Re: Purpose of the spring around the OD of brake drum ?
No No it’s to keep the cast iron from cracking under pressure and repeated heat cycles like the blocks. Unfortunately this never caught on with the block as there was a controversy as to wether they should be wrapped longitudinal or transversally and no one ever thought to do both.
Springs were for noise damping.
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Cheers,
Jim&Sandy
McGregor, IA
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