oval bores?

[roclist@accessconsulting.ca (Jason Adams)]

Nah there oval, I'll scan the passage from my "3 series enthusiasts
companion" book...

Stand by...

jason

----- Original Message -----
From: "Larry" <rocco16v@netzero.com>
To: <jdbubb@ix.netcom.com>; "Jason Adams" <roclist@accessconsulting.ca>
Cc: <joshhignight@techography.net>; "Scirocco List"
<scirocco-l@scirocco.org>
Sent: Thursday, July 04, 2002 9:08 AM
Subject: Re: oval bores?


> No bore is perfectly round (depends on how many decimal places you want to
> go with the measurements).  All engine builders strive for perfection,
> however.
> The BMW/elliptical bore statement may be a distortion of the fact that
> PISTONS are not machined perfectly round, but made slightly oval, to
> compensate for varying expansion (from heat) of different piston mass. ie
> the piston supposedly expands more in the piston-pin direction (because of
> greater mass of pin bosses) than in the direction 90degrees to the pin
> (thinner, skirt area)
>
> Larry
>
> >
> > Jason Adams wrote:
> >
> > >I know bmw have slightly elliptical bores
> >
> > I'm thinking this statement is going to require some proof.
> >
> > As far as Josh's engine there is no way the local machine shop can
> > machine or hone anything but a round bore.
> >
> > Sorry about my attitude in advance.
> >
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> >
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