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diesel_john · 10-07-2009, 11:44 PM

back in the 70's i deactivated the valves on two cylinders of my civic, and the mileage wasn't measureably improved. plus i had to drive in the truck lane.
I think the most efficient IC engines are the big bore, slow turning, compound turbo'd, diesels in trains and ships. around 30% Of course constant speed with electric drive trains not transmissions.
So one might infer that reving a smaller engine to high heaven to get enough power, probably won't help your efficiency. more fiction
and turboing a Geo to 15psi might shorten the life.

Chevy shuts down the same four cylinders all the time by collapsing the valve lifters and not energizing the fuel injector.

10-07-2009, 11:44 PM	#60 (permalink)
diesel_john MP$ Join Date: Jan 2008 Location: SW Ohio Posts: 595 Thanks: 5 Thanked 19 Times in 14 Posts	back in the 70's i deactivated the valves on two cylinders of my civic, and the mileage wasn't measureably improved. plus i had to drive in the truck lane. I think the most efficient IC engines are the big bore, slow turning, compound turbo'd, diesels in trains and ships. around 30% Of course constant speed with electric drive trains not transmissions. So one might infer that reving a smaller engine to high heaven to get enough power, probably won't help your efficiency. more fiction and turboing a Geo to 15psi might shorten the life. Chevy shuts down the same four cylinders all the time by collapsing the valve lifters and not energizing the fuel injector. Last edited by diesel_john; 10-08-2009 at 02:14 PM..