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Date:         Wed, 1 Dec 1999 22:47:15 -0600
Reply-To:     John Rodgers <inua@SCOTT.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <inua@SCOTT.NET>
Subject:      Engine balancing
Content-Type: text/plain; charset=us-ascii

Can anyone explain to me the process/procedure for balancing the internal parts of an engine....pistons, rods, etc, and dynamic balancing of the entire rotating assembly.....pistons, rods, crank, flywheel and clutch plate. How do they do that on automotive engines? Do machine shops literally grind a little material off the piston skirts or some other place until the pistons match the lightest one in the bunch? Is it similar for rods. Where is the typical location to remove material? What considerations must be given in each case? How would one balance a crankshaft? And where would the metal be removed? And what do you look out for?

Years ago I used to balance cranks and aircraft propellers some. The cranks would be put on a knife edge device and if something was not right it would roll right over with the heavy side down. Propellers same way. A stub shaft was mounted through the hub assembly an the whole thing set on a knife edge. It would always rotate to heaviest side down. In some of the propellers you would add lead wool to hollow bolts to get the balance right, or add or remove lead washers in certain parts of the propeller.

But i have no idea how it is done in the automotive world.

Any input would be appreciated.

Thanks,

John Rodgers "88GL driver wannabe


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