Would you run it?

[Fruecrue]

Cross piston for the 066 build-off.

 

[Warped5]

Me?

Nope.

 

[Adirondackstihl]

Not me.....

 

[Chainsaw Jim]

Since it's for the build off I say hell yes!!!

 

[Fruecrue]

The way I see it, the piston takes the most stress between the pressure applied to the crown and the bosses that apply that force to the wrist pin.
The flaw is on an arm supporting the piston skirt to reduce flex and rocking.
Am I wrong?

 

[smokey7]

How deep is the pores? If its shallow i may run it. But if you can get another i would. Especially if that top end will stay on that saw.

 

[TJ the Chainsaw Mechanic]

I wouldn't......

 

[Fruecrue]

How deep is the pores? If its shallow i may run it. But if you can get another i would. Especially if that top end will stay on that saw.

Dug in a bit with a needle file.
Definately a void, good news is I hit the back.

 

[Moparmyway]

A snowball would have a better chance in an active volcano than that piston would have in any cylinder of mine

 

[Fruecrue]

A snowball would have a better chance in an active volcano than that piston would have in any cylinder of mine

 

[fearofpavement]

I'd run it. Still a lot of material left. Not likely to fail.

 

[stihl_head1982]

no way. Not in any saw of mine.

 

[dall]

that spot looks to me like the metal was too hot and started to melt

 

[bikemike]

Intake or exhaust side. If it's the cool side I'd run it. Exhaust side I'd sent it back

 

[fearofpavement]

Those types of "voids" are common in many types of metal castings. A lot of times they're only visible when the part has failed. I don't think this one is significant enough to make a failure likely. I would prefer a piston not have this but wouldn't worry about it if I put it in a saw.

 

[jake wells]

fill it with devcon or jb weld.