[SEL] The McVickerish Engine and video

[Reg Ingold]

Out of interest, the one I own has a double lobe cam, making it a normal 4 
cycle engine. It is original and could have been an export engine as they 
were sold for a while in Western Australia only. I know of only 3 original 
imports over here. I dont know about the cams on the others.
Reg & Marg Ingold
Newcastle.NSW  Australia
randmingold at hotkey.net.au
http://www.oldengine.org/members/randmingold

----- Original Message ----- 
From: "Larry Evans" <lfevans at pacbell.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Wednesday, March 24, 2010 12:58 PM
Subject: Re: [SEL] The McVickerish Engine and video


> Jim,
>
> The Aermotor's cam shaft has a gear four times as large as the crankshaft
> gear so the crank turns four times instead of the usual two times per cam
> shaft rotation of a typical four stroke engine.  The cam is shaped to hold
> the exhaust valve open all the time except during the firing cycle if the
> governor calls for it.  This was probably the company's way of doing away
> with a belt driven fan for cooling.  Another variation was the Gade air
> cooled engines that had an exhaust port at the bottom of the stroke to 
> dump
> the hot gasses out and then the exhaust valve allowed the final clearing 
> of
> the cylinder.  This also did away with the need for a cooling fan.
>
> Larry
>
> At 04:54 PM 3/23/2010, you wrote:
>>How did the Aeromotor hold the exhaust valve open for 5 strokes? Venting
>>the cylinder that way does make sense from a cooling stand point.
>>  Jim K.
>
> Larry Evans
> MailTo:LFEVANS at pacbell.net
> http://www.oldengine.org/members/levans/
>
>
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