661 Stroker

[Redfin]

I thought my 394 was wide but damn.

If ya gots the skirts to cover...

 

[tickbitintn]

Because it’s a stihl and they can. Lol

Yeah probably that!!!

Sent from my XT1635-01 using Tapatalk

 

[MustangMike]

What ever they are doing, it obviously works!

OEM jugs are sought after!

 

[Deets066]

What ever they are doing, it obviously works!

OEM jugs are sought after!

Husky plating is more like nikasil and much better.

 

[tickbitintn]

Husky plating is more like nikasil and much better.

Unless its on a 359. For some reason it is very thin on that model.

 

[huskihl]

Unless its on a 359. For some reason it is very thin on that model.

That’s the only scored cylinder I haven’t been able to save. One tiny little mark and I sanded through in about 10 seconds

 

[huskihl]

Husky plating is more like nikasil and much better.

Well there ya went and did it

 

[Lightning Performance]

Husky plating is more like nikasil and much better.

Just finding that out recently myself. These 394 pistons get destroyed from poor port work with no chamfers on the windows, sad. The plating still looks like new in this jug. Hacked it up some more.

Only cleaned up one other Husky 372 saw. The jug that crossed my bench burnt some years back. Put a Meteor kit it.



Do you stroked hooligans think cutting off the counterweight some on this 285 crank will run well in the 394 case?
Looking for 0.030 in there or more. Don't want to cut much if any from the cases. This crank needs a diet plan beyond the norm. I'll have it shot peened if needed.

Thoughts...

 

[huskihl]

Just finding that out recently myself. These 394 pistons get destroyed from poor port work with no chamfers on the windows, sad. The plating still looks like new in this jug. Hacked it up some more.

Only cleaned up one other Husky 372 saw. The jug that crossed my bench burnt some years back. Put a Meteor kit it.



Do you stroked hooligans think cutting off the counterweight some on this 285 crank will run well in the 394 case?
Looking for 0.030 in there or more. Don't want to cut much if any from the cases. This crank needs a diet plan beyond the norm. I'll have it shot peened if needed.

Thoughts...

Uhh... what’s a 285?

 

[Redfin]

Same crank as a 2100. Did you verify you have clearance on the small end?

 

[Deets066]

You really don’t want to remove any weight on the counterweights if at all possible.

 

[Redfin]

Pish posh. Barefooted stroked 394 vids are all the rage.

 

[Deets066]

Pish posh. Barefooted stroked 394 vids are all the rage.

Might not be the barefoot stroked vids you are expecting....

 

[Redfin]

Deetle, I always keep my expectations low.

 

[mdavlee]

Well there ya went and did it

At least Husky and Dolmar can run Wiseco pistons with steel rings without counting the cuts you make on your hands and toes before it eats the plating off.

 

[MustangMike]

That may be true, but I have never met a builder who did not prefer OEM cylinders on their Stihl ported saws.

And with Stihl or Meteor pistons, they seem to provide very good service life.

 

[Lightning Performance]

Something has got to go in few places. Considered a slug but gawd dang spensive! Last time I bought Mallory metal was quite a while ago like decades. I can add tinned lead. Watched it done twice on bike cranks a long time ago. Takes a bit to set up the mold plates. Everything shakes with one cylinder motors.
Have one more 394 case to check it in. Doubt much will change. They seem pretty consistent. If I just cut the case it will crack I'm told. Seems logical.

 

[Deets066]

That may be true, but I have never met a builder who did not prefer OEM cylinders on their Stihl ported saws.

And with Stihl or Meteor pistons, they seem to provide very good service life.

Not disagreeing at all, be we are going above and beyond regular ported worksaws. And to do that, you will be plating a cylinder.

 

[MustangMike]

None of my are, or will be, beyond woods port.

 

[Definitive Dave]

OEM bored out and plated is the only way to go.

I totally agree, I know several builders who insist on an OEM jug being sent out and re-plated (preferably by Millenium) before they will accept a saw to build. In addition to the superior plating they are also more meticulous and hone a straighter bore than OEM. If you are fighting for 1/1000th of a second, you do what has been proven to make a positive difference

How many you got now?

Eight so far

Granted these are forged pistons that DDawg had produced (snip), I do believe the comp height and skirts are oem. DD can verify.View attachment 274335

Yep skirt length and compression height are identical to OEM, while the skirt width and other specs are quite different

I thought I read that the bored out jugs were sent out to get chrome lined? Am I mistaken?

Depending on the original plating and the intended use there are a lot of coatings and linings that can be used, Nikasil or a similar HARD plating is required to run chrome-faced steel rings like NPR.
Many cylinders are indeed chrome lined but not many modern era chainsaws.

Where do these bored jugs get sent then? Is it nikasil coated like oem?

Regardless of who bores the jug, I send them out to Millenium (for two piece cylinders) or US Chrome (standard one piece cylinders), there is a place in Europe, but I need to find the info on them again.

Stihl plating is proprietary, more like chrome than nikasil from what I understand.

@Definitive Dave knows all about it.

I still don't quite understand why they use such a proprietary blend, it's not really chrome but not nikasil either.

Husky plating is more like nikasil and much better.

The Short Version:
I did a LOT of research in this area when we initially destroyed several brand new ported OEM Stihl MS661 cylinders in the saws of some good guys who did testing for us.
I eventually talked at length with engineers at Wiseco, Total Seal, NPR, Caber, Mahle, Stihl, Husqvarna, Gillardoni, Meteor, KoblenSchmidt and a couple metallurgists including a Doctoral University Science Department Chair.
Mahle owns Nikasil, period. NOBODY else can use the coating or process. Nikasil is very hard and accepts the rough treatment a plating gets from the Chrome rings.
Husqvarna has been using Mahle nearly exclusively for Pro level chainsaws since the 3 series began, so they are good to go. Since Stihl uses four different manufacturers to ge the best price on their cylinder prep and plating they cannot use Nikasil. They use a proprietary softer plating that Mahle, Gillardoni, Stihl, and KS can all apply identically. So for the 3 series forward Husqvarna cylinders ARE Nikasil. Mahle obviously manufactures cylinders for other companies and uses Nikasil when specified.

What ever they are doing, it obviously works! OEM jugs are sought after!

That may be true, but I have never met a builder who did not prefer OEM cylinders on their Stihl ported saws. (snip)

This is true, but not due to the Plating per se.
Builders like to have a reliable cylinder that is as close to identical from one to another as possible, so they can develop a great "recipe" for that model and not have to start from scratch every time they start work on a jug.
Most aftermarket cylinders don't have that kind of quality control.

Do you stroked hooligans think cutting off the counterweight some on this 285 crank will run well in the 394 case?
Looking for 0.030 in there or more. Don't want to cut much if any from the cases. This crank needs a diet plan beyond the norm. I'll have it shot peened if needed. Thoughts...

The weight of a crank, in conjunction with the balance is a can of worms best left for specialists in my opinion. When we have them stroked for the 3140xp Husky pipe saws, Crankworks does a LOT of different tasks in making the crank perfect. A race saw NEEDS a balanced crank, whether it is stock, stroked, ported or a full circle build. Again when you are looking for 1/1000th, you go where it lives The Mac big motors offered a shot peened crank as a Kart motor option, adopted by saw guys.

Not disagreeing at all, be we are going above and beyond regular ported worksaws. And to do that, you will be plating a cylinder.

This is where Fun lives!!

None of my are, or will be, beyond woods port.

This makes me weep, bro

Dave