RCU Forums - View Single Post - Balanced and Blueprinted

01-23-2010 | 02:19 PM

#25

DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: Balanced and Blueprinted

Quote:

ORIGINAL: blw

You can't balance a single-cylinder engine perfectly, but you can get it as close as possible.

Barry,

My point was that not only is a perfectly balanced single-piston engine unheard-of. 'As close as possible' is also a moot point - a far cry from reality...

As long as there is any reciprocating mass to balance, it will have to be counteracted with a rotating counter-balance; which essentially means no balance at all.
So, if you want perfect balance; out goes the entire reciprocating mass... No crankshaft counter-weight required either...

This is why I wrote 'single piston'. An imaginary zero-mass piston and con-rod will obviously never be.

If you can have a single-cylinder engine, with two counter-motion pistons; a perfect primary balance can be achieved... Engines like that do actually exist.
...But there is no way of converting our single-cylinder engines into them.

And trying to balance an existing engine 'as closely as possible to perfect', entails a piston that might fragment (like in the TT 1.30 - discussed here recently) and a similarly fragile con-rod...
I don't think anyone would want to go there...[X(]

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