Posted by Bob on October 28, 2007 at 19:18:56 from (69.178.229.154):
In Reply to: Interesting project posted by poogie on October 28, 2007 at 18:57:55:
With an open valve, you would loose more from "pumping losses"... moving the air in and out of the cylinder than you would lose by keeping the exhaust valve CLOSED.
With the valve CLOSED, the air is compressed, then springs back. With the valve working, you are PUMPING air. (Think "Jake Brake.")
Take a look at how the Goat's 318 or the General's 5.3 "displacement on demand" engines operate... lifters are made to collapse under control of the 'puter, so the valves remain closed, and also fuel injection to the "shut down" cylinders is stopped.
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