reboring cylinder on 700ccm

[deda]

Hello folks
I have one question..is it possible to reboring cylindar on 700ccm (on 650ccm fiat) an i will put piston from "bis" or do you have another option for piston...and if i doing that is it ok to go down for 1,6mm of head or i put standard head....i mean is it going to be "too much" compression:) THANK YOU VERY MUCH:)

[ape20ff]

Hello.
I have no experience and I'mnot expert.
Well,126 bis piston are 80mm while 650 77mm.
Cylinders can be bored till 80mm but then the will be too slim and you'll risk.
Bis engine is watercooled and piston aren't made the same way. To fit watercooled piston on an aircooled one people give more tolerance beetwen then and the cylinders.
Anyway many people use this parts for tuning,you have to know how.
I can show a guide in polish.
Here they use watercooled cylinders into the aircooled one:
http://www.126fan.pl/www/zwiek_poj.htm
http://translate.google.it/translate?u=http%3A%2F%2Fwww.126fan.pl%2Fwww%2Fzwiek_poj.htm&sl=pl&tl=sr&hl=&ie=UTF-8
http://translate.google.it/translate?u=http%3A%2F%2Fwww.126fan.pl%2Fwww%2Fzwiek_poj.htm&sl=pl&tl=en&hl=&ie=UTF-8
There are many tips on the site.
A 1,6mm shaved head isn't too much but if you're going to use standard camshaft just use a little less.
If you look at all guides you'll see a 2,5mm shaved head with standard camshaft but turned of some degrees.
Here the polish site:
http://www.126fan.pl/
See you.

[Pony007fromPL]

Cylinders will be too slim - checked in Poland