In a message dated 3/08/01 7:51:27 AM Pacific Standard Time,
alan_costich2@non.hp.com writes:
> I'm building a 1840 MGB motor for vintage. I had hoped to use Jahns flat
> topped pistons that are forty over.
>
> Saddly, the machine shop I'm working with just informed me that of the five
> pistons I gave them, two have a compression height better than .0625 too
> short.
>
No big surprise with Jahns. The one thing they did usually do was make a
fairly thick crown (and also heavy) piston. You could machine the other
pistons to suit and then adjust deck height by shaving, although you really
shouldn't have to, and theoretically it's nice to maintain deck rigidity.
Are they new pistons - can you just send them back?
If you are serious about the engine, you might want to try Ross Racing or one
of the others that make a quality forged piston.
Bill S.
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