Anyone knows what brand of pistons are these?

[RedTsi_PR]

Hey guys im in the middle of changing my headgasket and putting arp headstuds to my 1gb daily driver.Once i take out the head found that the engine had this pistons installed but they dont have any marking on them and looked aftermarket.Here's a pic:

You must be logged in to view this image or video.

 

[92AWDHX40]

They look like oem ones i just had mine out so they look like standard oem pistons.

 

[RedTsi_PR]

Oem ones says 63D

 

[92AWDHX40]

Well bud they could be anything looking from the top of them. http://www.dsmtuners.com/forums/cylinder-head-short-block/425028-what-pistons-these-urgent.html


Got mine they are npr or oem equivalent.

 

[RedTsi_PR]

Even the dish looked different from a replacement or an oem one

 

[JacksonAuto]

Looks to be a cast replacement piston. Not OEM, but could be from an aftermarket company like TopLine, NPR, ITM, etc. I'd be more concerned that they're standard bore.

 

[Ghost_92TSi]

They look like higher compression too. I'm impressed that they are that clean, mine always have some build up.

 

[RedTsi_PR]

Thats what im thinking,They look different from every replacement ive seen.Guess i'll have to get the crank out to find out

 

[donniekak]

The material looks to shiny to be cast. I think they look like a forged aftermarket piston.

 

[JacksonAuto]

Look at the texture and color inside the valve reliefs. They're cast with machined tops. Not out of the ordinary.

 

[JacksonAuto]

Here's an example. It's a cast piston with a machined top and skirt.

You must be logged in to view this image or video.

 

[RedTsi_PR]

Thats true but they aren't ITM,NPR or OEM so my question is what brand made "Replacement" of that kind

 

[92AWDHX40]

Hard to tell, without seeing more than the top of the piston. ive been looking havent found any information just by looking at the top and seeing std. Guessing aftermarket now i look at it again, but it could be anyones guess. I would just run them and go with the flow unless you want to pull them out, no need to, are you in a time constraint to identify them?

 

[JacksonAuto]

Take them out and look at the underside. My post was in response to donniekak who asserted that it was a forged piston.

 

[RedTsi_PR]

No im just changing the headgasket and putting arp headstuds on it.Block looks firm and pistons too.Before the head gasket blow i did take the conpression and it did 160 all across.So block must be in good health

 

[JacksonAuto]

So block must be in good health

Compression doesn't tell the whole story. To know for sure you should have done a leakdown test. I'd feel confident using the shortblock for a stock-type rebuild, but for a performance application where you'll be turning up the boost and RPM I would seriously consider taking it apart to see what you've got. Someone rebuilt it at some point and used standard bore pistons. I'd be willing to bet that the cylinders are out of round which will be made even worse with the installation of head studs.

 

[donniekak]

Look at the texture and color inside the valve reliefs. They're cast with machined tops. Not out of the ordinary.

I can't really see the valve pockets on my tablet. I've seen plenty of other pistons with that appearance, but never in a 4g63 application.