[SEL] The McVickerish Engine

[Elden DuRand]

Steve:

Hmmm!  The drawing on the patent you sent doesn't show the exhaust from the valve cylinder going anywhere but to the back of the cylinder when it gets to the top of the stroke.  That must have been added later.

I think I'll leave it out and just let the valve cylinder exhaust beneath the piston.  If there is an oil/crud buildup in the valve cylinder, I can probably get away with a very small hole that opens to the atmosphere right at the top of the valve piston stroke.  The hole would have to be very small to not interfere with operation of the exhaust valve system.

When I do the finalization of the exhaust valve mechanism, I'll have to come up with a way to seal the port pipes in the water jacket (I may just weld 'em in) and attach the checkvalve/piston part to these pipes.  I think I know how I'll do it but won't actually do the dimensioned drawing until I've cogitated on it a bit.

I would like to see the pics of your disassembled engine even though I probably won't do the diagonal exhaust valve and cage on my engine due to complexity.

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 Steve
> Royster
> Sent: Monday, March 22, 2010 07:24 PM
> To: The SEL email discussion list
> Subject: Re: [SEL] The McVickerish Engine
> 
> 
> 
> Hi Elden, I believe this is only a small port to 
> relieve the pressure from the lower exhaust valve 
> piston, I think the small piston  uncovers  the 
> port in the valve cage at the end of it's 
> downward travel and this small port lets the 
> small amount of pressure and  unburned fuel and 
> oil blow out the pipe to the man exhaust pipe. If 
> you hold your finger over the port when it fires 
> there is very little pressure coming from it.  I 
> have to take the cage off and replace the bolts 
> with studs soon and I'll take pics for you.   Steve
>  
> > From: edurand at mchsi.com
> > To: sel at lists.stationary-engine.com
> > Date: Mon, 22 Mar 2010 19:15:45 -0500
> > Subject: Re: [SEL] The McVickerish Engine
> > 
> > Steve:
> > 
> > I was looking at the photos again. Is the pipe 
> with the union on it that goes to the exhaust 
> port an actual ported exhaust setup? If so, the 
> exhaust valve actuating port must be ahead of the 
> exhaust relief port.
> > 
> > Disorganized (disordered?) minds need to know. :-)