A friend and I were having a conversation about nitro engines last night, and an interesting question came up regarding .21 engines vs .26, .27, .28 engines.

Now - The general concensus is that the larger engines will produce more torque. This doesn't make sense to me. To generate more torque, you need to increase the stroke of the engine. If one wants to increase hp and rpm, then you increase the bore of the engine. Now, the .26 ect engines are the same as a .21, just bored out to .26 or larger. Technically, since the stroke is the same, and the engine is now over-bored (bore is greater than stroke), the engine should become more higher revving, have more hp, but less torque. This is the theory, but I have had many people tell me that the .26 engines have more torque than the .21's

What does everyone else think?