I had a model diesel engine that did just this. Unscrew the screw for lower
compression when starting, then screw it in to the desired setting. It's was
only 0.25 Cubic inches.
-----Original Message-----
From: Toby Atwater [mailto:tob@taltec.net]
Sent: Thursday, May 13, 1999 3:46 PM
To: Sprite Mailing List
Subject: Re: CFR engine
>Alan Inglis wrote:
>>
>> I'm pretty certain that the CFR engine has a variable
>> compression ratio. How do they do that?
>
>It's a single-cylinder engine on which the cylinder bore is mounted on
>adjustable threaded rods. Turn the rods one way, the cylinder head
>moves up away from the crank and the combustion chamber gets bigger;
>turn them the other way, the cylinder head moves down and the combustion
>chamber gets smaller. Since bore and stroke remain the same, this lets
>them adjust the compression ratio *while the engine is running*. When
>it reaches a point at which it knocks on a particular fuel, that's the
>MON number for that fuel.
anybody ever think about making this into an engine? It would be kinda nice
to adjust your compression depending on gas
prices\performance\relaibility..... very intresting stuff. or maybe on
future engines, have the whole setup automatic, so you cant destroy your
engine even trying to make it knock. I always wanted to be an auto
engineer.....
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