[Fot] Al-Fin Drums

[Marcel Van Mulders]

In his book "Original Triumph TR2/3/3A", Bill Piggott writes about the Alfin
drums : '...it seems that they were frequently dealer fitted. They exist in
both 9in and 10in versions, with both lateral and circumferential finning,
lateral being the more common. They were manufactured by Wellwothy and Co
and were of cast aluminium with steel lining."
It seems that everybody is right. But if you come across the radial
(lateral) finned drums sold by Moss UKduring some years around 2002, don't
fit these on a race car. They had only small fins and are not very strong.
Nowadays they sell very good Alfin drums, with circumferential finning.
Marcel, Belgium
-----Oorspronkelijk bericht-----
Van: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Namens
BillDentin at aol.com
Verzonden: donderdag 6 maart 2014 16:09
Aan: TR3driver at ca.rr.com
CC: fot at autox.team.net
Onderwerp: Re: [Fot] Al-Fin Drums

In a message dated 03/05/2014 6:51:44 PM Central Standard Time,
TR3driver at ca.rr.com writes:


> Maybe we are getting confused over terms?  That description is what I 
> would call "circumferential" fins, meaning they run along the
> circumference (around) the drum.
> 
> Maybe the Datsun drums aren't all the same either?  The Datsun drums that 
> I have (actually aftermarket replacements) have fins that
> run the short way across the drum.
> 
I have 'vintage' 10" alfin drums on my early TR3 race car, and the fins run 
the short way perpendicular to the circumference.  I believe these drums 
were the after market variety which were available from TRIUMPH dealers back

in the day along with other competition options.  I also have reason to 
believe that they were made in Italy.  

Someone, Ken Gillanders I think, once told me that the 10" alfin drums that 
actually came from the TRIUMPH factory were very, very rare and perhaps as 
few as forty-eight sets were made.  That's pretty rare.  Ken, of course, has

a historically significant TR2 that set records as a drag racer.  It has 
10" alfins on all four corners, but I am unaware if they are that very rare 
TRIUMPH variety.  If Ken still monitors the list, maybe he'll chime in with 
some input.  

Bill Dentinger
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