Would like to know what the performance of the Kohler ch1000 is on a mudmotor

Had a short production run and mod kits were never introduced.

Why aluminum block engines (except v-twins) don't work well for pulling competition - Top of page

An aluminum engine block will "bend and twist" or flex a few thousands of an inch when hot and under pulling stress. Therefore, they'll lose valuable compression because the valves become unseated and the piston rings lose partial contact against the cylinder wall. Not to mention the main bearings are also put into a bind under the stress of pulling.

Cast iron engine blocks on the other hand hold their shape a lot better when hot and under stress. Aluminum engines work best for conditions that doesn't place them in a lot of stress. Such as ATVs, racing go-karts, racing lawn mowers, etc. Because there's fresh air moving over the engine, keeping the metal cool, and the block isn't being strained by the vehicle pulling a heavy load. This is why the cast iron block Kohler engines work best for competitive pulling. We think that Kohler is the best engine for pulling. They're the "Chevrolet" of garden tractor pulling engines. Because cast iron is able to "hold its shape," handle high operating temperatures, severe stress, high compression and high rpm. This is why most riding mowers, lawn tractors and lawn & garden tractors have aluminum block engines. And most garden tractors have a cast iron engine block.

In addition, on the cast iron block single cylinder Briggs & Stratton and Tecumseh engines, the valve stems are parallel to the cylinder. This means that the valve heads set further away from the piston. And in the cast iron block single cylinder Kohler engines, the valve heads set closer to the piston (valve stems are angled). Therefore, Kohler are capable of producing more compression, and they can flow the air better in and out of the combustion chamber at high rpm.



Thought this was interesting!! Took it from a lawn tractor pulling website.