Berkeley CSUA MOTD:Entry 36486
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2025/04/03 [General] UID:1000 Activity:popular
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2005/3/2-3 [Transportation/Car] UID:36486 Activity:nil
3/2     For those interested in engine braking, check out Jake Brake:
        http://www.jakebrake.com/content.php4?doc_uid=114
        \_ This is impossible to retrofit into the standard overhead camshaft
           engine.
           \_ Yeah, it's mostly for big-rigs.
2025/04/03 [General] UID:1000 Activity:popular
4/3     

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Cache (465 bytes)
www.jakebrake.com/content.php4?doc_uid=114
When the piston passes over top dead center and begins its downward s troke, the energy is returned to the piston (and to the driving wheels). Essentially no energy is absorbed and no net retarding work is done. The energy required to compress this air is produced by the vehicle's drivin g wheels. Near top dead center, the Jacobs Engine Brake^ opens the exha ust valves, venting the high pressure air and dissipating the stored ene rgy through the exhaust system.