hi compressions

[Robert J. Harris]

Remember the Reichstag

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From: Mark Pitts <saxon at zymurgy.org>
To: diy_efi <diy_efi at coulomb.eng.ohio-state.edu>; 'Woodd, Michael'
<wooddm at akcity.govt.nz>
Subject: RE: Re: hi compressions
Date: Friday, September 20, 1996 2:32 AM

Problem comes, trying to work out the shims, so that both stems are working
together, and not trying to compress two valve springs, by only pressing on
one stem.

Mark

Of course, you could take ancient history 101 and re-invent the rotary
valve
engine and eliminate valves in their entirety.  Basically picture a dual
overhead
cam with intake on one cam - exhaust on the other.  Shove it down so that 
part of the cam is in the combustion chamber. Make the cam relatively
large in diameter and hollow.  Put a hole in it such that at a certain
time,
the hole opens to the chamber.  Make the cams hollow and flow the gasses
through it to the machined ports.  No valves, just big timed holes,  no
springs 
so no float and very little friction.  This was down during the thirties by
the
way.  With modern ceramics and molycoatings, this concept slight might
have a chance again - a lot better than a two stems valve or oval valve. 

Side note - when and why was fuel injection invented???   Answer - 1920's 
so that high performance fighter aircraft could maintain sustained inverted

flight (upside down) without fuel starvation.  Perfected for narrow power 
and rpm range aircraft engines by end of WW II.