Hi Paul,
 Have you people seen or discussed the Revetec engine. I just found out
 about
 it. Very interesting and different. www.revetec.com

 Dale Davies


 Cam engines are nothing new. They have a serious mechanical flaw called
 line
 contact. The principles of this company are either ignorant
 or stock scam artist. I suspect the later.

 Paul Lamar


 The minute a "new engine" company promotes how it will create carbon
 credits....
 I'd say 'scam'

 http://www.revetec.com/carbon1.htm

 Tom

 I agree. Al Gore has made 50 million bucks off carbon credits so far.
 He was so slick he took in the Nobel Peace Prize presenters lock
 stock and barrel not to mention the rest of the worlds governments
 including our own :)

 Paul Lamar

 I say there is an opportunity for us rotorheads to find ways to
 "greenize" rotaries and sell carbon credits to fund future
 R&D....hummmmm. Sign me up for that one.

 Barry in Atlanta



 Paul, different is a good description, I could see it as a lowspeed deisel
 or prefferably a steam engine where it would be a 2 stroke. Twenty years
 ago I built some lumber stacking machines with a desmodronic drive driven
by
 a single hyd motor.It had 1 limit switch and a photoswitch and one two
 position hyd valve.Ultimately the lack of any way to add a programable
 computer which could do anything but a start/stop button when that was the
 new industry trend resulted in ow production. It was however bulletproof
and
 very low maintenance.My personal favorite of the 27 different stackers I
 designed over 30 years.The revtec above could be scalled up to very large
 sizes as a steam engine to power electric generators in remote areas with
 better heat recovery than the steam turbines.

 george grimes

I used to dream of different types of Cam type engines when I was a kid.
I never did anything with them, but what is "Line Contact" and how
is it a serious flaw?

Kevin in Denver

All successful internal combustion engines use journal bearing that
distribute
the combustion and inertia loads over a wide area of the crank pin.

A cam engine has a line contact between the connecting rod and the crank.
This leads to severe contact stresses in both parts. The Dynacam engine is
a good example.

http://www.dself.dsl.pipex.com/MUSEUM/POWER/unusualICeng/axial-ICeng/axial-IC.htm
http://en.wikipedia.org/wiki/Swashplate_engine

Paul Lamar


Paul,
That really doesn't explain what exactly "line contact" is or how it's a
flaw. Could you educate us in the matter?

Vladimir

Think of a cam contacting a valve lifter. There is a narrow line where
they make contact. The larger the area of the contacting parts the lower
the stresses. If the line is .001 inches wide and two inches long the
area is only .002 square inches. With 1000 pounds of force
from the piston the compressive stress would be 500,000 PSI.
The surface would soon fatigue and start breaking up. Just like
what happens with a heavy truck on a paved highway.

Paul Lamar