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Modding 1275 A+ or 1100S

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Kennomini

Post subject: Modding 1275 A+ or 1100S

Posted: Tue Aug 21, 2012 6:08 pm

1275cc

Joined: Thu May 24, 2007 7:19 pm
Posts: 5370
Location: Yandina,Sunshine Coast,QLD

What are the main differences between a 1275 A+ engine and a 1100S engine? I'm planing on boring it to .94thou (1360cc) and wedging the crank then putting the BMW twinky head on it.
From memory the 1100S has larger journal crank better suited to stroking but unmodded are more likely to break at high RPM...is that correct?
Also the rods are heavier so it would be better to get them lightning?
Are their any other differences that will effect a high performance road engine :?:

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qa50

Post subject:

Posted: Tue Aug 21, 2012 6:10 pm

848cc

Joined: Tue Aug 08, 2006 9:43 pm
Posts: 141
Location: Gippsland Victoria

I asked a similar question a few months back:

http://www.ausmini.com/forums/viewtopic ... highlight=

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