Im just wondering if i had a .46 and .40 LA engines and runnig the same prop on both would that generate the same amount of power. And what exactly is the difference between a FX and LA does one give a higher RPM?

Thakns for any replies,

Papa

Papa, the bigger engine will make more power. The .40 should be using about an 10x6 prop and most .46 should be using an 11x6 or 11x7 prop. Both will turn about the same rpm, but the bigger one will spin a larger prop for more power ( your moving more air with the bigger prop).
The difference between the FX and LA engines are the crankshaft bearings. The FX uses ball bearings that spin more freely, where as the LA has a brass alloy sleeve bearing that supports the crankshaft. The sleeve bearing has more drag on the crankshaft, thus less power to the prop. It's not a big difference, but the sleeve engine is a lot cheaper to make and buy than an engine with ball bearings.
Suptter