Further to this point, accentuating the recessing, the mating surfaces of my
Minilite look-alikes (Shelby/American/Western-type) are relieved (counter-sunk)
around the centers, probably as a one-application-fits-all measure.
- Bob
Marc Sayer wrote:
>
> RWM wrote:
> > Adam's correct. The hub is recessed. Well, mine are.
> >
> > - Bob Mann
> >
> > Adam Bradley wrote:
> >
> >>This answer doesn't quite make sense to me. IIRC, the drum fits fairly
> >>tightly on the studs, then even tighter over the shoes. The hub never
> >>protrudes through the drum to center it. However, with the larger 12mm
> >>studs, the stud holes are probably larger on a 240z drum.
> >>
> >>What is the advantage to running 240z drums? Could you use 510 drums,
> >>since they use essentially the same shoes?
> >>
> >>At 02:48 PM 5/28/2002 -0400, Peter Long wrote:
> >>
> >>>Marc sent me this response to my question - I had not thought of this.
> >>>
> >>> Has anyone done the appropriate machining of a 240Z drum hub opening,
> >>>to make it work on a roadster? Any recollection of just how much bigger
> >>>the hole needs to be?
> >>>
> >>>Thanks again
> >>>
> >>>Pete Long
> >>>
> >>>
> >>>--------------------------
> >>>
> >>>The center hole in the Z drums is much smaller than the Roadster drums.
> >>>While I've never acutally tried a set of Z drums on a Roadster, I doubt
> >>>the center hole will fit over the hub. I also belive that both car's
> >>>drums are what's known as hub-centric, that is the center hole fits
> >>>tightly over the hub to center the drum properly. That means to used a
> >>>drum you would have to have the center hole remachined to fit the
> >>>Roadster hub exactly. It would need to be precise and acurate machining
> >>>and not just sloppy clearancing work.
>
> Well as I said I haven't actually tried using Z drums on a Roadster, I
> was just pointing at an area to be concerned about. I thought I
> remembered the Roadsters also being hub-centric. I know the Roadster
> drums will not work on a Z or 510 because the center hole is too large.
> This lead me to consider that the reverse might also be true. If the
> studs center the Roadster drum, and the hub does not protrude out from
> the mounting surface at all, then the Z drums might well work as far as
> that goes. Then you have to look at stud size, because if the hub
> doesn't center the drum, the studs do. Hub-centric is a much better
> method of centering the drum, and I am surprised Datsun didn't use it on
> the Roadsters.
>
> Z and Roadster drums are both aluminum clad, while the 510 drum is all
> iron. Both the Z and 510 are hub-centric and have the same smaller
> center hole size compared to the Roadster.
>
> --
> Marc Sayer
> 82 280ZX Turbo
> 71 510 Trans Am vintage racer
>
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