There not a low end torque engine [&o] now a 4 cycle (not airplane) would do you the most good for low end torque but its impossible if your doing this in a 1/8 or 1/7 or even a 1/6..............you might as well go onto the 1/5 and get it over with but you have to be careful there also. 1/5 is a lot easier to fabricate parts for