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Author Topic: 372XP X-Torq Modding  (Read 34646 times)

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Offline ehp

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Re: 372XP X-Torq Modding
« Reply #20 on: January 01, 2016, 11:47:01 am »
any saw pretty much can be made to run if you want to spend enough money and throw enough parts at it , I myself donot like running anything over a 22 inch bar on any 562 , In my area I cut lots of white oak and that wood is really hard to get enough bar oil to the saw , A 24 inch setup is to dry on bar oil for me but at 22 inch it does the job . I only put the 28 inch on it to show people that the 562 can pull it and pull it well, in softwood ya maybe I would use the 28 inch more but not in this hardwood

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #21 on: January 02, 2016, 08:31:57 am »
I tore my 72 down yesterday and I'm happy with the results...as expected.  My  squish is now .025 and I also matched the lower transfers to the crank case.  I tried to post pics of the end result but they are the wrong format for this site. Question:  Have any of you trimmed the bottom of the cylinder to get better flow to the lower transfers on an XT?  I didnt, but there is a lot of obstruction that protrudes into the case.  Thanks

Josh B.

346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #22 on: January 02, 2016, 09:28:39 am »

And interesting video from one of the Pioneer's in this game...something for everyone here relative to technic and subjects like base gaskets etc...

Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #23 on: January 02, 2016, 10:32:58 am »
Good video but definitely beyond my capability at this point.  Can you offer an experienced opinion regarding trimming down the bottom of the cylinder near the transfers?  Thanks

Josh
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #24 on: January 02, 2016, 11:24:47 am »
I don't have a X-torq cut that way at this point. So really can't comment. Certainly with conventional 372 cylinders. My concern on those saws is the convoluted piston and resultant bearing surface change along with making certain making that change doesn't interfere with the "xtorq charge" channel cut in the piston. So at this point I wouldn't until I can see it, measure, then test for a period of time.

One thing I do see is now there are after market cylinders to test on! (search Husqvarna 372 X-torq in eBay for the 80 dollar option.) Maybe I'll get a bunch and see what I can do. I have to confess I moved right from conventional 372 cylinders on to 562's this past few months. Kind of skipped over the 372 xtorqs.  With the advent of low cost therefore low risk cylinders to hack at, maybe I'll revisit those.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline RIDE-RED 350r

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Re: 372XP X-Torq Modding
« Reply #25 on: January 02, 2016, 11:50:41 am »
The OP is my brother and he and I did our 372's yesterday in his shop. Mine is the 75cc XPW and of course his is the XT...

With his top end off, I really don't see how this is a strato cylinder. It does not have the second butterfly along the carb that specifically feeds strato ports as I have come to understand them. What seems more in line to the XT 372 cylinder is that it has a 2-stage intake cycle. There is a small, single intake port in the customary location, and then there are the additional 2 intake ports about the same size as the transfers. Those "secondary" intake ports are being fed by the carb along with the main intake.

Am I missing something here that makes this a strato cylinder?? It is my understanding through learning here and other forums that the strato cylinders have separate fresh air ports that are isolated from the main fuel/air intake port that is regulated by a separate butterfly. This XT cylinder has none of those components or characteristics.

Edited to add: I am learning fast through the generous sharing of experience and wisdom here, but by no means do I claim to be the expert. Ready to stand corrected if I am incorrect in my assertion.
Swedish, you know, like the chef.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #26 on: January 02, 2016, 12:18:49 pm »
No.. you are dead on. Nothing like the 562's or even the old 455's.  Just I was able to get more results with a tweaked 372 cylinder, or even the 52mm AM cylinders tweaked per amount of time spent with my knowledge set and limitations. And with the XPW... they have goofy transfers but even so, just getting the squish right and a simple muffler mod made a noticeable difference. So I have to defer to others for x-torq knowledge rather than re-invent that wheel. Only so much time! There are two guys who have spent time there. One "Terry Syd" has posted on the "strato" subject. The other is over at another site on specifics to the X-torq.

Maybe you can do some research and add to the collective knowledge here?? Would be nice to see someone focus on those X-torq cylinders.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #27 on: January 02, 2016, 12:35:13 pm »
I didn't cut the cylinder for the exact reasons you stated...skirt support, piston port function and finally X-torque flow alteration.  The bottom of the cylinder has a very unique cut as compared to a traditional 372.  That alone made me pause I think that it may not be wise to grind on a prayer.
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #28 on: January 02, 2016, 12:42:05 pm »
I didn't cut the cylinder for the exact reasons you stated...skirt support, piston port function and finally X-torque flow alteration.  The bottom of the cylinder has a very unique cut as compared to a traditional 372.  That alone made me pause I think that it may not be wise to grind on a prayer.

So now we have three folks (u me and red) interested in these things .. maybe we should put some time into them.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #29 on: January 02, 2016, 12:58:17 pm »


So now we have three folks (u me and red) interested in these things .. maybe we should put some time into them.
[/quote]

Sounds like a plan.
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #30 on: January 02, 2016, 01:03:04 pm »
Ready to stand corrected if I am incorrect in my assertion.

Well Red....I have ONE assertion.. That is that since Eli Tomac flew away to Kawasaki...

The "Wing" doesn't have a "Prayer" this year in Super Cross... :)
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline 49er

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Re: 372XP X-Torq Modding
« Reply #31 on: January 02, 2016, 01:26:41 pm »


So now we have three folks (u me and red) interested in these things .. maybe we should put some time into them.

