Hello Again
It appears that I am mistaking the Austin A90 cylinder head with that fitted
to the A70.
That font of all things Austin, John Harper tells me that the heads for the
100 and A90 were the same, but in earlier A90 applications the rocker
pedestals were taller which was accompanied with a taller rocker cover. Only
the 100 heads were fitted with double valve springs while the A90 were not.
John kindly advised that the A90 cylinder blocks were different, but as
mentioned only as to the distributor fixing.
Hoo Roo
Patrick
-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Simon Griffin
Sent: Monday, 8 July 2013 12:00 PM
To: healeys@autox.team.net
Subject: Re: [Healeys] BN1 Head
Thanks Patrick. From reading the book and other written sources I had the
distinct impression that the engine for the BN1 was exactly the same as the
A90, and that was one of the motivations for Leonard Lord to get rid of the
over supply of these engines? What had prompted the posting in the first
place was the Westlake patent casting on the head of my car. I had Googled
some A90 engine shots and it looks exactly the same as my car.
> From: p_cquinn@tpg.com.au
> To: simon_grif@msn.com; healeys@autox.team.net
> Subject: RE: [Healeys] BN1 Head
> Date: Mon, 8 Jul 2013 10:29:54 +1000
>
> G'day
>
> The cylinder head for the Austin A90 is different to that of the 100.
> So is the cylinder block.
>
> The 100 combustion chambers are far smaller and along with altered
> ports provide an improved gas flow, plus the thermostat housing is
> much bigger in the 100.
>
> Whether the A90 design was returned to Harry Weslake Engineering or
> not prior to casting is not known, but I would be surprised if it wasn't.
>
> Hoo Roo
>
> Patrick Quinn
> Blue Mountains, Australia
>
> -----Original Message-----
> From: healeys-bounces@autox.team.net
[mailto:healeys-bounces@autox.team.net]
> On Behalf Of Simon Griffin
> Sent: Monday, 8 July 2013 10:12 AM
> To: healeys@autox.team.net
> Subject: [Healeys] BN1 Head
>
> I have been reading Bill Piggott's book about the 100 and of course
> there are several references to Westlake being contracted to design
> the head for the 100M. However, is it not fair to say that Westlake
> designed the stock cast iron head on the BN1? Or I suppose if being
> honest he desinged it for the A90, not the AH. Poking around and
> photographing everything today, I note a Westlake patent number cast
> into the head just in front of the #1 spark plug.
>
> Simon
> Troy, Il
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