Ted :
My understanding is that the main reason for using them is the weight
savings (they are apparently allowed in VARA stock classes, as substitutes
for the factory Alfin drums). Since the Datsun drums are apparently not
Alfin (which refers to a trademarked method of bonding iron to aluminum for
improved heat transfer), they may not cool any better than the iron drums.
The 10" drums used on earlier cars would probably provide better cooling
than either 9" setup, but they are heavier yet (and apparently not
currently available).
Randall
On Monday, June 14, 1999 6:15 AM, Theodore R. Stevens
[SMTP:stevens@erols.com] 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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