I use the one inch bore front cylinders on?our 100. Its an early BN2 and best
that I can tell had that size originally. I will say I have rebuilt or replaced
a bunch of them since buying the car in 1965.??
Aloha
Perry
-----Original Message-----
From: John Harper <ah@jharper.demon.co.uk>
To: Tadeusz Malkiewicz <tadeusz.malkiewicz@plusnet.pl>
Cc: healeys@autox.team.net
Sent: Mon, 5 May 2008 11:26 am
Subject: Re: [Healeys] BN2 front wheel cylinder size
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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