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Old 08-01-2018, 04:45 PM   #1
jhowes
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Default counter weights on the crankshaft

I called a machine shop that works on vintage engines to ask about putting counter weights oh my engine. He told me to go and buy a new counterbalanced crank to the toon of $1100 or so. I want to just get the bolt on weights and be happy but where do you get them and how accurate do they have to be mounted? Jack
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Old 08-01-2018, 04:51 PM   #2
Lawrie
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Default Re: counter weights on the crankshaft

Do a search, if you cant find anything let me know,I have a pile of stuff stored somewhere.
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Old 08-01-2018, 07:41 PM   #3
gustafson
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Default Re: counter weights on the crankshaft

They are both welded and bolted on usually. Installed by someone who knows what they are doing. They need to be extremely accurately mounted and then the crank balanced by a specialist. Not all machine shops have such balancing equipment.
You'll prolly end up paying the same amount. This is not a backyard deal


We already have a poster here with a brand new engine which was supposedly had the weights added to his crank, but there is a lot of vibration, so it is an easy guess that it was not done properly


Surely no one would try dropping the pan and bolting on the weights
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Old 08-01-2018, 07:53 PM   #4
Chuck Sea/Tac
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Default Re: counter weights on the crankshaft

Where are you located? There’s a guy near me that does it. Last one I had done was $450. I’m not sure if he’s still doing them or if he has any done as spec.
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Old 08-01-2018, 08:01 PM   #5
Chuck Sea/Tac
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Talking Re: counter weights on the crankshaft

[QUOTE=gustafson;1658334]They are both welded and bolted


We already have a poster here with a brand new engine which was supposedly had the weights added to his crank, but there is a lot of vibration, so it is an easy guess that it was not done properly. Quote


There could be many reasons for vibration, including poorly ground crank, unbalanced fly wheel and pressure plate.ect. Who knows , maybe an unbalanced piston. To blame the weights is kind of jumping to conclusions.
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Old 08-01-2018, 09:58 PM   #6
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Default Re: counter weights on the crankshaft

You are correct of course, and I believe those other possibilities may have been mentioned
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Old 08-01-2018, 10:28 PM   #7
J Franklin
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Default Re: counter weights on the crankshaft

The bolt on counterbalances I have heard about were for the model T.
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Old 08-01-2018, 10:32 PM   #8
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Default Re: counter weights on the crankshaft

I'd only use the ones that are shrunk on.
Even if they are not spot on when fitted, a lot can be done with a drill and a welder when balancing.
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Old 08-02-2018, 07:18 AM   #9
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Default Re: counter weights on the crankshaft

This is how they do it at Bert's Model A Center in Denver for the balanced engines they build. No idea of cost or if they sell the cranks separately.
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File Type: jpg berts1.jpg (58.0 KB, 154 views)
File Type: jpg bert2.jpg (74.1 KB, 147 views)
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Old 08-02-2018, 07:41 AM   #10
jhowes
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Default Re: counter weights on the crankshaft

The ones from Berts look so good that I might ship them mine when I am ready. I appreciate all of your comments and realize that this is not a shade tree mechanic job. Thanks again. Jack
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Old 08-02-2018, 09:03 AM   #11
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Default Re: counter weights on the crankshaft

Give them a call to inquire. The pics were from a visit I made there in late 2014.
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Old 08-02-2018, 10:24 AM   #12
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Default Re: counter weights on the crankshaft

Dan Price make some nice looking weights.
http://www.dan4banger.com/products.h...5-0e568a214d8e


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Old 08-02-2018, 10:39 AM   #13
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Default Re: counter weights on the crankshaft

In the past we have had the weights welded on, the person we used knew how to do it correctly. If done wrong, like body panel welding, you can warp the crank.
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Old 08-02-2018, 11:24 AM   #14
Kohnke Rebabbitting
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Default Re: counter weights on the crankshaft

These are the ones we started making in 1961, just don't have time any more.


Herm.
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File Type: jpg Our Model A Counter Weighted Crank 001.jpg (43.4 KB, 109 views)
File Type: jpg Our Model A Counter Weighted Crank 013.jpg (34.4 KB, 110 views)
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Old 08-02-2018, 07:27 PM   #15
James Rogers
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Default Re: counter weights on the crankshaft

I do it all the time at my shop.
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Old 08-02-2018, 10:01 PM   #16
Mark DeRoseau
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Default Re: counter weights on the crankshaft

James, I'm confused.... When I go to your website, it infers that you don't offer counter weights added to a crankshaft. It says, and I quote " why run a welded up, counterbalanced, 80 year old crank that is ground 10/20/30 or even 40 thousands undersized that cost up to $650 when for $1025 you can have a brand new crank"....... So do you offer the service, or just sell a new crank.... Just curious

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