[6pack] Modifying Finned Aluminum Brake Drums

[David Friedlander]

Thanks to all who responded to my finned drum question. Using the old iron
drum as a pattern for a machine shop is probably a good way to go....

Thanks, all.

Dave


On 2/12/2011 3:23 PM, Jerry C Shaw wrote:
> Hi Dave
> Keep warm up there. CT got a lot of snow, too, maybe more than Maine.
>
> In order to clear the backing plate, the 240Z drums need to be 
> machined and the diameter of the
> drum enlarged 0.080" on a side by 0.500" into the drum, and both the 
> center hole and the stud holes
> enlarged slightly. If you are a real stickler for detail, even the two 
> holes for the small flathead
> retaining screws may be accurately found by first mounting the finned 
> drums after you get them
> back, then placing an old iron drum backwards against the finned one, 
> using the wheel studs as
> locators, and carefully marking the hole locations with drill of the 
> correct diameter, but only
> kissing the aluminum to make the mark for final drilling.
>
> I suppose the machine shop could have done the small holes, too, but I 
> didn't think of it until
> I got home. It's probably just as accurate the way I did it.
>
> For awhile, TRF was selling modified Brembo drums. Maybe they still 
> do, but I purchased mine
> new off the internet and had a machine shop do the rest for about $70. 
> There were complaints
> of deep scratches caused by TRF's suppliers.
>
> See my car and these drums on
> http://www.triumphowners.com/977
>
> Jerry Shaw
> 1974 TR6 Mallard Green (newly restored)