Here is a novel way to increase engine efficiency;
http://www.sciencenews.org/sn_arc98/2_7_98/timeline.htm
ENGINE MAY SAVE MILLIONS
American automobile owners can save $400,000,000
annually by using engines that operate at a constant
instead of a variable pressure, Prof. H.M. Jacklin of
Purdue University has reported to the Society of
Automotive Engineers.
Present auto engines operate so that the volume of the
gaseous fuel exploded is constant. Prof. Jacklin’s
experiments were made upon an experimental engine
constructed with a movable cylinder-head that was used
to reduce the volume of the cylinder as the speed of
the engine decreases. This maintained the same
pressure within the cylinder at all speeds. No
adjustment of spark was necessary.
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