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Old 01-15-2020, 06:55 PM   #1
kenparker
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Default crankshaft counterweights

Who makes or offers counterweights that can be either bolted or welded onto the Model a crankshaft? ken
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Old 01-15-2020, 07:51 PM   #2
Synchro909
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Default Re: crankshaft counterweights

You guys are better off than we are for making those. They should be 5/8" thick but we have been metric for decades so 16mm is the nearest we can get. It's very close and most use it anyway. I had mine lazer cut. The design is VERY simple and involves only the cutting of 2 circles. I have the dimensions somewhere which I am happy to post if no one else posts them first.
One circle is the outside diameter of the weight and the other, the inner circle (where it goes on the crankshaft). The two circles don't have the same centre.
I'd be surprised if there is not someone who can do that for you nearby.
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Old 01-15-2020, 07:57 PM   #3
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Default Re: crankshaft counterweights

Schwalms Babbit does it as an exchange. If you call maybe the sell just the weights.
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Old 01-15-2020, 08:49 PM   #4
Bob C
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Default Re: crankshaft counterweights

Here's some. http://modelaparts.net/special.htm/c...ghtacrank.html
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Old 01-15-2020, 10:27 PM   #5
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Default Re: crankshaft counterweights

thankss guys. Iwill call piranios in the morning,.
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Old 01-15-2020, 11:31 PM   #6
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Default Re: crankshaft counterweights

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Berts also does it
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Old 01-16-2020, 12:39 AM   #7
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Default Re: crankshaft counterweights

Quote:
Originally Posted by kenparker View Post
thankss guys. Iwill call piranios in the morning,.
Let us know how it goes.
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Old 01-16-2020, 01:52 AM   #8
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Default Re: crankshaft counterweights

AER says if you buy their touring block it's:

NEW BURLINGTON CRANKSHAFT with touring engine add $800.00
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Old 01-16-2020, 08:01 AM   #9
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Default Re: crankshaft counterweights

Hi Synchro,
Could I please have the dimensions of the counter weights?
If you decide not to post them here, could you PM or email direct.
Much appreciated
Chris
cfm65@me.com
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Old 01-16-2020, 08:45 AM   #10
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Default Re: crankshaft counterweights

Gud mawnin' Syncro. I, too, would like the dimensions/pattern for the weights. either post them here are email to me , if you are a mid to. thanks. kenparker0703@yahoo.com
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Old 01-16-2020, 01:45 PM   #11
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Default Re: crankshaft counterweights

Ford sweated them on and pinned them. Model A cranks are dainty enough without welding on them. Dan Price may sell his counterweights separate but they might be a bit different than the factory B cranks. It seems like he uses thicker ones but I don't remember now
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Old 01-16-2020, 03:40 PM   #12
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Default Re: crankshaft counterweights

Here's some like the Ford add on ones. https://www.dan4banger.com/products.html
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Old 01-16-2020, 06:21 PM   #13
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Default Re: crankshaft counterweights

For those who asked for the dimensions, there are 2 way of doing it. They both use the same dimensions to cut out the blank. The first is cut from 1 1/4" thick material and part of the "ring" is milled away to give a counterweight like the ones Bob showed above (which I expect are made to these dimensions). The simplest ones are cut from 5/8" material (the same thickness as the round part of the crankshaft where they are mounted) Now for the dimensions:
  • Draw a straight line and put 2 centre points 1" apart on it. The line is the centerline of the finished counterweight's.
  • About one of the points, draw a 4" diameter circle. That becomes the hole that is later machined ready to be shrunk onto the crank shaft
  • About the other, draw a circle 6 1/2" diameter circle. That is the outside of the C/W
and there you have it - simple
For the thicker ones, the line where the extra metal is milled away is not at right angles to the centerline. It is about 12 1/2 degrees off and since the counterweights face both forwards and back, you will need 2 cut each way.
Attaching them to the crankshaft is up to you. A good shrink fit (allow 0.001 plus 0.001" per inch of diameter for shrink) should be enough but the comfort of a setscrew or bolt or weld as well is OK. If you weld, you might want to check the crank for straight afterwards.
IMO, the simple ones are enough. After all, there have been lots of Model As do lots of miles over lots of years with NO counterweights. A downside to the thicker weights is they will have to be removed if the crankshaft is to be reground at some later date.
PM me or ask on the forum if you have any ?s
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Old 01-16-2020, 07:36 PM   #14
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Default Re: crankshaft counterweights

Thanks Syncro for the dimensions. They are added to my notebook file of info I might need someday.
Now, for the goood part. A set of counterweight are on their way to me from Berts and I have a machinist friend on standby to attach them to the crank -some kind of trade out deal with him.
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Old 01-16-2020, 07:54 PM   #15
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Default Re: crankshaft counterweights

Quote:
Originally Posted by kenparker View Post
Thanks Syncro for the dimensions. They are added to my notebook file of info I might need someday.
Now, for the goood part. A set of counterweight are on their way to me from Berts and I have a machinist friend on standby to attach them to the crank -some kind of trade out deal with him.
I prefer the barter system to money too.
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Old 01-17-2020, 03:38 AM   #16
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Default Re: crankshaft counterweights

Thanks Synchro,
Much appreciated.
The measurements you gave are obviously for the “de luxe” ones.
Do you perhaps have the measurements for the simple ones as well?
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Last edited by Floats; 01-17-2020 at 03:14 PM.
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