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How does a Jake-brake work?

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Posted by Corncob on November 19, 2002 at 13:24:54 from (

I always thought it had somthing to do with blocking the exhaust, but I recently heard that it's achieved by lifting a valve during compression stroke. If that's true, what lifts the valve? Also, if there is no power stroke, does that mean raw fuel is leaving the engine? I know it's a very small amount if it was though. Any help would be appreciated.

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