Aluminum or Steel?????

[powderman800]

I'm looking in to top end kits and I've found two kits; steel (I think) from wiseco and aluminum from someone (vertex???). Which one is better? It is $300 for steel and $100 for aluminum. They both come with same stuff (rings, gaskets, clips). Help would be appreciated. Going in my backup 99 RMK 600.

 

[Clarke673]

ummmm not sure on that but i have found that when putting new pistons and sleeves in, just go with the stock polaris. Wiseco is ok for trucks and stuff but i have seen a lot of seized wisecos because they aren't to spec.

Im sure some one who actually rebiulds engines or knows more will chim in but as far as i would go, stock polaris is by far the best, even if it costs a bit more.

 

[powderman800]

Anymore

Anybody else have and opinion???. I'll look into the OEM kit. I_OWN_U thanks for the input.

 

[Dam Dave]

choices are Cast or Forged and there both aluminum

 

[grayghost]

Forged are the only way to go IMO, because they are much stronger than a cast piston. The downfall to the forged is that they have to be taken care of, meaning you have to let the engine warm up completly before taking off with the sled and honking on it. What happen is the forged piston will grow faster than the cyl. will so if not warmed up properly with water temp, you will see alot of cold siezures. This is why wiesco often gets a bad rap. So if you are a person who can wait and warm up your sled properly you will be better off with the forged, if you are a pull and go guy than cast will be much more forgiving as they will not pull the heat in as fast as the forged. Just my 2cents.

 

[diggerdown]

I don't know about forged being stronger than cast but it is true that with a forged piston you need to let the engine warm up more and you also should have a little more piston clearance. I do beleive all the manufactures use cast pistons, because they do have to warrenty the engine and have no control on how it is treated. The forged pistons are lighter, so it is makes for a little faster spool-up of the R's. Be sure to check ring gap and if you use forged pistons, make sure your cylinders give enough clearance for piston expansion.

 

[powderman800]

Wiseco it is

Thanks guys for all the input. I guess I'll be ordering a Wiseco kit. I'll be sure to let her warm up.