Crankshaft Balancing...Part II

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Tim Rogers
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Crankshaft Balancing...Part II

Post by Tim Rogers » Wed Jan 06, 2021 8:13 am

Thank you all for your great input on my original post! However, based on the advice given, am I to understand that this counterweighted crank cannot be successfully balanced statically? If so, why?


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<o><o><o><o> Tim Rogers - South of the Adirondacks - Forum member since 2013 <o><o><o><o>


Joe Bell
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Re: Crankshaft Balancing...Part II

Post by Joe Bell » Wed Jan 06, 2021 9:00 am

At least you pick the heavier one to weld the weights on to, I had an engine that came in with the Dunn's weight on it, had a bad vibration to it, sent it out for dynamic balancing, fired it back up and it still had it, removed the weights and rebalanced and it was gone???? I do not know if to much weight or in the wrong location? These where the after market ones not the originals? Just telling what I had found out years ago on one.


Scott_Conger
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Re: Crankshaft Balancing...Part II

Post by Scott_Conger » Wed Jan 06, 2021 10:48 am

Scott Conger

Tyranny under the guise of law is still Tyranny

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Les Schubert
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Re: Crankshaft Balancing...Part II

Post by Les Schubert » Wed Jan 06, 2021 11:06 am

Joe
I installed a set of the new Dunn weights more than 40 years ago on my 27 roadster. I labored over the installation to avoid any bending stress in the crank. I’ve been totally happy with it ever since. I think the fitting is the key

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Topic author
Tim Rogers
Posts: 387
Joined: Sun Jan 06, 2019 11:04 am
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Re: Crankshaft Balancing...Part II

Post by Tim Rogers » Wed Jan 06, 2021 12:33 pm

Thanks Scott- I believe I understand now.
<o><o><o><o> Tim Rogers - South of the Adirondacks - Forum member since 2013 <o><o><o><o>


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Re: Crankshaft Balancing...Part II

Post by Harry Lillo » Thu Jan 07, 2021 8:34 pm

Just got my balanced rotating engine assembly back from the machine shop.
The stock crank was previously balanced by itself.
The magnets were weighed and placed to best statically balance (offsetting weights).
It came back with five drilled 3/8 drilled holes. The deepest was about 1/2 inch.
Three were adjacent to each other but one was about 30 degrees over.
Harry


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Re: Crankshaft Balancing...Part II

Post by David Fuls » Sun Jan 10, 2021 1:56 pm

Tim, This was easier for me to understand. http://www.antiqueautoranch.com/montana ... page4.html

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