diesel came with one, and a heavy-duty came without it. Often the one without the EGR gets worse mileage - but that's becasue once labeled "heavy duty" GM could turn the fuel up a bit and make some smoke - and get away with it. I've never noticed much difference between them in performance or mileage. In regard to the extra power and wind-resistance at higher speeds, of course that's true. But in addition, most diesels have a narrow efficiency band, much more narrow than for most gas engines. So, the extra RPMs outside of that efficiency curve help create a large fuel-mileage drop.

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