Originally posted by RCFreakInFL
No, it is called a 2.5, because a .15 is a 2.5cc motor. It was actually called the 2.5, to separate itself from the 1st series TRX 15's that were used in the 1st gen MAXX's, 4-tec's, and Nitro Rusty's....a 2.5 to me doesn't sound bigger than a .15, it sounds the same....because it is 
You have to admit, to an uneducated consumer, a 2.5 does sound like a larger engine than a .15. Does Traxxas actually market it because it sounds bigger? Only Traxxas can answer that. My personal opinion, yes, but that’s just my opinion.
And, i8tweety, there is an reaction that occurs, I am sure the metal in the coil holds some heat, but is a reaction too.
Sean