Piston Identification Help ?

[George Rohrbach]

  I have been doing inventory on some of my parts. Last week was pistons, mostly Commander Big Six. Of course the easy ones were the Studebaker brand. However I do have some after market also. The way I identified  those was by measurement - fairly easy. 3.250 and up are 1934 to 1937. 3.3125 and up are 1948-1960, Iron ones are 1942.

  However, I have a set of 4 Aluminum ones, that mic out to 3.140.

Which does not match. I thought the might be Champ, but they are 3 inch, and a .140  over does not seem logical. From what I can find, Rockne STD pistons start out at 3.125. If it was .015 over, that could be a match.

  Or come up with another idea? I have spent hours checking on the net, and could not find anything.

  The pistons are marked Silv-0-lite S-115. Just in case anyone has a old Silv-0-Lite catalog.

Thanks

[Gary_Ash]

George:

Try contacting the current manufacturer of Silv-o-lite pistons at http://www.uempistons.com.

 

[Spinneyhill]

Any chance you can find the piston pin diameter and the compression height on a Rockne piston?

[George Rohrbach]

Gary, I have sent them email, thanks for the link.

Graham - thanks, if I can't find out from the manufacturer, I'll give it a try.

George

[rbk]

On 2/25/2018 at 7:54 PM, Gary_Ash said:

George:

Try contacting the current manufacturer of Silv-o-lite pistons at http://www.uempistons.com.

 

George

Did you get a reply from them?

Gary , thanks for the link to this fantastic website.

Everyone should see this.

I wonder how helpful they are with early engine parts.

[mribbich@wi.rr.com]

The pistons may be Semi pistons which means they need to be cut down to size. Was a common practice back then, you need a special machine for sizing them is my understanding.

 

Marv.   

[starlightcoupe]

George indicates his computer prevents him from a current response but the pistons turn out to be 1929 Commander 8 Model FD, with 250.4 cid.