That's what I thought! So its actually a "24" (4.0cc) rather than a "28" (4.6cc). Sounds like someone is telling a few fibs? I'll have to buy something else now.

Any suggestions on the most powerful RC car engine up to 5cc? Horsepower is what I'm after - nothing else matters. I'm planning to use it, after suitable mods, in a control line speed aircraft.