the firehammer has a 23cc engine that goes into the 7000rpm range most likely, that diesel is 10 times the displacement and nearly 20 times the weight, to run that you need something the size of a small gokart as using something the size of a firehammer it would be top heavy...

not trying to discourage you, I'm all for it, it's just going to take more than bolting to the firehammer or any other 1/4-1/5 scale cars, and the gearing is going to be important while working with half the rpm range of a 2 stroke engine (1/10th of what is on 1/10th scale cars)