Alky could replace nitro, but you can still blow them up as well. Have seen alky fires almost as bad as nitro. Was reading the above posts. I was at OCIR in the early 70's, sitting in the top end bleachers, and 2 back motor T/F cars came thru the lights. One blew the blower, BIG flames coming out of the back, and I felt the heat where I was sitting in top row. Would hate to experience that today.