Piston window designs

[Shibby]

I'm not sure I understand the window design on these two pistons. The first is what originally came in my ms460, but the second is what is all over eBay with replacement cylinder/piston kits. I noticed my mtronic saws have the second design, and wasn't sure if there's an advantage to them in a non-mtronic saw or if it would even work. Any explanation to the two and why I should/should not buy one over the other is appreciated!

 

[huskihl]

1st pic is a windowed piston. Charge flows through the windows and into the transfer ports in the cylinder wall.

2nd piston is a strato charged saw piston. Fresh air flows through the strato ports, into the cutouts in the piston, and back into the upper transfer ports on top of the fuel/air charge. That fresh air purges out the spent exhaust from the previous cycle, as opposed to a portion of the fresh mixed charge being lost

 

[Shibby]

Does the strato charge piston need the special intake side to make it useful? The eBay cylinders look to be the original design with a single round intake hole, not the three hole intake design the mtronic saws have. I'm curious if using a strato charge piston in a non-strato cylinder would even work. The cylinder kits are confusing me because of this.

Edit: I guess after looking at the inside of the cylinder it makes sense the strato piston would still work. The intake has a wide opening at the cylinder wall where the openings in the piston skirt could draw in fresh air. Probably not as efficient as the cylinders made for that piston type, but looks like it would still work.

I guess also with the strato piston with the original cylinder design it's not saving anything because the "fresh" air is actually the same as the carb air path with fuel mixed in.

 

[huskihl]

Does the strato charge piston need the special intake side to make it useful? The eBay cylinders look to be the original design with a single round intake hole, not the three hole intake design the mtronic saws have. I'm curious if using a strato charge piston in a non-strato cylinder would even work. The cylinder kits are confusing me because of this.

Edit: I guess after looking at the inside of the cylinder it makes sense the strato piston would still work. The intake has a wide opening at the cylinder wall where the openings in the piston skirt could draw in fresh air. Probably not as efficient as the cylinders made for that piston type, but looks like it would still work.

I guess also with the strato piston with the original cylinder design it's not saving anything because the "fresh" air is actually the same as the carb air path with fuel mixed in.

I think you’re mixing up the MS460 with a Husky 460 on eBay.
The cylinders and pistons are not interchangeable with each other

 

[Shibby]

Here's one of many that I'm finding.

https://www.ebay.com/itm/3638616747...E9MzGGs6DhzZGVqi7K0Dpj23y8V0|tkp:BFBMhrSq0ONg

 

[srcarr52]

If that is truly the piston that comes with that cylinder kit, it's not going to run worth a darn.

 

[huskihl]

Seller doesn’t know what he’s selling. That piston and cylinder don’t go together

Here's one of many that I'm finding.

https://www.ebay.com/itm/363861674716?hash=item54b7d88adc:g:vM0AAOSwcNlip-Sn&amdata=enc:AQAHAAAA4PFkF4tUvqZ5xlnKz0p4e6snsTxBLreouUrNMVqdGg8D06zQfmnu43dL4VTaWthB+EQKBBN3zjiRopZS4HetjCAvM9WARW0fPfupFTztKkBVrzoUYA8RpQ71+j7Tm4l+ijWDQDZhNWLNMMSU/OVubCw9xobp9v1XvoCCFYyeccUOs9UyUgZhRFI0U1bwKNWjFNs2lpQGDAslhPl7XUvjFPgtNGklcd5H6+C+27oqqRk8qpJizlrXL+2VUogjP0aRFkO/OXyl9gIJHP5XE9MzGGs6DhzZGVqi7K0Dpj23y8V0|tkp:BFBMhrSq0ONg

 

[srcarr52]

Seller doesn’t know what he’s selling. That piston and cylinder don’t go together

It's china... if it sort of fits... it ships!

 

[qurotro]

Does the strato charge piston need the special intake side to make it useful? .

Short answer Yes. Need to split the fresh air and the mixture. But intake design varies.