The principle behind camshafts is simple: if you can open a valve further for longer, you can get more air/fuel mixture into your engine. If you can burn all of this and exhaust the waste gasses (through your exhaust valve being open further, for longer), you get more torque, which with revs, means power! Alas, reality dictates that bolting an outrageous camshaft into a standard engine will simply result in very poor running, so we’ve categorised our camshafts as below. Anything beyond RBC4 and RBC12 is not recommended for use with a completely standard engine. It should also be noted that uprated camshafts are not compatible with the standard injection system, requiring use of either carburetors or a mappable system.