i really dont think that it puts out 2.2 hp, most big block 28's have that kind of power.

Here are the specs for an os cvrx .18, very powerful engine, definately more that the hpi engine. I am not bashing your engine, i have seen them and they run good but hpi's horsepower is way over rated. i run the os cvrx in a few of my rc's and i love them, they have alot of power.

SPECIFICATIONS
OSMG2102
Displacement: 0.18 cu in (3.0 cc)
Bore: 0.629 in (16.0 mm)
Stroke: 0.590 in (15.0 mm)
Practical rpm: 3,000-32,000
Output: 1.35 hp @ 28,000 rpm
Weight: 10.4 oz (296 g)
Includes: 203 air cleaner
Requires: glow plug, manifold and muffler or tuned pipe.
11881 18CV-RX ABC Parts listing