paulmarshall wrote on 04/19/13 at 13:49:44:[A different conrod does not make up the cc to 650 as it still goes up and down by the same amount. So I am thinking that the barrel and piston width must make up the other 250cc. ]
If one rod is shorter than the other then one will travel less and move down or up before the other.
Paul. Let me explain!. A crank gose up and down or in a circle if you want to be right about it. The distance that the crank goes up and down is the measurement away from the middle of a turning crank. If it comes up 3inch above centre or up the bore then as turns it goes down the bore a total of 6 inch from the top, TDC. So to get a piston connected to the crank it uses a conrod. That conrod length is calculated with the piston. If its a shallow piston it will be slightly longer than a normal piston. But the piston has to reach the top of the bore to compress the air and fuel. So no matter how long the conrod is, and the combination of conrod and piston. The piston only travels 6 inch like the crank. From the bottom of the stroke to the top. So that is the displacement cc. If we want bigger displacement we have to make the crank go in a bigger circle or movement up and down. To do this we can make it go 4 inch at its highest and 4 inch at its lowest, this makes 8 inch in total. So total displacement would be 8 inch which is bigger. The piston would be shallow this time or it would hit the head.
Anyway I have contacted a friend of mine in Japan. He is English and I have asked him if he can get me some information on the LS400. I am waiting for the reply. If anyone wants to know anything about the 400 let me know and I will ask him.
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