Posted by ss55 on January 27, 2013 at 10:29:19 from (173.31.19.80):
In Reply to: runaway diesel posted by mikeman1 on January 27, 2013 at 06:33:55:
Has anyone tried to use a Jake Brake on an engine running at full power? Is there a pressure relief valve that limits the maximum back pressure?
When you restrict the intake air you only have to hold back 15 PSI of atmospheric air from entering the intake.
A diesel's compression pressure is around 300PSI? To completely stop a diesel engine running at full power by restricting the exhaust you would need to hold back maybe 300 PSI to 700 PSI of exhaust pressure. Odds are you would blow out some gaskets or split the exhaust system somewhere before too long. Exhaust manifolds would have to be fastened on like a cylinder head to prevent them from being blown off the engine. It might be made to work with a lot of effort, but it would not be nearly as inexpensive, light weight or reliable as restricting the intake.
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