hard time finding the right piston husky55

[pioneerguy600]

Velocity and direction from the upper transfers can be regulated/shaped in the closed port cylinders, open,not so much.

 

[Cantdog]

From what I could tell from the pics that Meteor PC should make a 55 a good runner......way better than the OP 55s and with that CP system I would expect a bit less rpm than the OEM CP setup but more torque from a larger bore and the closed port arrangement.......should work very well......then you could port it and bring the rpm back up some!!

 

[PogoInTheWoods]

I'm wondering if Joey has a newer good link to the vid he shot comparing the stock and massaged versions of his work? Last time I tried to open the vids, I was redirected to somewhere else.

 

[PogoInTheWoods]

The OEM closed port (bottom) definitely has a swept style upper as Joey indicated he recalled. Both the OEM open port and the Meteor are completely linear with the exception of the Meteor having the pseudo-quad divider.

​

 

[PogoInTheWoods]

Three things to consider, port timing, squish and cc`s/shape of the combustion chamber.

May be a more relevant aspect to this whole Husky 55 discussion than the porting itself. Good call, Jerry.

The pic doesn't do justice to the differences of actual symmetry, but it should be fairly evident if one looks carefully at all three cylinders even with the goofy lens angle.

​

 

[PogoInTheWoods]

Pics with better detail...

​

 

[pioneerguy600]

Now you need to plug the sparkplug hole and pipette test the cc`s the combustion chamber will hold. I can visually tell the one that will make the most power easily.

 

[nmurph]

Ya wanna see a small combustion chamber from this family of saws? I guess it's easy to see why these are such great runners. No, that's not a cut squish band.

5K+

I've heard the 590 has a smaller cc than the 55 which shares the same piston. I have one in the shop but I've never been inside of it. I guess I'll have to pull it apart and show all of these sometime (also have a couple of PP 325's)

 

[stihlbro]

Velocity and direction from the upper transfers can be regulated/shaped in the closed port cylinders, open,not so much.

I totally agree!

I'm wondering if Joey has a newer good link to the vid he shot comparing the stock and massaged versions of his work? Last time I tried to open the vids, I was redirected to somewhere else.

I have the video on my phone still, I uploaded to photobucket, I'll see if I can get it on YouTube. Shouldn't be a problem.

 

[stihlbro]

 

[PogoInTheWoods]

Cool. I finally got the other link for the other vid to work, too. Had to jump through some hoops since my browser didn't like something about Photobucket.
Any chance you could upload that one to YouTube also? Seems to represent a bit more drastic difference between the two saws, or mebbe it's just me.LOL

 

[nmurph]

The second one is definitely tuned better.

Do you have any pics of the 590 cylinder, specifically the combustion chamber?

 

[stihlbro]

I can do it tomorrow. Neal, I'll share what I have gathered. It will be later. Gotta go to work.

 

[RedneckChainsawRepair]

2 kinds of OEM 590 cylinders out there. Thinking that is where Joey got the idea from looking at one of my NOS 590 cylinders in a thread.

Nice work SB

 

[RedneckChainsawRepair]

I wont show Joey's before and after pics here out of the other thread. Those are his to post if he wants them here. Joeys started out like the 5000 plus topend and went this direction.

Here is the used 590 top.

NOS 590 top

 

[RedneckChainsawRepair]

Everyone already knows how tight the cc is on the 44mm 5000 plus. Why mine never went 2 piece I wanted it as stock appearing as it could be.

NOS

 

[RedneckChainsawRepair]

used 590 45mm piston




46mm 325 5500 piston

490 590

 

[nmurph]

I didn't know I had a 590 cylinder. I found this today in my boxes of 5K+/590/325/55 stuff.

And a 590 and CP55 piston side by side.

 

[stihlbro]

Sorry fellas, can't find the other video. I still have the saws and might be able to make some new ones.

 

[PogoInTheWoods]

It's the first one you posted in post #55 and also in the link you sent me in the PM. Doesn't work for me with Chrome, but if I copy/paste the link into Firefox it plays...sorta. I downloaded it and it works fine in Media Player.