Remember, in my original note, I said I was NOT converting to discs.
That includes a "stealth" disc.
I think the way they were made originally was by a shrink fit. The steel
or Iron liner also has integral pegs that go thru the Aluminum, then get
mashed to effectively become a rivet. Pegs inserted into holes in a liner
would certainly generate cracks, as John Harden described. The other
thing I believe the manufacturer counted on was the Galvanic action of
the dissimilar metals cementing the two together. I shudder to think what
the Aluminum will look like when the liner is cut away.
I highly doubt the liners were made of water pipe. There would be a seam.
I also think cast Iron would be too brittle.
Brian Evans wrote:
>
> I saw a neat thing on Speedvision while couch-potatoing on the weekend. A
> nice drum brake kit designed to house a modern disc brake setup - the whole
> disc/caliper fitted inside the drum, which was vented to allow for
> cooling. Perhaps this is an alternative to getting drums re-lined - which
> can be done by fully machining out the old lining, turning up a new one and
> having it pressed/shrunk into the ally drum. Key would be finding a
> machinist who knows enough about the different rates of expansion of the
> materials to get the right mechanical interference fit. The material is
> probably cast iron rather than steel. I wouldn't be at all surprised if
> originals were lined with off-cuts of cast iron waterpipe of suitable size...
>
|