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Old 10-18-2020, 08:31 PM   #1
BillyBobsSpeedShop
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Default Opinion on running Mixed match rear drums

I am working on a project and currently in the process of assembling my rear end. I currently have a very good condition stamped steel rear brake drum and hub assembled together that is measuring .141 thickness. I also was able to find another complete drake drum and hub from a local Model A'er that is from a late 1931 and is the cast drum in really good condition as well. So my question is what issues should i be concerned with running a stamped steel drum and a cast drum on the rear? Or should i be good?

I started this venture with purchasing a set of cast drums and went down the path with having a local machine shop install them on my hubs. Unfortunately that process did not go so well and both drums cracked during the install process and are not good.

Thanks
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Old 10-18-2020, 08:53 PM   #2
CWPASADENA
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Default Re: Opinion on running Mixed match rear drums

It is not the best idea in the world.

Definately not recommended for the front.

My opinion

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Old 10-18-2020, 09:03 PM   #3
BillyBobsSpeedShop
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Default Re: Opinion on running Mixed match rear drums

The project I am working on is a modified T with the Model A rear so I am not planning on running front brakes.
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Old 10-18-2020, 09:09 PM   #4
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Default Re: Opinion on running Mixed match rear drums

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Originally Posted by BillyBobsSpeedShop View Post
The project I am working on is a modified T with the Model A rear so I am not planning on running front brakes.
In that case, definitely NO. You will get more braking with the cast drum than the steel one. I'm sure you would end up turned around so quickly, you'll end up looking at yourself. Using miss matched drums like that is, IMO a scary prospect. You did the right thing to ask before you did it.
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Old 10-18-2020, 09:17 PM   #5
BillyBobsSpeedShop
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Default Re: Opinion on running Mixed match rear drums

I figured much with rhe cast braking sooner than the stamped drum. Thanks
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Old 10-19-2020, 12:16 AM   #6
Synchro909
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Default Re: Opinion on running Mixed match rear drums

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Originally Posted by BillyBobsSpeedShop View Post
I figured much with rhe cast braking sooner than the stamped drum. Thanks
It's not a matter of braking sooner - that can be adjusted. The cast drum has a higher co efficient of friction with the brake shoes that the steel one and so, will skid before the other one. Two wheel brakes with one locked up would be............ exciting.
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Old 10-19-2020, 01:22 AM   #7
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Default Re: Opinion on running Mixed match rear drums

your life and that of others is worth far more than the few dollars you would save !
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Old 10-19-2020, 03:40 AM   #8
Dodge
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Default Re: Opinion on running Mixed match rear drums

That machine shop should be buying you a pair of cast iron drums. They should have stopped when they cracked the first one.
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Old 10-19-2020, 08:05 AM   #9
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Default Re: Opinion on running Mixed match rear drums

No, no, no, not even a bad idea.

Enjoy.
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