swap update / issues / weights

[Dan Bubb" <jdbubb@ix.netcom.com (Dan Bubb)]

Bore centers are 88mm. i.e.from the center of one bore to the center of the
next is 88mm.
That's only 5.5 mm wall between bore with an 82.5mm bore. And the general
consensus is most of these blocks can be bored to 84mm. So, 4mm wall or
.16". With that thin of a wall the cylinders most be siamesed. There is no
water jacket between bores.
That doesn't mean the OD of the cylinders on the sides of the bores aren't
larger, but there isn't a lot of need due to the very limited thickness
between bores.
So, there's probably a little additional weight there (or a wash when you
consider loosing weight from boring out the cylinders), plus alittle in the
bulged crankcase sides, alittle in the longer throw crank.
----- Original Message -----
From: Allyn <amalventano@sc.rr.com>
To: Scott F. Williams <sfwilliams@comcast.net>; Michael Abatzis
<abatzis2@hotmail.com>; <scirocco-l@scirocco.org>
Sent: Wednesday, March 12, 2003 1:44 PM
Subject: Re: swap update / issues / weights


> i thought the 9a was engineered to have that bigger bore, so its jackets
> should not only be bored to a larger i.d., their o.d. should be slightly
> larger to accomodate, shouldnt it?
> just a guess, i got nothing to back that up.
> Al
>
> ----- Original Message -----
> From: "Scott F. Williams" <sfwilliams@comcast.net>
> To: "Michael Abatzis" <abatzis2@hotmail.com>; <scirocco-l@scirocco.org>
> Sent: Wednesday, March 12, 2003 10:03 AM
> Subject: RE: swap update / issues / weights
>
>
> > > huh. i would think you'd LOSE weight with a 9a. you're
> > > taking away metal from the cylinders, after all.
> > > -Michael Abatzis
> >
> > Sure, you're taking metal away from the cylinders, but you're also
adding
> > diameter to the pistons. Also, there's more material in the bigger
crank,
> > etc.
> > --
> > Scott F. Williams
> > NJ Scirocco nut
> > '99 Subaru Impreza 2.5 RS
> > Mazda 323 GTX turbo "assaulted" vehicle
> > Golf GTI 16v "rollycar"
> > ClubVAC: "Roads found. Drivers wanted."
> >
> >
> >
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