Important to stay apples to apples. The 1835 will make 60 reliable continuous HP at 3400 to 3600 rpm. The 1600 will make 50 HP. Now, burning the fuel to make the 10 additional HP in the 1835 will require more heat to be shed. - If you have good baffling, both engines can do fine at these HP levels. -. If you restrict your throttle hand to 50 HP, both engines require the same baffling (and the 1835 will make it at lower RPM) - if you want 60 HP from the 1835, then the baffling will need to be good. Not "great":. There are fast little planes that can use 2180cc engines to make 75 HP, they have the same fin area as the 1835, and the don't exceed 375f CHT in cruise. So, keeping an 1835 within limits is not a big challenge. The 10 extra HP in a plane like a V-Witt, iMO, would provide not just more performance but more safety.