RE: what engine can I use
I'm guessing it is from a car.....yes, that it a car motor. I am seeing electric...yes it's an electric motor use in R/C cars....but wait, I'm also seeing it is popular for model trains....maybe that is why it's so slow.
I don't know much about those car motors, but I believe it would be interchangeable with about a million other motors available.
Have I been any help?