alleyyooper
Addicted to ArboristSite
So who has a piston and rings?
Al
Al
So who has a piston and rings?
Al
I'm skeptical about this. On a 5000+ or Husky 154/254, there's no unnecessarily thick lower transfer to be ground out. The outside wall of the port follows the curve in the inner sand/glass mould very closely and even with that, the starter side is ground to clear the flywheel.A 51 piston should work but since it’s designed for open transfers and lacks windows you will need to grind out the bottoms of your cylinders lower transfers so they function as bottom fed rather than side fed.
There’s pictures of this process in a few various threads, you’d have to search a bit to dig them up. Might be for different saws such as Jred 490/590 or partner 5000 but still applicable for the 55.
this is the only one i know of. ive heard of others using them, not sure who the actual manufacturer is.So in other words there is no OEM style pistons for this cylinder.
If I don't want to be fooling around just buy a Piston, cylinder Kit and be done with it.
46MM.
https://www.hlsproparts.com/Husqvar...WwEIzC9knJp1jXeqNVBf5z_bIafdYl9MaAgJJEALw_wcB
Al
this is what i did to my 5000 cylinder. as i said earlier, i just drilled holes in the piston that came originally on this 50, 44mm open port. i opened up the lowers the way bill mentioned.
View attachment 730373 View attachment 730374
Without getting into inertia, eddies & boundary layer technicalities, the short, curved, reducing cross-section transfer ports in the 5000+ and Husky 444, 162, 154, 262, etc, are more expensive to make than finger ports. They're made that way in order to deliver maximum mixture at high rpm and so maintain the highest possible chain speed under load.Skeptical is ok.
I'm quite certain it's easily doable, has been done and has been documented.
There's speculation that it runs better that way than the stock piston.
I plan to do a few myself.
I’ve used this piston, and it’s still running. It’s a drop in replacement, for a decent price.this is the only one i know of. ive heard of others using them, not sure who the actual manufacturer is.
View attachment 730441
Without getting into inertia, eddies & boundary layer technicalities, the short, curved, reducing cross-section transfer ports in the 5000+ and Husky 444, 162, 154, 262, etc, are more expensive to make than finger ports.
They're made that way in order to deliver maximum mixture at high rpm and so maintain the highest possible chain speed under load. Lengthening them may move the torque peak lower in the rev range, which could indeed make the saw feel more powerful...or "better", in your hands.
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