What is this piston from????

[Lead Shoes]

This came up on a local forum I'm part of... any ideas of what this could have came from? the valve relief and back section are extremely interesting in design and have me curious...

 

[The_Jed]

Air compressor?

 

[Propflux01]

looks like a 2-stroke piston. Boat maybe?

 

[spasm3]

With the sharp edges, i don't think its a combustion piston, I vote air compressor.

 

[Lead Shoes]

Nobody knows what it is exactly, we've just been guessing also...

 

[punisher]

2 thin rings. No oil ring. Possible 2 stroke. Odd shape for a compressor piston. Tiny piston pin, no retainer grooves, could mean low speed operation........ compressor.

EDIT: Maybe

 

[Zaedock]

Looks like a marine application.

 

[Lead Shoes]

I'm just hoping that someone can identify where its from to satisfy my curiosity...

 

[bvance554]

I've torn a part a few old Evinrude/Johnson outboards and they have pistons exactly like that.

 

[SnPb]

I suspect that it is from a Johnson/Evinrude outboard motor. Search the internet for "Evinrude piston" and you will find some that look like it.

bvance554 beat me to it.

http://i711.photobucket.com/albums/ww113/dougweason/Pistons.jpg

 

[Lead Shoes]

Hmmmm.... That may be it, it looks rather similar...

 

[Olive1465]

I wonder why it was designed like that?

 

[Trav]

Originally Posted By: Olive1465
I wonder why it was designed like that?


Look at CROSS SCAVENGED 2 stroke.

http://www.maxrules.com/fixtheory2.html

 

[Olive1465]

Originally Posted By: Trav
Originally Posted By: Olive1465
I wonder why it was designed like that?


Look at CROSS SCAVENGED 2 stroke.

http://www.maxrules.com/fixtheory2.html


Thanks!!

 

[spasm3]

I think he is right , very similar piston for sale on ebay. Evinrude omc piston.

http://www.ebay.com/itm/PISTON-385338-03...248&vxp=mtr

 

[spasm3]

I would have thought that the sharp edges would cause preignition and detonation in a gasoline engine. On high compression engines, you usually smooth out the valve relief ridges to prevent hot spot detonation. Is that not a problem in two cycle?

 

[stroked93]

The plug fires off the sharp edges. The plugs don't have a ground like a traditional gas engine