[78-L] Fading sounds [fwd]

[Ron L'Herault]

Great description of how these things work.  I think they are usually bin?
Or Hopper? Cooled? -i.e.  one pours water in an open tank that rests on the
cylinder and it cools through evaporation of the water, right?

Ron L

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Jeff Lichtman
Sent: Monday, March 07, 2011 3:21 AM
To: 78-L Mail List
Subject: Re: [78-L] Fading sounds [fwd]


>I can recall gasoline-powered "threshing machines" thar worked the
>same way; the governor only allowed a spark when the speed had
>deopped below a given level. Thus. their sound was "bang" "whoosh,
>whoosh, whoosh, whoosh, bang!"
>
>Steven C. Barr

The governor on this type of engine (called a "hit and miss" engine) 
typically controls the exhaust valve, not the ignition. The intake 
valve opens by cylinder vacuum, not with a cam. The governor holds 
the exhaust valve open until the engine slows down to a set point, at 
which point it allows the exhaust valve to close. The cylinder pulls 
a vacuum on the next down stroke, which opens the intake valve and 
lets a charge in. The spark plug fires every other revolution 
regardless of whether there's a charge in the cylinder.


                        -        Jeff Lichtman
                                 jeff at swazoo.com
                                 Check out Swazoo Koolak's Web Jukebox at
                                 http://swazoo.com/ 

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