what's the .18 engine external size? are they same as .12 and .15? or more like .21?
I was just wondering if I can fit a .18 engine into a car with .12 or .15?
Are they pretty much the same size? I am asking this because I am curious about the OS18TZ.
also, what about .20? like...Traxxas TRX3.3?
can TRX3.3 fit into a car with .15 engine? since the TRX was designed to replace cars with TRX2.5?
also, what about other sizes? like, .28, .32 or .46? are they pretty much the same size as .21?
Thanks for any help