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Minifin Brake Drums


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#1 Fastorq

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Posted 15 November 2018 - 08:17 PM

Hi
Where can I buy Minifins that don’t have the cast in spacer.
Ie original design Minifins

Cheers
DavidR

#2 Spider

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Posted 15 November 2018 - 08:25 PM

I'm pretty sure no one is currently making them, only the Super Mini Fin varieties, that have the built in spacer.

 

Unfortunately, the way the spacer is cast on these, they don't lend themselves to being machined either.

 

So, you're only option will be second hand with all the usual places to look.



#3 DeadSquare

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Posted 15 November 2018 - 09:08 PM

Have a care, buying old used Minifins.

 

They have a nasty habit of warping, which is very hard to ascertain before they are fitted.



#4 Bobbins

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Posted 15 November 2018 - 10:46 PM

Is the cast-in spacer the same thickness as the late model standard drum?

#5 mab01uk

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Posted 15 November 2018 - 10:51 PM

Here is an original Minifin ad leaflet:-

http://www.theminifo...hive/?p=2616928



#6 Daz1968

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Posted 15 November 2018 - 10:55 PM

The current ones are same as later spacered drums, however if you do want some standard mini fins they are about as I purchased a pair for rear of my 998 cooper, but unless you are restricted by wheel offset like I am with my 7 inch front discs then you can use the spacered ones with correct offset wheels.

#7 Fastorq

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Posted 16 November 2018 - 11:04 AM

Here is an original Minifin ad leaflet:-
http://www.theminifo...hive/?p=2616928


Love those old ads
I’m going to look at a pair I’ve found advertised locally.
Hope they are originals and not copies with spacers.

#8 Ricewind

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Posted 08 July 2019 - 03:48 PM

Can Minifins be used on twin leading shoe front brakes as well?



#9 kit352

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Posted 08 July 2019 - 04:23 PM

I would love to find a pair without the spacer. Been looking for months and haven't even heard a whisper about some bring available.

#10 Spider

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Posted 08 July 2019 - 07:06 PM

Can Minifins be used on twin leading shoe front brakes as well?

 

Yes and it was a popular modification 'in the day'. While drum brakes aren't too bad, fitting these drums does improve them.



#11 carbon

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Posted 08 July 2019 - 09:04 PM

 

Can Minifins be used on twin leading shoe front brakes as well?

 

Yes and it was a popular modification 'in the day'. While drum brakes aren't too bad, fitting these drums does improve them.

 

Makes the 2LS brakes less prone to fade, but still a heavy push needed to get it to stop quickly.

 

In my experience 2LS needs quite a bit more pedal effort than 7.5 discs without servo.



#12 Ricewind

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Posted 10 July 2019 - 05:05 PM

 

 

Can Minifins be used on twin leading shoe front brakes as well?

 

Yes and it was a popular modification 'in the day'. While drum brakes aren't too bad, fitting these drums does improve them.

 

Makes the 2LS brakes less prone to fade, but still a heavy push needed to get it to stop quickly.

 

In my experience 2LS needs quite a bit more pedal effort than 7.5 discs without servo.

 

In the late 70'sI had a 850 Mini van on low profile 10" tyres that had a remote servo and 2LS. I soon took the servo off as it was far too sensitive. Some lightweight kit cars use disc brakes without a servo by using a clutch master cylinder which has a smaller driving piston. I did this trick on my last Berkeley that had metro callipers, I found it more controllable than having a servo, trying to apply a gentle force to servo assisted brakes when you are bricking it in a situation can be difficult. This trick of using a smaller driving piston could be used with drum brakes but with extra leverage comes longer pedal movement, which is less forgiving of poorly adjusted brakes, spongy rubber brake hoses or any unwanted air in the system.


Edited by Ricewind, 10 July 2019 - 05:08 PM.


#13 carbon

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Posted 10 July 2019 - 05:56 PM

The standard single line 'tin can' brake master cylinder for drum brakes has 0.70 inch bore.

 

I'm curious, thought the clutch master cylinder was either 0.70 or o.75 inch bore, not smaller than 0.70 inch?


Edited by carbon, 10 July 2019 - 05:57 PM.


#14 Spider

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Posted 10 July 2019 - 07:04 PM

I think the " to servo or not to servo " comes down to the shoe friction material. Certainly some of the harder competition material may be wanting a servo.



#15 Ricewind

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Posted 11 July 2019 - 08:14 AM

The standard single line 'tin can' brake master cylinder for drum brakes has 0.70 inch bore.

 

I'm curious, thought the clutch master cylinder was either 0.70 or o.75 inch bore, not smaller than 0.70 inch?

Thinking about it, it may not have been off of a Mini clutch master cylinder as I think the one I used was off of a Jaguar. I seem to remember that the brake pipe had to be adapted to fit the larger thread size on the master cylinder.

 

 

I would love to find a pair without the spacer. Been looking for months and haven't even heard a whisper about some bring available.

I would get the ones with the spacer and, if suitable machine off the unwanted amount of material.   






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