The Gowesty article on pistons is quite interesting. Just one factor, but
according to them, the 1 or 2 mm difference in piston height is a
relatively big deal.

Not that the likes of Dennis needs to read this article but here 'tis:

http://www.gowesty.com/tech-article-details.php?id=82

Problem is, one may need to adapt the case for this piston. I don't know enough
to speculate why, but I'm sure it has to do with the displacement increase
(slightly wider piston?). Anyhow.....

I too am not a fan of boring out cylinders. As a kid, with air cooled
engines, reading about
displacement increases seemed kinky back then.

Neil.

On 5/2/16, Dennis Haynes <d23haynes57@hotmail.com> wrote:

> Many of the piston/cylinder sets are notorious for bad rings. The 96mm big
> bore sets often have the wrong rings on them, 94mm rings on 96mm cylinders.
> Huge ring gaps until the rings snap.
>
> For all the money often spent on rebuilds I find the water boxer responds
> very well to just replacing the parts broken or worn. Heads, rings, gaskets
> etc. If the case is shot then shot it is. I have repaired many an engine by
> doing just one cylinder/piston. Quality rings is the key and when folks are
> willing going  for the "total seal" gapless 2nd ring makes a huge difference
> in reducing blow by.
>
> When replacing the piston cylinder sets I often throw the rings away and
> replace with something better. When possible I try to get the COFAP sets.
> They have yet to let me down. As for displacement upgrades the thought of
> thinner cylinder walls added to increased compression ratio and to the
> extreme longer stroke crank just adds to reduced engine life and possibly
> NOx emissions issues.
>
> Dennis
>
>
--
Neil n

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