Quad ringed piston ?

[Stihlsmoking]

Long story short bought a 026 online cheap looks good but locked up ?

First thing I noticed is AM cylinder.

Crank broke punched hole in case half.

Pieces of piston from crank.

But a quad ringed piston ?? Anyone ever seen this ? Thanks

 

[J_M____]

Is it really 4 rings or does each ring just have a groove in the center?

 

[lwhaples]

NWP have pistons that look like yours.

 

[Stihlsmoking]

Is it really 4 rings or does each ring just have a groove in the center?

It is one ring with a groove ? I didn't take one off to check but thought they moved separately.
I've not seen a lot of AM stuff ?

 

[jacob j.]

It is one ring with a groove ? I didn't take one off to check but thought they moved separately.
I've not seen a lot of AM stuff ?

They're each one ring with a groove.

 

[Stihlsmoking]

What's the point of the groove ?

 

[jacob j.]

To hold more oil apparently. I had nothing but trouble with those rings when they first came out and now I won't use them at all.

 

[Stihlsmoking]

To hold more oil apparently. I had nothing but trouble with those rings when they first came out and now I won't use them at all.

I'm going oem everything ? Looks like I get to use one of my parts saws.

 

[Chainsaw Jim]

I have heard of people putting two thin rings together in one thicker ring slot. I'd be interested to know if any members around here have any feedback to share about that.

 

[Terry Syd]

I have heard of people putting two thin rings together in one thicker ring slot.

Sounds like a 'bush engineering' way to save a worn piston groove.

Seems counter productive for performance and long life. The whole purpose of going to thinner rings is to help prevent 'ring float'. Doubling up the mass in the groove would allow the ring/s to float sooner in the RPM range.

There's also the issue of pinning the second ring so it doesn't move. And there is another possible issue of excessive ring wear between the rings as the rings may wear well against an aluminum surface, but could have increased wear when two steel surfaces are rubbing against each other.

 

[Chainsaw Jim]

Sounds like a 'bush engineering' way to save a worn piston groove.

Seems counter productive for performance and long life. The whole purpose of going to thinner rings is to help prevent 'ring float'. Doubling up the mass in the groove would allow the ring/s to float sooner in the RPM range.

There's also the issue of pinning the second ring so it doesn't move. And there is another possible issue of excessive ring wear between the rings as the rings may wear well against an aluminum surface, but could have increased wear when two steel surfaces are rubbing against each other.

Are you sure you didn't leave anything out?