I mixed and matched. U20 rods and H20 pistons and crank.
I used H20 pistons because my head has been cut and from what others wrote
who are using U20 pistons they can cause the CR to skyrocket. I'd rather
have a little less HP and more reliability and no running problems.
I went 30 over to recoup some compression.
The H20 pistons are also much cheaper. I bought federal mogul pistons and
they were within 1.5 grams of each other which isn't bad.
Mike
----- Original Message -----
From: "Adam Bradley" <ambradley@yahoo.com>
To: "John F Sandhoff" <sandhoff@csus.edu>
Cc: <datsun-roadsters@autox.team.net>
Sent: Thursday, February 14, 2002 4:18 PM
Subject: Re: Basic question about compression ratio
> John and everyone else who replied, thank you! That clears up what
> determines compression ratio. A follow-up question specific to
> Roadsters - in the R20 "stroker" motor, what pistons are being used -
> H20 or U20? I assume the domed U20 pistons would produce a higher
> compression ratio than the dished H20 pistons.
>
> Do you have to use H20 crank/rods/pistons or U20 crank/rods/pistons or
> can you do some mixing and matching? (H20 crank, U20 rods/pistons,
> etc.)
>
>
> --- John F Sandhoff <sandhoff@csus.edu> wrote:
>
> > Also note that the R pistons, with their domes, intrude into the
> > chamber area, effectively making it smaller (and thus raising CR), By
> > the
> > same token, the dished H20 pistons make for an effectively larger
> > chamber and thus lower CR.
>
>
>
> =====
> Adam
> '70 1600 SPL311-28181
> http://www.picturetrail.com/abend
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>
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