I will be testing a Caster Storm ,they say it has a 2 speed gear box and has a top speed of 45mph. I will be testing a .21 abc black box engine.. they are shipped to me with only a serial number on them ...no other markings.I suspect it to be the new h.p. champion that has 1.82 hp and fuel consumption is probably gonna be an issue because I have a log sheet for cc's of fuel vs. runtime vs. restrictor size. It will be interesting ...I like to borrow cars to practice with. I race with my Fleetwood.