Husqvarna 564xp porting

[Tomos770]

It doesn't matter. Port finish has no effect on unsteady gas flow in a duct. This is because the area next to the surface sees little movement.
The only port I want with a fine finish is the exhaust port for the purpose of limiting carbon buildup.
The piston is no doubt on the heavy side. Strato pistons always are.
I do wish it had a Mahle cylinder.

Wonder what changes AI + supercomputer driven future will bring to the table....

Frontier supercomputer uncovers why worn turbine blades drain jet fuel

Scientists have used the Frontier supercomputer to find how microscopic turbine blade damage cuts jet engine efficiency and durability.

interestingengineering.com

 

[hacskaroly]

Wonder what changes AI + supercomputer driven futer will bring to the table....

There will probably be another article which will be titled: "Frontier supercomputer uncovers why worn chainsaw chains aren't as efficient" - "Scientist have used the Frontier supercomputer to find how microscopic cutter damage cuts chainsaw chain efficiency and durability..."

 

[jurchybald]

After running my ported 564xp for a week there is not much wrong I can say about it. Ergonomically is in the class of its own. It's way more powerful than 562xp. Efi gives it instant throttle respond and muff modded is not that loud. Comparing it to 400.1 is ridiculous in every espect except build quality.

 

[bwalker]

After running my ported 564xp for a week there is not much wrong I can say about it. Ergonomically is in the class of its own. It's way more powerful than 562xp. Efi gives it instant throttle respond and muff modded is not that loud. Comparing it to 400.1 is ridiculous in every espect except build quality.

Sonyour thinking its superior to a 400.1? Care to go into that in detail?

 

[Jake Dykstra]

Sonyour thinking its superior to a 400.1? Care to go into that in detail?

I dont have a 400.1 but I have an Eathan Trainer ported 400! Its pretty dang strong. Not sure if my 564 can keep up. Only one way to find out!

 

[ZERO]

After running my ported 564xp for a week there is not much wrong I can say about it. Ergonomically is in the class of its own. It's way more powerful than 562xp. Efi gives it instant throttle respond and muff modded is not that loud. Comparing it to 400.1 is ridiculous in every espect except build quality.

Nice work Sir.

Let us know how you like it long term after break in.

 

[jurchybald]

Sonyour thinking its superior to a 400.1? Care to go into that in detail?

IMHO it is much better saw for daily use. Antivibration system is near perfect. It seats in my hands like a violin. I'm much more precise on stump than I was with 562xp. It has more power than 401 and it starts every time. Something I cannot say for 401. And damn thing vibrates like crazy.
Nevertheless it is build like all 5 series husky. Chinese bearings, gilardoni cylinder that you just look at and it's flaking off. We'll see how long can it takes the beating we are giving it

 

[Tor R]

Chinese bearings

I think they have phased over to HQV as one of their bearing supplier, and that is as far as I understand a German brand.

 

[jurchybald]

Hqw yes. You are right. It's german brand. I saw nylon cage and think china..

 

[Tor R]

Hqw yes. You are right. It's german brand. I saw nylon cage and think china..

Composite materials can be very strong, and withstand high temperatures, and unlike metal, can have less material dimensional change in temperature changes.

In terms of appearance, it looks more like a peek than anything else, it must have been closer to 7-8 years since they changed it.

 

[jurchybald]

Had some time today and tested cutting speed with same bar and chain. Stihl was actually little faster. But it's a vibrator comparing it to husky. And I did only 2 huskies so far.

 

[bwalker]

Had some time today and tested cutting speed with same bar and chain. Stihl was actually little faster. But it's a vibrator comparing it to husky. And I did only 2 huskies so far.

This seems to be the consensus. The 400.1 is a hair faster.

 

[mainer_in_ak]

I’m also not a huge fan of the really deep honing marks, but I suppose nitpicking isn’t warranted unless they actually have some teething problems.

When I see cylinder-honing as crude and course as these 564's, I cant help but think:
Tremendous amount of heat created during break-in.

When mine finally arrives, I will only be limbing with fresh loop of full skip and no change to the factory rakers for a half dozen tanks.