Hey, count me in I have a 365 I plan on doing more mods to.
Husqvarna EC390 365xt
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Offline 49er

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Re: 372XP X-Torq Modding
« Reply #32 on: January 02, 2016, 01:42:54 pm »
The OP is my brother and he and I did our 372's yesterday in his shop. Mine is the 75cc XPW and of course his is the XT...

With his top end off, I really don't see how this is a strato cylinder. It does not have the second butterfly along the carb that specifically feeds strato ports as I have come to understand them. What seems more in line to the XT 372 cylinder is that it has a 2-stage intake cycle. There is a small, single intake port in the customary location, and then there are the additional 2 intake ports about the same size as the transfers. Those "secondary" intake ports are being fed by the carb along with the main intake.

Am I missing something here that makes this a strato cylinder?? It is my understanding through learning here and other forums that the strato cylinders have separate fresh air ports that are isolated from the main fuel/air intake port that is regulated by a separate butterfly. This XT cylinder has none of those components or characteristics.

Edited to add: I am learning fast through the generous sharing of experience and wisdom here, but by no means do I claim to be the expert. Ready to stand corrected if I am incorrect in my assertion.

As far as the xt being a "strato," it is. It just has two paths through a single throat. The intake that has fuel air mix is relatively small but add the strato ports and the intake path is huge. The theory is get both sources of air into the cylinder where it is mixed together on the compression stroke. Very large potential for performance here.
Terry Sid posted a great thread on this in another location. The only experienced porter that has taken a shine to the 372xt I know of is ehp. Other porters are unenthusiastic at best. IMO.
Husqvarna EC390 365xt
Jonsered 2188 2165 2260 2253 70e
Redmax GZ4000

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #33 on: January 02, 2016, 02:44:24 pm »
I think we should do first a Upstate New York GTG/Build off of 356/372 X-torqs this winter or spring time... all three of us, (Maybe Spike60 makes 4?). Do another one either late in the year or early next year with what we learned by doing and invite a few more if there is interest. Maybe getting a few involved we can develop a good solid build that's fun to run and others can replicate. This stuff isn't rocket science... but it does  take time and understanding of fundamentals to make it a worth while endeavor.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline RIDE-RED 350r

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Re: 372XP X-Torq Modding
« Reply #34 on: January 02, 2016, 02:45:15 pm »
Lol!! Point taken.. ;)
Swedish, you know, like the chef.

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #35 on: January 02, 2016, 02:46:25 pm »
I wonder why there isn't enthusiasm for x-torqs considering mine runs no different than my brothers XPW 75cc stock to stock.  I would think the porting crowd would be all over a saw that runs that strong in stock trim.  Strange.  Here's hoping the pro's take another look at them.  There's a lot of us running them.
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline weimedog

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Re: 372XP X-Torq Modding
« Reply #36 on: January 02, 2016, 03:16:11 pm »
I can speculate. (But then have to go to work..:( ) It has to do with what you have both the tooling and experience for. A lot of what you do with the "conventional" cylinders translates from one to the next. So you can stay in your skill set/power curve work on them. It takes a lot of time and research to develop a build concept that's something your willing to put out in the market place. That combined with the onslaught of new Stilh and Husqvarna Strato saws like the 562/550 MS661/461 etc. the band width of those with the shops has limitations. Add that all up? 372xt's has less support than other saws. So ... maybe it would make sense to dive in and see what's available. As I mentioned, there seems to be more aftermarket support for them now. I have a blown up one on the bench but plan to just do my standard routine which is: ... muffler mod, no base gasket, re-sealed transfer caps, a intake boot (the latest of the four options!) ,cut a bit off the fin by the plug wire etc. It's getting "Nachi's" for bearings and new case seals as well.
Husqvarna 365sp/372xpw Blend, 365/Huztl 52mm build (Cyclops),562xp "HTSS", 272XP, 61/272XP, 555, 257, 242, 238, 440e, Homelite 540, S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, 49sp, 621; Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #37 on: January 02, 2016, 04:47:47 pm »
I was hoping Spike60 would chime in on this thread at some point, he seems to be one of the few that has any interest in the x-torq saws.  I would love to be somehow involved in a build off.  I may not bring experience to the table with regard to porting but I would be happy to help in any way I can.  I'm sure my brother Ride Red 350R would lend a hand as well.   Please keep me posted.
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
Homelite (Solo) 340

I'd rather be in the woods than on this computer.

Offline CR888

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Re: 372XP X-Torq Modding
« Reply #38 on: January 02, 2016, 05:57:32 pm »
The strato design is what we have now on modern saws, builders I suppose are used to older prooven designs and methods. The xt has some good things going for it in its design but many find the xp easier to get the numbers they want with less work involved getting there. We don't have the xt in OZ, unfortunately we can only buy XP'S. (smiley face)

Offline RIDE-RED 350r

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Re: 372XP X-Torq Modding
« Reply #39 on: January 02, 2016, 08:31:25 pm »
I would certainly be in for some shop time.

Just not sure I can muster the coin for another saw to experiment with... And I don't think I can part with my XPW to trade in on an XT.

I am in the beginning stages of skimming some $$$ out of the family budget to piece a 394 together.. I have a dirty cylinder..that's it so far! LOL!
Swedish, you know, like the chef.