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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bore And Stroke Being Squared
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[QUOTE="jmics19067, post: 556778, member: 27963"] everything is a compromise. Although the shorter stroke doesn't have to throw the piston as far from the center line you are throwing a bigger piston. And even though you have more mechanical leverage with the longer stroke you dont have as much btus of energy being produced on top of the smaller piston. It appears that in the 70's they used large bore short stroke engines that went square in the 80''s to 90's and now are favoring a longer stroke smaller bore . The 1970's YZ400 actually have less stroke than a new YZ 250. yet I am sure the 250 will rev higher. Apples and Oranges but I know but you can kinda cathc my exaggerated feeling. I am not sure how one would design something from scratch but if modifying an existing engine you definately have to find the limitations of existing design before you try and add. Besides the obvious of boring it out to the water jackets or stroking it so the crank saws the cases in half you have to look at what would complement or at the very least not hinder the stock location of what was left. Probably a four year degree and definately lots of math to try and get even close to giving you a decent answer on this. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bore And Stroke Being Squared
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