Reply to thread

Message

[QUOTE="Brianc, post: 559692, member: 26159"]
The short answer is the longer stroke engine ( under square ) will produce more torque and a more broad power range ( less peak hit ).  The oversquare engine allows the use of larger valves which could improve the volumetric efficiency. But you probably don't have the facility or resources to change your valve(s) to take advantage of the bigger bore. If you are road racing ( superbikes; etc. ) you will want the higher revs from the oversquare design. For us mere mortals in the dirt, you will probably reap more benefit from the long stroke - under square design. An engine with a stroke of 64 mm will safely spin 13,000 r.p.m. Another important factor is all other parts being equal, your long stroke version will have a higher compression ration which will produce more torque and horsepower. If you increase the stroke from 54 to 64.5 your compress will increase almost 20% ( using the same piston, etc. ). I think most people go to the big bore piston kits because it is a lot less work and a lot cheaper. But you get more fun usable power from stroking your crank.
[/QUOTE]

Verification

Which ocean is California closest to?