I figure downshifting with some throttle to keep going the same speed, is down shifting.
Down shifting with no throttle, to slow down. Would be compression braking.
Quote:
Originally Posted by BlueRaven
Anyone please feel free to correct me if i'm wrong. I drive tractor trailer on occasion and if i recall correctly from my course 9 years ago engine braking when turned on in a rig , you can choose 2 or 4 cylinders , retards the # of cylinder chosen. In other words these cylinders do not fire and slows down the engine faster than it would normally which make the brrrrrrrrrr noise when you let go of the fuel pedal. I know i have a hard time explaining things. If anyone can make this clearer please do.
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You mean Jake brake?
http://en.wikipedia.org/wiki/Jake_brake