I have torn down
> two 2.1L, both high  mileage and they don't seem to beat out the center
m=
> ain
> bearing as bad as the air cooled engines.  I guess I am unaware of the
cr=
> ank
> shaft whipping around and beating out the  #2 main with high rpm or other
> wise. Have I missed something?  I have had both my rebuilds dynamically
> balanced and feel it is well worth the expense.  They are both very
smoot=
> h
> and love high rpms.

Darrell,

Before I took my case apart I was planning the engine.  I talked with
Demello and others about counterweighting.  One said to do it another said
not to... But, when I took my case apart I saw that my center journal had
been moving around some and the case had some fretting.  I then talked to
Bob from Demello again and agreed that counter-weighting was necessary to
keep the crank from flexing.

It balances the mass from the pistons rotating. Smooths out the engine.

 True the 2.1L does not move as much as the bug case, But I have heard of
2.1L cranks breaking in the center and for $150 extra the insurance and
smoothing out of the engine was, IMHO worth it.  Plus with a stock four
speed tranny turning at 4000 RPMS at 70 it will help.

Plus, Why do High Performance engines have counterweight cranks?

Robert

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