If you are asking about physical size, I don't know. If you're asking about displacement, yes, a .46 is larger than a .40. These numbers represent the engine's displacement in cubic inches. Note that displacement is only loosely related to power. While in general, engines with a larger displacement will have more power, there are many different levels of engines. It's not hard to find a .46 engine that has more power than a larger .61 engine. However, the .46 will most likely cost more money.