which ones would you go with for high comp/low comp?
whats the big difference?

 

First off, endyn doesn't make pistons. They use Weisco pistons and modify them a bit.

So if your questions is Weisco vs. JE, either one is very high quality.

 

i would go with the endyns thats what i have. all they do is sand down the edges for you and make a (roler wave) its suppose to move air in a wave wich promotes better flow of air in the combustion chamber.

 

You know, I like their pistons, but they way Larry tells everyone about them is such bullshit.

They sand the edges, because sharp edges promote detonation. Smooth ones do not.

So if you have a really high C/R piston, and smooth out the sharp edges, you get the best of both worlds.

 

What grit would one use to sand the edges on a set of JE's

 

400 or 600 grit, old V8 info.

 

You could sand down all aftermarket pistons. B18C-EJ1 is right. you sand down the sharp edges so you won't make heat spots and detonat.
About the roller wave thing you guys were talking about... i don't think it has to do anything about how to sand down the pistons, but correct me if i'm wrong. From what i hear is how Wesco designed their pistons. Wesco makes great pistons. They have been tested on streets and strip. They work well.

 

I've used wiseco pistons for years back in my dirtbike/atv days. The quality has always been top notch,

 

I agree, Weisco makes AWESOME pistons. I wish I knew back then what I know now. If I did, I would have used the Weisco pistons in leu of the JE's that I got.

I may be wrong, but I believe TOO (larry) coined the phrase "roller wave" when he started using old V8 technology on his "sanded" pistons.

Again, I could be wrong about that.

 

Does sanding the edges down take allot of skill? I am thinking of doing the sanding but dont want to **** it up

 

me too. anyone know the proper procedure/technique?

 

The "roller wave" theory isn't related to the sanding. It's the shape of the reflector on the exhaust side.