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Author Topic: 372XP X-Torq Modding  (Read 47674 times)

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Offline NCFarmboy

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Re: 372XP X-Torq Modding
« Reply #460 on: January 07, 2018, 09:17:13 PM »
I use 80 grit - 120 grit for intake.  Whichever I have on hand.
Shep
Lots & Lots of Saws

Offline EvilRoySlade

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Re: 372XP X-Torq Modding
« Reply #461 on: February 10, 2018, 08:22:13 AM »
I can’t really tell but it looks like you didn’t open your intake window yet. You want to grind the upper part of the intake all the way up to the bottom of your piston skirt when at TDC. Always be sure to check where your ring is at BDC though before grinding. You’ll be fine in this case but no sense ruining a cylinder just cause someone said it’s okay.

Don’t go any wider though, it’s been mentioned earlier but it should be brought up again.

Offline Rx7man

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Re: 372XP X-Torq Modding
« Reply #462 on: August 12, 2018, 02:03:53 PM »
Wow, that was a marathon read to get through 24 pages, but I enjoyed it a lot.. I got a 372xt and the P&C aren't in that great shape so since I can't leave well enough alone, I'll fiddle with it!.. This is the only place I've seen a discussion that says you can get significant power gains from an XT saw, which makes me happy.

I am no pro at porting, but I've done a dozen or so saws of my own, I own half a dozen L65's, and they're a great learning platform since they're a pretty poor performer from the factory.  On my wildest one, I was going for top end power, so I went aggressive on the intake and exhaust durations, about 170* of exhaust and because of more machining of the base after porting the intake I ended up with about 180* of intake.. It sounded great on the bench free revving but it was an absolute dog in the wood, it was untunable because of intake reversion (when the intake charge reverses, the carb doesn't care which direction the air is flowing, so it adds fuel once the first time through, once on the reversion, and then once more as it draws it back in).. so at low RPM it was pig rich to be right at high RPM.

I came to the conclusion that my best gains would come from transfer port work since these saws had tiny transfers.. I had already done a little bit of work to them, but a lot more could be done.  They were a bottom fed closed transfer design and I converted them to a piston and bottom fed design, much like a 394 or Jred 930.. I windowed the piston and cut massive amounts from the cylinder wall.. I was limited in what I could do to the upper transfers because I don't have a right angle grinder small enough so I notched the piston to get more open time.  I was actually looking for more case volume because I wanted to lower the harmonic frequency in the case to reduce the reversion.. Basically a slower moving charge over a longer period of time because of the greater case volume.  
By the time I was finished, it felt like a whole new saw, stall RPM went up considerably from stock, so more low end torque, and in-the-cut RPM went up a lot, with more power everywhere.. It was very rewarding!

Now on the the XT... I haven't really studied it that much yet, but there are some things I'm surprised haven't been brought up yet.. In strato form, the bearings should be getting much better lubrication since the mix is quite rich to the bottom end, more important the less oil mix you run (like many of you, I like 32:1 for a hard working saw)
I haven't had the piston/cylinder in my hand very much to examine how the strato ports work, but since they go through the piston, that's a little bit of cooling to be had, but I haven't seen any one doing any smoothing/polishing on the piston cutouts, and it may be possible to change some of the timing there as well, though it looks hard to measure.  

Anyhow, I loved this thread (including the squarebody talk, I have '92, 93, and 94 dodge diesels, and have less fond memories of the '80 Blazer (I lived in it when I was too broke to afford rent))

Look forward to tearing my saw apart again when new rings get here and doing some work to it.. I think I'll try leaving it as a strato from the choke onward, and removing the divider in intake elbow, at least for now.. I want to see what I can get out of it without making it too thirsty.  Thanks for all the info and the great read!
Husky 2100x4, 394x2, 372xt, 288xp x2, 272xp, L65x6, "277" pipe saw
Stihl 064BB, 044, 028, 009L
Bunch of antiques and others

Offline ehp

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Re: 372XP X-Torq Modding
« Reply #463 on: August 15, 2018, 01:01:20 PM »
I still say one of the best motors out there, I got XT's that I ported out in the field that are still going being used by loggers and are 5 or 6 years old . Myself I leave the stock limited coil in saw but advance the flywheel, this stops the saw from over revving and hurting the crank/rod bearings when limbing and stuff . I gut everything but lots of guys donot . One of my own saws that I cut with and setup up will start and run the easiest of any saws you can run . Yep per hour I burn more gas but I cut a lot more wood per hour as well . Will I be rushing out to buy the new 572 , not to likely but that again is my idea

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #464 on: November 21, 2018, 03:17:11 PM »
Iíll be tearing my 372 apart this winter to inspect the plastic caged bearings.  Iíve got a good amount of run time on it now with the unlimited coil.  Iím curious to see how the bearing retainers have held up to the higher rpm.
346XP/NE
357XP...ported by MeDremel
372XP/XT...ported by A. Burr
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I'd rather be in the woods than on this computer.

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #465 on: November 21, 2018, 03:19:37 PM »
Wish I wouldíve known you were at Boonville Ed, Iím only 45 minutes from there and it wouldíve been great to meet you and shake your hand. 
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 ehp

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Re: 372XP X-Torq Modding
« Reply #466 on: November 24, 2018, 01:42:56 PM »
Ya my wife and I went and it was a good show . I have had zero crank problems or bearing problems but I do run 40-1 using what I think is oil . I will not be getting a new 572 now I donot think . I like the little light hotrod saws

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #467 on: November 27, 2018, 04:20:27 PM »
Yeah I hear you on that.  I havenít had any bearing issues with my saws either.  The new 572 intrigues me because itís new, but I wonít be trading in my trusty 372 to get one.
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 MG2186

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Re: 372XP X-Torq Modding
« Reply #468 on: November 27, 2018, 04:29:12 PM »
Ya my wife and I went and it was a good show . I have had zero crank problems or bearing problems but I do run 40-1 using what I think is oil . I will not be getting a new 572 now I donot think . I like the little light hotrod saws
Ed do you still port saws or just your own? 

Offline ehp

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Re: 372XP X-Torq Modding
« Reply #469 on: November 27, 2018, 07:36:39 PM »
mainly my own or a few friends close to me up here

Offline MG2186

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Re: 372XP X-Torq Modding
« Reply #470 on: November 28, 2018, 11:01:20 AM »
Wow, just finished the whole thread. Very good read and super informative. I have a whole new respect for XT saws and will definitely look at them in a different respect. Edís knowledge of these motors seems to be unmatched by anyone Iíve come across. Again good read and great job by all 

Offline barton174

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Re: 372XP X-Torq Modding
« Reply #471 on: January 19, 2019, 07:04:56 PM »
Well, I finally figured out the issue with leaning out and dying at idle after 10-15s! Looking at the IPL, with the machined bottom carb cover, you use only one of the gaskets on the top side of the diaphragm, but I have the stamped cover, and I guess you're supposed to use a gasket on top and bottom of the diaphragm, with said stamped cover. Added the second gasket and boom, idles great!

Mike
Jonsered 490 - Stock
Echo CS-330MX4 - Mufmod + tuned
Husky 371XP - '99 model, Ported + Mufmod + tuned
Husky 550XP - Stock
Jonsered 2166 - "farmer jones"
Husky 365XT - "farmer Jones"
Husky 555 - Stock for now


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