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Re: [Healeys] BN2 front wheel cylinder size

To: Tadeusz Malkiewicz <tadeusz.malkiewicz@plusnet.pl>
Subject: Re: [Healeys] BN2 front wheel cylinder size
From: John Harper <ah@jharper.demon.co.uk>
Date: Mon, 5 May 2008 22:26:06 +0100
Tadeusz

You are right to query this because I maintain that due to an omission 
on the original Austin-Healey 100 Parts list this error has been 
perpetuated.

It will be extremely interesting to hear what others who read this say 
on this matter and see who agrees and who disagrees.

I will stick to BMC numbers but later I will give you the Girling 
equivalents.

My first piece of evidence came from the specialist in 100 spares at BMC 
Service where I was based at one time. Incidentally he also covered A70 
and A90 Atlantic. He was the one that all the spares departments around 
the world contacted when they had a query. In his master parts book he 
had marked in that with the introduction of BN2 the front wheel 
cylinders reverted to 1" 7H 4583/4. If one looks up the Girling part 
lists this is confirmed in most but I admit not all issues so clearly 
there was a level of inconsistency.

However it is worth noting that the 100/6 on wire wheels had the 7H 
4583/4 1" front wheel cylinder. As you know these brakes were the same 
as BN2. One could argue that the heavier engine might have some bearing 
on the issue but then the A90 Atlantic had 1" all round and so did the 
FX4 London Taxi.

The only odd man out was the later BN1 with larger brakes at the rear 
than the front. This was not an ideal design but brought about by 
pressure within the recently formed BMC to phase out the Austin Rear 
Axles.

My other 'evidence' is that having been involved to varying degrees in 
perhaps six or more BN2; I have always found that they were fitted with 
1" cylinders where they appeared original fit.

My last input is just to say that I have 1" on my own BN2 and the 
breaking balance appears to be just right.

Now I am sure that we will now receive a lot of comment. It will be your 
decision to listen to all the input and to make your own choice. All I 
will say is that whatever you choose; don't mix cylinder sizes on the 
front of your car.

Regards

 >7H4583           390332
 >7H4584           390333
 >7H4643           390321
 >7H4644           390320
 >
-- 
John Harper
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