[Healeys] Maximum 2.6 Bore

[Patrick & Caroline Quinn]

G'day

 

I think it's an open ended question.

 

The engine in the BN3/1 is exactly the same C-series engine that Geoff
Healey was provided with by BMC way back in 1954 and was initially so
disappointed in as far as power goes. It is a C26W engine which means that
it was originally built for a Wolseley car. He then undertook quite a few
experiments on the engine in the car, including fitting triple dual throat
SUs before he was satisfied with the power. Sadly today I do not have those
SUs nor can I afford to have them built.

 

However when I bought the car back in 1974 it was fitted with standard 3000
pistons and I have all the service records going back to 1965. So sometime
between 1954 and 1965 it was bored out to take the pistons and ran perfectly
well through to Easter 2011 when it lost part of No 2 piston which means it
was not the fault of the block.

 

Watch this space.

 

Hoo Roo

 

Patrick Quinn

Sydney, Australia

 

From: Derek Job [mailto:derek.c.job at gmail.com] 
Sent: Tuesday, 30 April 2013 6:07 PM
To: Michael Salter
Cc: Patrick & Caroline Quinn; healeys at autox.team.net
Subject: Re: [Healeys] Maximum 2.6 Bore

 

Great article Mike. 

 

I'd like to provide a link to it in my 100-Six Web Site if that's Ok

 

Derek

www.healeysix.net

 

On Mon, Apr 29, 2013 at 11:51 PM, Michael Salter <michaelsalter at gmail.com>
wrote:

For those with further interest in this subject I have published a short
blog article here <http://www.netbug.net/blogmichael/?p=1130>.

Michael S


On Mon, Apr 29, 2013 at 7:57 AM, Patrick & Caroline Quinn <
p_cquinn at tpg.com.au> wrote:

> G'day
>
>
>
> Perhaps someone out there might be able to assist.
>
>
>
> The engine from the Quinn Austin-Healey (not the soft touring car with
> wind-up windows and a glove box, but the other one) is with the engine
> rebuilder.
>
>
>
> It is an early 2.6 litre C-series with a smooth sided crankcase. The
> standard bore of which is 79.375mm and according to a well known parts
> supplier cannot be bored out past +60 which would take it to 80.875mm.
>
>
>
> When I removed the cylinder head I thought the pistons looked a little
big,
> and sure enough the bores were measured today and they are 3.281 or
> 83.34mm.
> This is standard 3000.
>
>
>
> Number 2 cylinder is scored and will probably need to be sleeved.
>
>
>
> Has anyone had an experience at taking a 2.6 engine past its 'permissable'
> limit?
>
>
>
> Hoo Roo
>
>
>
> Patrick Quinn
>
> Sydney, Australia