Charon wrote on 12/18/12 at 17:13:11:I've never been that involved in engine modifications, but I understand that a crank throw can have metal added to it on the outside by some variation of welding, and then the throw can be turned or ground with its center slightly further out, thus increasing the crank throw and the stroke.
That is an offset grind of the same size. You can also go with an offset grind at a smaller size if you are willing to change the rods. (Which you may have to do anyway.)
I was looking at doing this on a Marauder. Now I have not been deep inside a Savage motor, so this may not apply, but the same guys designed both so...
With more throw, you have the rod going down into the case more. There was insufficient clearance in the Marauder case to do this without clearanceing the case. And the case walls are kind thin, so that made me nervous.
Also, with more throw, you have sharper rod angles. I was looking at potentially having clearance problems with the side of the rod and the bottom of the jug.
And if you solve all that, you had best calculate the deck height right. Shorter desk heights mean more cam chain to take up... And it also retards the cam as it takes it up...
I decided to look at other places than displacement. Specifically raising compression, cam advance and timing advance.