Identify this PISTON

Absolutely NOT stock or OEM !!    Power Crater bowl only is stock gas or LPG.

Looks like a M&W piston to me.

It has Comfortmatic on the side. Google it.  

Ooops, Thanks for the spell check.    

Well if you do Google it you get one post in here from 2010 when someone asked about them and no one replied and there are a couple of posts from yesterday's tractors where it looks like of you get the number off the piston skirt someone Ober there might be able to set you up with rings.

Yep thats it !!!!!  And that's also why i ask question on here ......  You get the real answers with pictures.  :-))))

I can get u new pistons like this for the 149 engine .

Hey Fred
Do these piston increase compression ???
Thanks in advance.

Since the design has a bump out on the top, it's POSSIBLE that the piston height/displacement could yield a different compression ratio, but more than likely, the engineers didn't go to any extreme measures to increase the CR.

The side effect to redesigning piston heads for higher CR, is increased shrouding of the valves, and disturbing the airflow. The internal-combustion secret society realizes that former isn't a really big deal... the piston shrouding valves only occurs when the slug is near TDC, and as the piston continues south, the shrouding moves away, but the complex shape of the top tends to create little pockets of stagnation, so the possible improvements and detractions are likely to cancel out, yielding more of an academic result than actual.

So unless there's really well-documented before-after performance change, I'd bet my buck that it was more patent-protected marketing magic than applied science.

That being said, one WILL find 'conforming pistons' to be more prevalent in air compressors than internal combustion engines... In larger scale scenarios, I saw the lid off a LeRoi (RoiLine) engine set up to be an engine-compressor 'unit', where the compressor slugs were conformal-fit to improve compressor output.

Edited by Dick L - 31 Dec 2015 at 1:21pm