372xp x torque vs xpw both ported

[sunfish]

48 or 50mm

Right you are, been a while since I messed with 372s'... I'll fix it.

 

[mt.stalker]

It was. It's faster than my 046

Well duh , it's not a creamsicle

 

[mdavlee]

Well duh , it's not a creamsicle

Yep. It's a slow Creamsicle but it starts everytime I try to run it. Well usually[emoji6]

 

[Cut4fun]

Is a 365 special different than just a 365? If so what are the differences. What made this saw so much faster than your 372?

Pulled info below out of this thread. http://chainsawrepair.createaforum.com/husqvarna/husqvarna-365/

Per: spike60
The "special" decals are no help when sorting out which cylinder was used on the 365. That was just a marketing term that came and went on several models, but does not necessarily denote changes with whatever model.

The open port 365/2065 jug was only used the first year or so here in the US. First year IPL's are the only ones which only list the open port cylinder.

The closed port 372 style cylinder was listed in IPL's as the "EPA" cylinder. Much confusion arises from the fact that the open port cylinder was still used on saws in other markets well after we received the closed port style. IPL's for many years listed the part numbers for both cylinders. Part numbers with "691" as the middle 3 digits are the open port jug. Part numbers with "939" in the middle are the closed port cylinders. Only the closed port cylinder, #503939005 is currently available.

There are no service bulletins that list a serial number brake for when the change to the closed port jug took place. Again, I think continued use of the open port piece in other markets is likely the reason for this. But it's safe to conclude only the 1996 and some 1997 365/2065's arrived here with the open port top ends. There is a service bulletin that lists the change to the Walbro carb as taking place in week 26 of 2000.

Personal opinion: The 48mm closed port cylinder is very underrated. Guys who pull a perfectly good 48mm closed port cylinder off a 365/2165 in favor of the 50mm unit are wasting a very good cylinder! Those saws can easily be made to out cut stock 372's with just a little "lovin". If it's toast, then replace it with the larger cylinder. But if it's in good shape, it's not worth the expense of a new cylinder for the small gain in power.

 

[Cut4fun]

I really really like my 375K cylinder that was ported by Dan Henry before the XPW 74.66c cylinders were ever used.

This 375K saw pulled a 32" just as hard in the cuts as it would the 16" for fun.

 

[Cut4fun]

Same woods ported saw cold start racing in a alky nitro 5ci class. 93 octane 32:1 KL-200

The one with a azz in your face.

 

[RIDE-RED 350r]

I am very pleased with the way my ported XPW came out. I did it myself using Randy's XPW build thread over on AS as my guide. From the first simple base gasket delete mod to the final mod to porting making the saw the way it is now, I went in several stages. I think I had the top end off about 6 times from start to finish.

All said and done what I did to it was:
-dual port muffler
-base gasket delete
-lower transfer blending/beveling/case matching and removing the large humps in the exhaust side transfers
-set exhaust at 100 deg
-set transfers at 122 deg
-squared up intake, left timing where the base gasket delete brought it
-widened exhaust port to 70% of bore diameter and enlarged entire exhaust outlet, matching the heat shield and muffler to it
-filed flywheel key about .020 advancing ignition timing
-installed unlimited OEM coil

In the video posted below, I was still tuning up and at that point it was spooling about 13.6k no load. After the vid I was able to tune it up to 14.4k no load and still had a little bit of 4-stroking. I have since backed it off to about 13.8-14k for regular work. I couldn't be happier with the gains I made, especially for my first real porting job. I'm still getting used to the sound of my 372 spooling 14k or more!

My brother @XP_Slinger has a 372 XT and he modded his saw step by step along side me as I was doing my XPW. His saw came out very strong as well. I don't have any vids of his but I tagged him so he sees this thread and will post his vids and timing numbers along with other mods he has done. All in all, I don't think there is enough difference for a human being to be able to discern between our two saws as far as a "seat of the pants' feel. He says mine can be dogged into the cut with a little more force than his, but myself, I can't really tell a difference.

Basically, I am saying that I agree with those who have stated that it's too hard to tell the difference. And yes, the XT is easier to port.

It should be noted that this green soft maple was not the best log to really strength test a saw, but it was the best we had in the log pile at that time.

 

[XP_Slinger]

I still say the "W" has a little more attitude Joe but given our saws cut within a 1/2 second of eachother at Walts place favors your opinion. So anyway, here's what I did to my XT:
- Base gasket delete, .024 squish
- dual port muffler
- De-stratofied
- Advanced timing
- Unlimited coil
- Exhaust widened to 62% of bore dia.
- Exhaust raised to 98°
- Transfers raised to 117°
- Intake advanced to 77° (as is w/out. gasket)
- In addition to the adjustments in timing, I also did A LOT of work on the exhaust passage between the window and muffler. The transfers got a lot of attention as well, they are widened from the lowers all the way to the window.
I'm proud of how it turned out, but I think the XPW holds RPM better when you lean on it.
The first video is with a 24" bar and a stihl RS skip chain. The second video is with a 20" bar and a full comp Oregon chain. BTW...if you're ever in need of an ego boost just cut some green soft maple...lol

 

[Spike60]

If that's what you want go to a 365 special or 50mm top end. Here's a 65cc saw in the same log with a good chain. It just turned out way faster than I expected for 65cc.

YES! Everybody ignores the 48cc top end from the 365, but like you are showing they can be made to really rip. That saw's running real good. Good job Michael!

Just think how many of those top ends got yanked and tossed on a shelf somewhere for a Chinese big bore kit.

 

[XP_Slinger]

YES! Everybody ignores the 48cc top end from the 365, but like you are showing they can be made to really rip. That saw's running real good. Good job Michael!

Just think how many of those top ends got yanked and tossed on a shelf somewhere for a Chinese big bore kit.

I'm sure the "no replacement for displacement" mentality has doomed many good saws and parts to the garbage can or the junk shelf. A shame...

 

[Spike60]

I'm sure the "no replacement for displacement" mentality has doomed many good saws and parts to the garbage can or the junk shelf. A shame...

Without a doubt. And normally it makes sense, but not in this case.

I built one of those myself on an old 371 that led a real hard life. I was surprised at how mine came out also. I handed it to a guy cutting with a stock 372 and after he ran it, he asked, "Is that the big bore kit?" "No, it's the smaller one from a 365." "Huh?"

 

[mdavlee]

I've got them for cheap. Bet 99% wouldn't be able to tell one from a 70cc