I would not be suprised if the second engine in this pack is somthing like a 321p with out the shinny bits. It may not look flash but i would be suprised if it dose not paform at least as good as the 221p or 721p or 321p. I think its based on a plus desine in that it may have a 14.5mm crank. But i am only gessing. I'm shore people will post about paformance soon now they are hitting shops around the world. Regards Jeremy.