HELP..... Piston Identification

[LethalEagle]

Can anyone identify these custom pistons? The only info I have is that they are .50 over.
I have no idea what compression ratio......

I sent pics to Wiseco... they said no.
I called Ross.... they said no without even seeing pics...
There are no markings or numbers on the pistons.

Not JE's either.... I'm waiting on an answer from Venolia now.
Wouldn't surprise me if the name had been removed by the builder.

I'm still searching....

No one can identify these???

 

[Big Woo]

Are you sure that they are .050 over and not .5mm over?

 

[TheAdvocate]

I dont believe any of the well known companies go over the 30 over.. Are you sure they are for a DSM?

 

[LethalEagle]

I dont believe any of the well known companies go over the 30 over.. Are you sure they are for a DSM?

Sure they do... Most go 20, 40 and 60. The rings actually have 50 stamped on them.
I (assumed) that was 50 over, seeing how my 20 overs were stamped 20.

They were installed in a DSM.. But considering the rest of the build, who knows!

 

[Big Woo]

It will be almost impossible to identify the manufacturer without any markings or numbers.

Off the cuff, I think they look like Ross pistons, mainly from the pin boss area. However I can not claim to have seen all of the available 4G63 pistons. However the ones that I have worked with are, JE, Ross, Weisco, Mahle, CP, and Cosworth.

With all this said Ross pistons do have a lot code etched into each piston, so you may want to look closely for some markings.

 

[LethalEagle]

Each of the popular manufacturers said their code and or name would be imprinted..... There are absolutely no markings on these pistons, unless they were removed and then recoated. I even looked for scratch marks where the name or number could have been removed. Nothing........
I know several of the piston designs look alike, but I thought maybe someone could have identified them by their design; without a name.

I guess they will just become paperweights, or more likely put in a less important build.

 

[sbengineering]

They appear to be compression ratio of 9:1 or 9:5, i am still unsure of the make though. And by where the valve reliefs are, they def. look .050over.

I will look into it.

 

[LethalEagle]

That compression would cause even more issues... because the motor was supposed to be 11.1:1

The following is a quote made by the builder on another website.....

"Here is a few pics of some work that we have been doing at the shop lately.
It is a soild fild 4G64 "Shep" style head, 11.1:1 comp., GT4276RL, two Tial 38mm waste gates, 4" downpipe,
stainless manifold, Sheet metal intake, 90mm TB, Tial BOV, 8 160lbs injectors, and so on."

 

[Defiant]

Holy crap, are those things diesel pistons? Are the crowns plasma coated? Where did you find them?

 

[LethalEagle]

Diesel?????

 

[LethalEagle]

Still cannot id these pistons...... I thought surely, on DSMTUNERS, someone would have seen or used a piston like these with no markings. Maybe from a kit, and they are just not marked individually???

Defiant.. You must know Polk.

 

[Defiant]

Tsk. No bumping. Now, it'll be a mystery forever.