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Originally Posted by bankspower
The higher the effective compression ratio, the greater the pumping loss. The good news is, no matter whether the pumping losses are high or low, these losses are mostly recovered on the power cycle. That’s why there isn’t any “compression braking”, as we’ll explain next.
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Seems to me they're actually saying "compression braking" is a bad term.
"Engine braking" usually refers to the overall braking effect of the engine & drivetrain, including frictional losses etc.
"Compression braking" usually refers to the specific component of engine braking caused by the pumping of the cylinders, which is usually the largest factor, and what varies between engine configurations etc. It's a bad term because the compression losses are recovered by rebound on the next stroke, and is actually caused by pulling a vacuum against a closed throttle on the intake stroke.
As diesels effectively have a permanently open throttle, they shouldn't have much engine braking at all. However everyone I've ever asked says that they do, so the theory goes out of the window at that point...
quick link to article:
http://www.bankspower.com/Tech_todaysdiesel.cfm
PS I don't know anything at all about slipper clutches
