I am in the process of shopping for a new lawnmower. Now I know about all the options out there and am used to comparing engines based on horsepower but, got a bit of a surprise by the latest labeling on engines. They are advertised by foot pounds of torque and CC's. How do these two ratings interpret into horsepower. I realize the larger the number for both ft. lbs. & cc's, the bigger the engine but, don't know what the ft. lbs. & cc's are for a 4hp, 5hp, etc... engine. Can anyone translate ft. lbs. &/or cc's into hp?