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Re: Supercharger

To: Max Heim <>, MG List <>
Subject: Re: Supercharger
From: Bob Shaw <>
Date: Sun, 10 Feb 2002 18:47:36 -0600
At 1:08 PM -0800 2/10/2002, Max Heim wrote:
>Well, the first question is, can you get pistons for anything more than a
>.060 overbore?
>Max Heim
>'66 MGB GHN3L76149
>If you're near Mountain View, CA,
>it's the primer red one with chrome wires

Yes. Pistons .080 and, if memory serves me correctly .083 are 
available. The .083 pistons are the pistons that give one the 1950 CC 
engine. I have never run pistons that large- I run the .060 pistons. 
I have spoken with some who do run such engines, and they tell me 
that they have no trouble, but that not every engine may be 
successfully bored to this size. Apparently they bore the engine to 
.080, and then if all is well, they hone the last .003 to arrive at 
the final bore. If the engine is not able to tolerate the .080 bore, 
one may re-sleeve the engine but is then limited to the .060 bore.

Again, this is second hand information. I have never done such an 
engine (yet). I can only attest to the .060 from personal experience, 
in the B engine I run in my A and the engine we run in my Wife's GT, 
and I have had no problems from this bore in over 30,000 miles.
There is a performance increase over the .040 bore. As always, YMMV.
Bob Shaw
Check out Shaw's Garage at
My British Car is NOT leaky - it's merely marking its territory.

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