2-barrels and a few more pounds (a.k.a. the new Huskies)

[glens]

Ran a 575XP at the Louisville Expo today.&nbsp; It's the replacement for the 372XP which will evidently still be in production through the end of the year (per the words of Mr. <i>something</i>foos himself, who was nice, personable, well-dressed, and has a firm handshake).

The saw (and its small sister, the 570) has a two-barrel carb and the now-only-two (and small) transfers leave the crankcase at the front and wrap around the exhaust on their long way back to the sides.&nbsp; There are two symmetrical ports from the upper air-only barrel of the carb which open before the main intake port.&nbsp; The two air-only ports, through passageways formed in the sides of the piston, draw straight air toward the crankcase, backwards, through the main transfers before the main intake port opens.

The saws are 1.5 lbs. (by Husky's system of measurement, whatever that is) <i>heavier</i> than the 372-chassis saws.&nbsp; Yep.&nbsp; the literature says 14.9 lbs. dry and I have no doubts that figure is as optimistic as any of theirs have ever been.&nbsp; The 575 cuts well enough, but it is a <b>tank</b>.

The 455 has the same sort of two-barrel arrangement, but now has a modular engine with metal-insert-encased plastic crankcase, horizontally split.

If any of y'all like Huskies and want some of the older (lighter, and <i>modifiable!</i>) stuff, you'd better get your orders in now.

Will have pictures to post when they arrive via email from Jeff S. (externals and internals)

Almost forgot to mention the full-circle crank on the 575...

Glen

 

[rahtreelimbs]

There always seems to be a trade off, EPA complient.....more weight!

This is sad to hear as the 372 is such a great saw. Seems that Husky can't even match there own benchmark.


I guess we will have to wait to here more input.

 

[wiley_p]

sounds differeent, wonder if the bottom end is any stronger? Just picked up a new Wood's mod 372, did it for thye price may even be happier about it now.

 

[bwalker]

Sounds like husky is using something simular to the redmax strato charge sytem...Too bad it sounds like these new offerings are over weight clubs....and plastic crankcases. The stihl boyus are going to have a hayday with this one after years of abuse over the o29-039.

 

[glens]

They're bragging up the greater lower-rpm torque and increased fuel efficiency:<blockquote>
The X-TORQ technology delivers up to 10% more cutting power at medium rpms. [sic] This means more power where it's most needed.</blockquote><blockquote>
Our new engine technology combines higher performance with up to 20% lower fuel consumption... exhaust emissions are reduced by as much as 60%... better workplace... protecting environment.</blockquote>
The plastic crankcase comment pertained only to the new "55" (which also felt heavy to me).

Oh, the whole top cover is now one piece on the 570/575XP.&nbsp; Overall the shape is much the same; some rounding/slanting of profiles, etc.

Glen

 

[wiley_p]

maybe this will be the final nail in the coffin for them on the West Coast in the 70cc and above catagory?

 

[rahtreelimbs]

Originally posted by wiley_p
maybe this will be the final nail in the coffin for them on the West Coast in the 70cc and above catagory?

We will have to wait and see what Stihl and the like come out with.

 

[bwalker]

Hopefully NOT a four mix saw.

 

[wiley_p]

I've been mildly concerned about that very thing.

 

[Lawn Masters]

The minute they start selling 4 mix saws I'll buy 2 man crosscut saws and cutting the ole fashioned way. I could use the excercise anyways.

 

[sedanman]

I will be first on line for a 4- mix saw. The torque my fs-110 has is amazing. I will most likely get a 4-mix backpack blower as soon as they are available. You guys don't know what you're missing.


OSA, Have you ever even seen a piece of 4-mix equipment? How can a young man such as yourself be so set in his ways? I think I will refer to you as "pitch-back" after the toy baseball backstop that just throws back whatever was pitched at it.

http://www.sportsunlimitedinc.com/parsunskorzo.html

 

[stihltech]

saws

I really do not care to see a 4 mix saw. The FS110 is a great piece of machinery, but I would prefer to see electronics take over and control the burn. It has done wonders for automotive engines. I think the technology is there, the cost will be the factor to deal with. 1 pull starting, no choke, power as needed.

