Quote:
Originally Posted by mpgmike
It seems to me that removing the throttle to reduce inductive pumping losses would be offset by the increased compressive losses. It was much easier to get the air in, but then the engine has to work harder on the compression stroke.
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The idea that higher compression leads to more engine braking is not true.
Air in a cylinder with a piston acts like a spring. Even if no fuel is being burned, the amount of energy to compress the air is nearly the same amount for it to uncompress and push the piston back down. This is why a lot of modern diesel engines have terrible engine braking without the aid of something like an exhaust brake.