Ronie's 660 kit saw

[MustangMike]

Many of the Cross cylinders ran well, they were NOT BB.

I think a lot of the AM cylinders have poor transfer ports.

 

[Ronie]

Many of the Cross cylinders ran well, they were NOT BB.

I think a lot of the AM cylinders have poor transfer ports.

I agree

 

[farminkarman]

Wonder how many oem cylinders have been thrown out because their new hot rod BB cylinder “runs so much better”.

Especially the Husky/Jred 48mm cylinders on the 2165 & 365 Special. Those OEM cylinders run pretty good IMO.

 

[Ronie]

I've swore off AM cylinders multiple times and like a crack head I keep falling to the temptation. They are good to practice porting on and for most of them that's it.

I'm sure there's some goods one out there but I don't know how to tell the good from the bad..

 

[MustangMike]

I've not been able to get any of the AM 440 BB cylinders to run as well as I'd like.

I do have 4 OEM cylinders that I plan to play with in the future, but no time now. (044, 440, 046, 460).

I my go with one of the smaller cylinders first, as sometimes it seems 460 cylinders are hard to make run right on 440s.

 

[Ronie]

I've not been able to get any of the AM 440 BB cylinders to run as well as I'd like.

I do have 4 OEM cylinders that I plan to play with in the future, but no time now. (044, 440, 046, 460).

I my go with one of the smaller cylinders first, as sometimes it seems 460 cylinders are hard to make run right on 440s.

Do you have any 361 cylinders? I've got one of them kits and I'd like to put and OEM one on it if I can.

 

[Maintenance Chief]

Wonder how many oem cylinders have been thrown out because their new hot rod BB cylinder “runs so much better”.

I keep all my oem cylinders! Especially when they're fixable.
I hope people aren't tossing them for AM parts. I have a couple that are even missing chrome, incase plating becomes doable again.

 

[Maintenance Chief]

I've swore off AM cylinders multiple times and like a crack head I keep falling to the temptation. They are good to practice porting on and for most of them that's it.

I'm sure there's some goods one out there but I don't know how to tell the good from the bad..

I've had some very good luck with both cheap and pricey AM cylinders, the one thing I always do is use Cabers rings.
I don't know about anyone else but I have my OEM saws or classic saws and then I have my fleet of scrap/junk yard saws that would more than likely be Toyota wheels if I wouldn't have picked them up , so just being able to build a old broken saw from new clean parts is the goal.

 

[Ronie]

I've had some very good luck with both cheap and pricey AM cylinders, the one thing I always do is use Cabers rings.
I don't know about anyone else but I have my OEM saws or classic saws and then I have my fleet of scrap/junk yard saws that would more than likely be Toyota wheels if I wouldn't have picked them up , so just being able to build a old broken saw from new clean parts is the goal.

I've also had some good luck using Hyway cylinders to get saws going, they ran good but probably not as good as OEM. The Hyway I ported and put on my 288 ran very good.

 

[Maintenance Chief]

Yeah, its like this ;if I am going to cut down a dangerous tree for forestry or property management I more often take an OEM or well used saws. If I'm cutting fire wood in the back yard ... well I'll play around with anything .
I'd have to cut ALOT of trees with any saws ,to even remotely catch up to with what I've cut with my ProMac 700.

 

[MustangMike]

I have 6 OEM cylinders I plan to play with (eventually), not counting the early 880 that I have the whole saw, B+C (41" 404).

The play cylinders are 044,440, 046(D), 460, 066 (decomp), 660.

 

[Nutball]

Made a quick cut with the OEM cylinder, it's faster, more torque and just feels so much better in the cut and it's not even tuned, just one turn out on the screws. Them other cylinders are turds compared to the OEM one that has almost nothing done to it.

Now you need to try to match the AM to the OEM and learn what makes OEM so good as far as ports and combustion chamber go.

 

[Ronie]

Now you need to try to match the AM to the OEM and learn what makes OEM so good as far as ports and combustion chamber go.

I think it's the transfer direction and maybe the inner shape.

 

[farminkarman]

I think it's the transfer direction and maybe the inner shape.

I would be curious to see what the volume of the transfers are on the stock vs. AM…although it would be a challenge to cc the transfers like you would a combustion chamber.

 

[Nutball]

I took pictures and some width measurements of OEM vs AM 395. Big difference. The AM had significantly narrower transfer tubes, but similar uppers. The big bore version unnecessarily had even narrower tubes because they moved the inner tube wall to make room for more bore when there's enough material to have left it like the 56mm and bored it larger.



And the AM passes less than half the air through the fins than the OEM.

 

[Maintenance Chief]

What brand AM are you using for the comparison?

 

[Nutball]

Hyway. I wouldn't be surprised if some cheapie chrome bore had better lowers. And better fins. I've seen some really thin finned chrome bore AM Stihl cylinders

 

[Nutball]

I ported a Meteor 661 cylinder and it was still 8% slower than stock oem. Pos

Did you ever do a close side by side comparison to figure out why the OEM was so much better?

 

[huskihl]

Did you ever do a close side by side comparison to figure out why the OEM was so much better?

Yep. The meteor has a corner that protrudes too far into the main transfers. Can feel it and see it with a mirror but it’s inaccessible from the inside. Could grind through from the outside and patch it afterwards but it would still be difficult to grind the jb from the inside

 

[Jason628]

Just ordered another 660. My buddy tried out mine and decided he wanted one...