Let's see what happens.

As for the new Husky and the 029 thing

 

[glens]

This is not the first time Husky has used plastic-bottom horizontally-split crankcases.&nbsp; Merely the first use of them on the 55 (right?).&nbsp; The two larger saws mentioned above have conventional vertically-split metal (ferrous? LOL) cases.

I don't think electronics are going to be able to allay the problem of raw fuel spewing out the exhaust port the way these raw-air-buffer 2-stroke designs do.&nbsp; Unless some method can be found to economically produce high-enough fuel pressure to use in conjunction with injectors, and the electrical wattage necessary to operate the entire system.

It seems as though in the Elux implementation (at least; haven't seen the Redmax) the transfer ports must be long and lean to ensure separation between the buffer/purge air and the combustible mixture.&nbsp; Small diameter, long "throw" valves are what work well in low-speed, torquey 4-strokes and the new Husky configuration appears to match that description.&nbsp; So their new engines seem to make the better power lower in the RPM range, as opposed to their previous method of liking to make high-revving tools.

Maybe these newer saws will pull higher-count drive sprockets in order to maintain high chain speed.&nbsp; I guess that would be acceptable, but the weight is still an issue.&nbsp; Their older saws weigh in at about a full pound more than their claims for them and if these maintain that discrepancy, the 575XP is actually almost the same weight as an 066!&nbsp; I can't see how a 4-stroke engine could command any <i>less</i> weight increase than these designs do.

Regarding my initial analysis (thread starter) of how these Elux engines work, I held a cut-out cylinder in my hand, inserted the piston, and worked it out myself.&nbsp; I'm correct in my description, and if they produce literature that portrays it another way they're untruthful or mistaken.&nbsp; We know the engineering team is not good at marketing, and vice-versa.

Oh, I believe the man's name was <i>Zer</i>foos.

I know that although the saw cut quite fast for me in the approx. 15" hardwood, a fellow came along later who donned the chaps and proceeded to completely bog the saw many times while slowly removing two two-inch-thick rounds (what a waste; my two were only &frac12;" or less).&nbsp; It seems as though the greater low-speed torque still isn't enough to overcome "dogged" over-determination...

Glen

 

[wiley_p]

I think Stihl won't pervert the 460-660 saws in this manner.or the 440 for that matter.

 

[bwalker]

It seems as though in the Elux implementation (at least; haven't seen the Redmax) the transfer ports must be long and lean to ensure separation between the

Glen, the second gen strato engine that is in my Redmax bp blower has a traditionl looking cylinder in regards to port area and design. It has no external tubes or anything of that nature. The ports are in the traditional place and of a average size. About the only differance I can see is the two barrel carb, a real odd piston designthat has port cast into it and removable transfer covers that actually form the top of the transfer where it discharges into the cylinder.

I think Stihl won't pervert the 460-660 saws in this manner.or the 440 for that matter.

Wiley, you can bet they will have to do something. The 044-066 days are limted as they can not meet current emmission numbers with those saws. I dont know what Stihl has up its sleeves, but I bet yoiu could get a good idea by looking at www.delphion.com

 

[Chainsaw_Maniac]

That's aweful. They made the saw heaivier without really increasing performance much. Was it designed by a secret agent from stihl who wants to increase sales of the MS 460?

For me buying a new saw has always been about power to weight retio, and they really screwed it up this time.

 

[glens]

Originally posted by bwalker

It seems as though in the Elux implementation (at least; haven't seen the Redmax) the transfer ports must be long and lean to ensure separation between the

Glen, the second gen strato engine that is in my Redmax bp blower has a traditionl looking cylinder in regards to port area and design. It has no external tubes or anything of that nature. The ports are in the traditional place and of a average size.

I should have said transfer <i>passageways</i> (cast into the cylinder; fully on the 570/575XP, with fastened covers on the 455), not transfer <i>ports</i>.&nbsp; The ports themselves appeared largely "normal" in configuration, if not a bit small.

Oh, the carbs were 3-screw Walbros with mechanically-linked "secondaries".

Glen

 

[rahtreelimbs]

575 cylinder.

 

[rahtreelimbs]

575 carb.

 

[rahtreelimbs]

575 top view.