What is the technical difference between a SP500 HO engine and a common engine?

 

Basically a higher lift cam and higher compression piston. I think they might have put in larger intake valves, but don't hold me to it.

 

Higher lift cam, bigger carb = 20% MORE POWER

 

Sorry for my poor english. Can anyone describe whats a "higher lift cam" ? Dont get it. In case I buy a 6X6, is there a way to mod the engine up to a HO engine?

Martin

 

The camshaft opens the valves.
A "higher lift cam" has bigger cam lobes which opens the valves more, and more air/fuel is sucked in.

Camshaft "Duration" is the length of time the valve is held open.

Usually higher lift also means more duration to go with it.
(valves open MORE, and stay open longer)

hope I helped. -Matt

 

I would like to add another thing.
When Polaris upped the horsepower, they also strengthened the crankshaft, and the point where the crankshaft bearings attatch to the side cases. Making a non-HO into a HO risks overloading the crank, or side cases if you pull it hard a lot.

Farmr

 

Basically the HO makes 20% more power than the non HO in the higher rpm ranges. From what I have read, to do this it actually sacrifices some low rpm torque. I agree with Greg Sims in the other post - for this type of work the non HO engine is probably superior. In any case, it is not at a disadvantage.

The problem here appears to be traction due to lack of machine weight. The Sportsman 6X6 or Ranger would appear to be better choices.