 

[bwalker]

When I see cylinder-honing as crude and course as these 564's, I cant help but think:
Tremendous amount of heat created during break-in.

When mine finally arrives, I will only be limbing with fresh loop of full skip and no change to the factory rakers for a half dozen tanks.

I would think quicker break in myself.
Ever seen the hone marks on a Honda two stroke cylinder? Very similar to thr 564xp.
Taking it easy during break in is about the last thing you should do. I purposely load OPE higher during break in.

 

[ZERO]

When I see cylinder-honing as crude and course as these 564's, I cant help but think:
Tremendous amount of heat created during break-in.

Heat seems to be noticed from the exhaust/top after a hard run on bone stock early versions during break in.
Restrictive exhaust, or cooling not designed properly?

Is the heat build up vaporizing fuel causing hot re-start issues seen on some bone stock models? Or is it a fuel mapping that will get corrected with future AT updates?

 

[Seachaser]

Have they stopped shipping? Donnie Walker had a video a day or two ago about the heat build up and breaking in. Still said it may be the best saw Husky ever made.

 

[bwalker]

Heat seems to be noticed from the exhaust/top after a hard run on bone stock early versions during break in.
Restrictive exhaust, or cooling not designed properly?

Is the heat build up vaporizing fuel causing hot re-start issues seen on some bone stock models? Or is it a fuel mapping that will get corrected with future AT updates?

More than likely its just tuning.
Guys are use to saws that are tuned to rich.

 

[mainer_in_ak]

I suspect this is why they went to an outboard clutch and touted "superior handling" as the end result. Everybody wants an inboard clutch, we're not that gullible. I wonder if they tested an inboard clutch prototype and it couldnt get rid of the heat.

One particular saw of mine with an inboard clutch, when its tuned perfectly, the peak power is notable. It also melts plastic oiler gears in the summer when tuned for peak power. 1/4 turn richer on the high jet, the peak power aint there, but the melted oiler gear problem goes away.

Guess what they'll do with the tuning-reflash to fix the problem? They'll richen up the fuel.

Hahahaha. Carburetors are so fkn simple. You can do that yourself without a visit to the dealership.

 

[bwalker]

I suspect this is why they went to an outboard clutch and touted "superior handling" as the end result. Everybody wants an inboard clutch, we're not that gullible. I wonder if they tested an inboard clutch prototype and it couldnt get rid of the heat.

One particular saw of mine with an inboard clutch, when its tuned perfectly, the peak power is notable. It also melts plastic oiler gears in the summer when tuned for peak power. 1/4 turn richer on the high jet, the peak power aint there, but the melted oiler gear problem goes away.

Guess what they'll do with the tuning-reflash to fix the problem? They'll richen up the fuel.

Hahahaha. Carburetors are so fkn simple. You can do that yourself without a visit to the dealership.

Husky didnt go to an outboard clutch. On their 50 and 60CC saws they have always had them. Outboard clutches kinda suck for putting chains on, but its not a huge deal once your use to it. Getting the hot clutch away from the crank bearings isnt a bad thing. I do believe the outboard clutch improves handling.
In regards to tuning. I would speculate the tuning wasnt properly optimized for our fuel. Fantic had the same problems when the introduced their XE300 dirtbike here. It ran fine in Europe for several years previous to the US intro, but once it arrived here it had issues. Which is why I dont jump on the band wagon and buy new models right off the bat. I'd rather not be a beta tester paying for the privilege of testing...
As for carbs. Average guy can't tune one to save his life.

 

[Tor R]

The only time Husqvarna has used an inboard clutch on a 60cc class was with the 362 XP which is based on the 372xp platform but with a short bar mount.

All other 40, 50, 60 cc classes have had an outboard clutch. The main reason is that these classes are like all-round machines, should be suitable/best in pruning, and the outboard clutch has the advantage of having the bar&chain closer to the center of the saw body.

Those who hate outboard clutches, buy another brand.

PS, Husqvarna has used a plastic worm gear since the 254xp around 1992, and has continued to do so ever since.