Ted,
We are working on a TR6 for autocrossing, and have a set of 240Z drums
to fit. The center hole needs a few mils shaved off, and the retaining
screw holes must be drilled and countersunk (we will take them to a
machine shop rather than risk ruining them). The difference in weight
is significant (~5 lbs), especially considering this is unsprung weight
that affects handling more than extra weight on the car's chassis.
Hopefully the fins will help with cooling, but I can't imagine they
would be worse than stock. Besides, the rears aren't worked nearly as
hard as the fronts. Hopefully, the car will be on the road within two
months and I can report on actual use.
Joe Seward
'73 TR6
Theodore R. Stevens wrote:
>
> A fairly recent Grassroots motorsport article (on their web archives at
> <http://www.grmotorsports.com/boneyard.html>) suggests that aluminum finned
> brake drums from a Datsun 240Z is a worthwhile swap. Is the advantage
> merely better cooling? Are the finned aluminum drums significantly lighter?
> The article also mentions the Datsun drum centers have to be bored out.
>
> I know from my dad's experience with T-series MG's that the Al-Fin drums
> for them are very pricy. The 240Z drums are cheap enough that it seems
> every Datsun 510 being driven competitively has them on.
> ---
> Ted Stevens
> stevens@erols.com
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