www.motorpowerinc.com sells H20 pistons in .060 overbore for under $16
each. Assuming same stroke as U20, what would an .060 overbore give us in
terms of total displacement? I realize these are probably flattop pistons,
but that might be a good thing if we're cramming that much more stuff into
the compressed area...
At 04:35 PM 8/26/2002 +0000, Jim Cawrse wrote:
>This is IRT the crank grinding question
>Just like anything involved with horsepower, it depends
>on how much money you have. I know the 1600/2000
>stroker will live quite happily with .040 overbore, I would
>think this would be the road to go before
>fooling with the crank. I will have to get
>the formulas out to find out how much
>this gives, but would SWAG it at
>2100 or therabouts on a 2000 stroker.
>Plus, bigger piston
>squishing same combustion chamber means
>higher compression.
>Best Regards,
>Jim
>Chesapeake Va
>67 pushrod 2000/5spd
>72 510 sportwagon
>
>PS:
>SWAG equals
>scientific wild ass guess
>
> >From: "datsunmike" <datsunmike@nyc.rr.com>
> >Reply-To: "datsunmike" <datsunmike@nyc.rr.com>
> >To: "Andy Cost" <andycost@att.net>, <datsun-roadsters@autox.team.net>
> >Subject: Re: U-21
> >Date: Sun, 25 Aug 2002 16:29:51 -0400
> >MIME-Version: 1.0
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> >2002 13:35:17 -0700
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> >Message-ID: <002d01c24c76$2a5bb3e0$15385a18@nyc.rr.com>
> >References: <001301c24c69$ae84efe0$2b11530c@cost>
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> >How about just boring the motor. Nissan does make sleeves for the engine so
> >you can bore it as large as possible and install sleeves if the casting is
> >crappy or cylinder walls are thin.
> >
> > Cheaper and easier as you'll have to get custom rods also.
> >
> >Mike
> >
> >
> >----- Original Message -----
> >From: "Andy Cost" <andycost@att.net>
> >To: <datsun-roadsters@autox.team.net>
> >Sent: Sunday, August 25, 2002 3:00 PM
> >Subject: U-21
> >
> >
> > > Has anyone tried to offset grind a U-20 crank? My estimate is about
> >100cc
> >for
> > > each 1mm offset ground. What is the limiting factor here?
> > >
> > > Thanks,
> > >
> > > Andy
> > >
> > > /// datsun-roadsters@autox.team.net mailing list
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>
>
>
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Adam Bradley
'70 Datsun 1600 Roadster SPL311-28181
'67 Datsun RL411 SSS sedan RL411-11321
'66 Datsun PL411 sedan PL411-022447
http://www.picturetrail.com/abend
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