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Message: <blockquote data-quote="iswara204" data-source="post: 2701975" data-attributes="member: 22646">Thanks bro..Well, this is wat im planning to do. Compression ratio4g91 = 9.5:1 4g92SOHC= 10.0:14g92DOHC= 11.0:14g93DOHC= 10.5:1So im planning to drop in the 4g92SOHC (10.0:1) and add a thinner metal casket to make the compression ratio close to 10.5:1...this is wat i understand..is this the correct way?? 4g91's stroke length is 77.5mm same as mivec's..the bore is 78.4mm. 4g92and93's bore is 81mm.Understanding the bore and stroke, i understand A piston engine is oversquare or shortstroke if its cylinders have a greater bore (width, diameter) than stroke (length of piston travel). This is generally considered to be a positive trait, since a longer stroke means greater friction and a weaker crankshaft. An oversquare engine is generally more reliable, wears less, and can be run at a higher speed; though with the aid of modern technology, the disadvantages of undersquare or longstroke engines have been overcome. In oversquare engines power does not suffer, but low-speed torque does to some degree <a href="http://en.wikipedia.org/wiki/Stroke_ratio" target="_blank">Stroke ratio - Wikipedia, the free encyclopedia</a></blockquote>

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