[AT] another Cub engine question

[Jim Becker]

My understanding is that at least some versions of the Cub Power Units used 
counterbalanced crankshafts.  I have never seen one first-hand.  The Palmer 
Marine engine that used the Cub engine had a counterbalanced crankshaft. 
The Palmer crank has other differences that prevent exchanging with tractor 
or power unit crankshafts.

Jim Becker

-----Original Message----- 
From: Greg Hass
Sent: Tuesday, July 07, 2020 12:31 PM
To: at at lists.antique-tractor.com
Subject: [AT] another Cub engine question

I have a "49" Cub and for 33 years we used an IH 64 combine with a Cub
power unit. I always wondered how the power unit could run that
combine.  Several years after we no longer had the combine I bought my
Cub; well, it always sounded different than the power unit. A while
later I came across the manual for the power unit and while looking
through it I saw it was listed as running at 2900 RPM as opposed  to
1800 RPM for the Cub which explains the power difference.  My question
is this; I talked to a guy a couple of towns over that dealt with only
old IH equipment. He seemed very up to date on Cubs and he claimed that
because of the higher RPM's the Cub power unit had a balanced crankshaft
as opposed to a standard crankshaft in a Cub tractor. Since then I have
always wondered if that is true and if someone on this list has the answer.
          Greg Hass