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Re: 4.6 Piston Specs

To: Buick-Rover Mailing List <buick-rover-v8@autox.team.net>
Subject: Re: 4.6 Piston Specs
From: Franc Buxton <fab@dcs.warwick.ac.uk>
Date: Thu, 08 Mar 2001 15:55:49 +0000
lmg@gomog.com wrote:
> 
> >         I would like very much to learn these specs also.
> >
> > Dave Kernberger
> >
> > ------------------------------------------------------
> >
> > >Anybody have the specs on the 4.6 pistons?  Compression height, pin
> > >diameter, dish CC's?
> > >
> > >Greg
> 
> This is what my books have
> 
> The 4.6 has a cylinder bore of 95mm and a stroke of 82mm. The piston
> crown is 22.93cc with a piston height of 66.6mm and a compression height
> of 35.9mm. The big end rod diameter is 55.5mm and the small end is 24mm.
> 
> Lorne
> 

        There's not much I can disagree with there, Lorne! :>) - except
that the piston diameter is definitely 94.00mm, to fit in a bore of
94.04mm. I can add that _at least some_ 4.6 pistons have an offset gudgeon
(wrist) pin, and so _must_ be fitted the correct way round. I know people
who have learnt that the hard (expensive) way...

        The rest of the info is, as far as I can check with my sources,
correct. (I seem to have made a habit of contradicting everything Lorne
contributes recently, for which I hope he'll forgive me!).

        Regards,
                Franc.
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