[SEL] The McVickerish Engine and video

[Kangas, James G.]

Elden,
I looked up the patent to better understand the design. After reading the patent I wonder if McVickers took his inspiration from a gas operated semi-automatic gun. In both cases high pressure gas is used to operate some part of the mechanism
   Jim K

________________________________

From: sel-bounces at lists.stationary-engine.com on behalf of Elden DuRand
Sent: Wed 3/24/2010 9:44 AM
To: The SEL email discussion list
Subject: Re: [SEL] The McVickerish Engine and video



Jim:

I watched the video and I see at least two variations the McVicker engine went through.

The one I'm basing The McVickerish Engine on is what I think is the original idea, covered in the patent, where there were no eccentrics, cams or gears and the exhaust valve was operated exclusively by cylinder overpressure.

I could be mistaken, though.  The earlier engine could be the one with the eccentric (cam?) on the crankshaft where overpressure simply shoves the pushrod up so the exhaust valve can operate after a power stroke and McVicker could have called his camless version the "improved" model.

Take care - Elden
http://www.oldengine.org/members/durand

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Kangas,
> James G.
> Sent: Tuesday, March 23, 2010 02:21 PM
> To: The SEL email discussion list
> Subject: Re: [SEL] The McVickerish Engine and video
>
>
> That explanation finally makes it clear to me,
> Thank you again Elden
> I can across this video of a McVickers that seems
> to be different then the one you're building
> http://www.youtube.com/watch?v=cB-_yxULB4s
> 
> Jim K
>
> ________________________________
>
> From: sel-bounces at lists.stationary-engine.com on
> behalf of Elden DuRand
> Sent: Tue 3/23/2010 9:54 AM
> To: The SEL email discussion list
> Subject: Re: [SEL] The McVickerish Engine
>
>
>
> Jim:
>
> Unlike Diesel exhaust brakes, the McVicker engine
> is not working as a true compressor when it is in
> "miss" mode.  The mixture is compressed and
> expanded, acting more like a spring - taking
> energy on compression and giving (most of) it
> back on expansion.


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