I was just cruising the XS Engineering eGay store and I found some EVO 3 pistons they are selling dirt cheap. They have hard anodized lands like we were discussing:  EVO 3 PISTONS.

The 3 pistons break ring lands pretty easily. I wonder if it is the anodizing or just the higher compression. I am not sure if the other model Evo pistons come anodized.

I think its the tuning. Look at the thickness of that top ring land.

The 3 pistons are super buff in my experience. I have never broken a stock piston, but then again I've only tuned 3 EVO 3s in my life. One of them is a 450whp pump gas (Japanese pump gas) street driven/occasional track car and it still runs today (I tuned it in 2001).

Certainly detonation is the cause, but it is almost a given that an Evo 3 with stock pistons will have broken ring lands from my experience. The Evo 1 pistons and Evo V and up seem to put up with the abuse better.

I was just loking at the picture and it looks like the pistons say 63DTH1. All the Evo 3 pistons I have seen say 63DTE3.

Perhaps my huge sample size of 3 EVO 3s isn't very indicative of the real world examples.

What are DTH1s pistons then?

I  dunno. I've never seen those before. Iam going to see what I can find.

Edit: Apparently those are Evo 1 pistons. I could have sworn my Evo 1 pistons said E1 on them. Makes me wonder if I was right about the E3 on the 3 pistons. I have a broken set at my shop I can take a look at tomorrow.

Posted By Horsewidower on 03-24-2010 10:12 AM
Are you using Techline products?

Yes I am.  I'm one of the few that is licensed by Techline to apply some of their specialty coatings.  From my research and first hand experience, I can safely say that Techline coatings are he supeiror choice in coatings for everything in and outside the engine.

 

 

 

 

 

Nicely done. Did you measure the difference in diameter before and after?

they were only a couple tenths under due to media blasting the substrate to promote adhesion for the coating. Once cured, it bonds itself and becomes the piston from that moment on. I coat everything from bearings/connecting rods/intake manifolds/combustion chambers/exhaust ports/valves/wrist pins/lifters..you name it I can coat it. I have all coatings in stock and ready for use. I can post images of a few items I've coated if you want to see the workmanship

Thanks, but I was just looking for a before and after measurement. Does the coating "wear in." Is it reasonable to assume that only a couple of mils remain after break-in? I'm just trying to figure out if this is a viable way to adjust a piston diameter.

this particular coating doesn't do that but Techline does offer a coating that you can use to build up the piston skirt if that is what you are aiming to do. PM/Email me for details if you are interested.