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.
--Scott
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