[Healeys] Maximum 2.6 Bore

[Michael Salter]

Hi Patrick,
I have had experience of a 2.6 liter engine having been bored to 3000 bore.
It doesn't work. In one of Geoff's books mention is made of the block
casting having been changed to produce the larger cylinder bore. The
attached photos are of the remains of a 2.6 that had been bored to 83.34mm.
It ran well....for about 20 minutes..
A customer had purchased it as a "race ready" engine...

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
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-- 
Michael Salter

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