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[Land-speed] Crankshaft balancing

To: "LandSpeed List" <Land-speed@autox.team.net>
Subject: [Land-speed] Crankshaft balancing
From: "John Burk" <joyseydevil@comcast.net>
Date: Sun, 13 Jun 2010 02:36:38 -0400
Your pistons and rods are heavier so you have the crank rebalanced to reduce
the uneven forces on the main bearings . But that's not what the shop did .
Treating the crank as a unit without knowing if the end counterweights are
compensating for an imbalance in the middle does nothing but minimize the
external vibration of the engine . No wonder race engines are sometimes harder
on certain main bearings . For a high rpm race engine I'm not sure
conventional balancing makes any difference at all . . Balancing a crank would
require scanning it , and letting the computer tell you where to add and
remove weight . Ok Fred , here's your crank , that'll be $7900 . Using a
rotating imbalance to compensate for a reciprocating imbalance is crude enough
to begin with .

John
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