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Re: OT, what are exhaust brakes?
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Posted by Bob on November 21, 2001 at 10:46:16 from (209.94.172.42):
In Reply to: OT, what are exhaust brakes? posted by Poppin' Johnny on November 21, 2001 at 09:08:41:
The basic idea behind a jake brake is to use the engine to provide braking power. A jake brake goes a step further, and actually turns the engine into an air compressor to provide a great deal more braking power. Compressing the air in the cylinder takes power. If the engine's drive shaft is turning the engine to brake the truck, the power used to compress the air is braking power. However, that power is stored in the cylinder, so if you let it the compressed air simply pushes the piston back down. Therefore you don't really get any braking at all from the compression stroke on an unmodified engine. A jake brake modifies the timing on the exhaust valves so that, when braking is desired, the exhaust valves open right as the piston reaches the top of the compression stroke. The energy gathered in the compressed air is released, so the compression stroke actually provides braking power.
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