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Author Topic: 372XP X-Torq Modding  (Read 41841 times)

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Offline ehp

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Re: 372XP X-Torq Modding
« Reply #440 on: August 07, 2017, 09:40:07 PM »
No, you put engine at TDC and it has to be TDC perfect, fill combustion chamber to second thread on sparkplug hole , measure how much volume of oil you used , next role piston down to BDC fill to second thread on sparkplug hole , measure oil volume used , now you got to have the ports closed off but you already knew this and you would already know the cc volume of the engine . I have a computer program that I put the number in and it can tell me pretty much everything I need  now I can make changes to my ports like transfers that will add cc volume to the crankcase and see how that affects the engine , I also have a engine dyno on computer that I can take a engine numbers and port and the dyno will tell me if they work or if the port numbers are wrong mainly thou on if your over porting a port the computer will tell you that will not work. But I honestly cannot remember the last time I used any of that stuff , Had so many different motors apart I pretty much just look and can tell what I want to do

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #441 on: August 08, 2017, 05:40:23 AM »
Interesting stuff.  I've never measured Case volume, seems like a more precise way to determine what changes should be made to ports. 
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 #442 on: August 08, 2017, 05:47:15 PM »
crankcase volume plays a huge roll in how a motor runs and mainly torque , you can make top end horsepower playing with making the volume larger but at some point it will become a very top couple hundred rpms will be any good to you. But on average most chainsaw motors are to tight and can use a larger crankcase volume and they will make more horsepower but the down side is the engine will also require more fuel and that amount of fuel depends on the amount you increase the cc volume of the crankcase and also with more power you will produce more engine heat which is not a good thing

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #443 on: August 09, 2017, 06:33:37 AM »
Yes sir.  It's that delicate balance that we're all looking to achieve.  It's the difference between a DIY woods port and a pro such as yourself.  I really enjoy learning about this stuff. 
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 EvilRoySlade

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Re: 372XP X-Torq Modding
« Reply #444 on: August 09, 2017, 08:10:17 AM »
Which is were the whole BMEP comes into play correct?  It would be fun to see the simulations on the software to help understand what affects what. Watch what happens when fat lazy transfers are ground and such.

Offline CJBrown

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Re: 372XP X-Torq Modding
« Reply #445 on: August 09, 2017, 09:08:51 AM »
If a larger crankcase volume is desirable when trying to produce more HP, what role do crank stuffers play in some of the production saws? Is it to keep the charge above the spinning crank and out of the bottom of the crankcase? Reduce bottom end turbulence? And how do they affect bottom end lubrication?

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #446 on: August 09, 2017, 09:54:01 AM »
The way I understand crank stuffers is they increase charge velocity and pressure.  Which in turn gives the Saw more torque at higher rpm.  I think...
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 #447 on: August 09, 2017, 06:06:22 PM »
Bmep is a ratio that can help BUT you still have to use common sense cause you can design a engine that has a super high Bmep number that looks on paper or computer screen to be super but in real world terms the engine could never run at that Bmep ratio . Just like most computer software you still need to think , same as building 2 stroke pipes . You need to tell the program what you want to do,

Offline CJBrown

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Re: 372XP X-Torq Modding
« Reply #448 on: August 09, 2017, 06:29:50 PM »
BMEP - I had to look that one up.

Offline SierraMtns

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Re: 372XP X-Torq Modding
« Reply #449 on: December 28, 2017, 12:11:22 AM »
Great thread.  I am currently porting my 365 x-torq.  This is the first time I have ported a saw.  I am a little nervous so I am and going slow. 

I am hoping to post pictures soon. 
Cut the tree not the wood.

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #450 on: December 28, 2017, 10:25:37 AM »
Great thread.  I am currently porting my 365 x-torq.  This is the first time I have ported a saw.  I am a little nervous so I am and going slow. 

I am hoping to post pictures soon.
Looking forward to it.  I like how this thread keeps on rolling as more folks chime in with what they’re doing. 
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 SierraMtns

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Re: 372XP X-Torq Modding
« Reply #451 on: December 28, 2017, 08:47:43 PM »
Great thread.  I am currently porting my 365 x-torq.  This is the first time I have ported a saw.  I am a little nervous so I am and going slow. 

I am hoping to post pictures soon.
Looking forward to it.  I like how this thread keeps on rolling as more folks chime in with what they’re doing.

Yeah I was thinking about starting my own thread for this build but I think its cooler to join your thread and keep it going with the x-torq mods. 

I primarily cut soft wood (Pine, Doug Fir, and Cedar) out here.  On average the trees are 30" on the stump.   

The stock squish is 0.43" and compression is 155 psi.  This saw has 1.5 hours on it.  I was getting 9,500-9,800 rpm cutting a Digger Pine log.  The log was 29" and I am running a 32" bar with skip tooth and 50 ga chain.  I had to feather the saw in the cut because the chain would stop if I was really pulling on it.  My rakers might be a little low. 

I swung by our local machine shop today to see about cutting the base and sadly they don't have a jig to do that.  So it looks like I will either need to send it off or just do a base gasket delete. 


Will be posting pictures soon. 






Cut the tree not the wood.

Offline SierraMtns

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Re: 372XP X-Torq Modding
« Reply #452 on: December 30, 2017, 11:40:38 PM »
Ok guys here is where I am at.  I marked out the areas I will be grinding.  I will start on the lower transfers to get some practice.  I put the base gasket on and will port match the gasket to the transfers. 

What do you guys think?  See anything you would be concerned with?   I don't want to grind off to much. 





Cut the tree not the wood.

Offline SierraMtns

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Re: 372XP X-Torq Modding
« Reply #453 on: January 01, 2018, 09:13:30 PM »
I did some porting today to the intake and lower transfers.  I still need to get some stones to polish the ports. 

What tools do you guys use to polish the ports?  How smooth do they need to be?   

Thanks





Cut the tree not the wood.

Offline SierraMtns

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Re: 372XP X-Torq Modding
« Reply #454 on: January 01, 2018, 09:16:56 PM »

I am not sure if you guys can see the upper ports but I tried to make them come together and not have the air hit a wall. 

Cut the tree not the wood.

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #455 on: January 03, 2018, 01:02:11 PM »
Hard to tell in the pics but I think you need to take more material out of the lowers.  You’ve funneled them slightly but didn’t really widen the port overall.
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.

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Re: 372XP X-Torq Modding
« Reply #456 on: January 04, 2018, 12:36:41 AM »
Yeah I was thinking I needed to widen the lower transfers more too.  I was censored with the screws holding the transfer caps.  I marked out the area where I will widen them. 

Also I marked out the exhaust port to widen and transfers. 

What I am stuck on now is the transfers.  I can not figure out a way to mark them out 0.30 lower.  Do you guys have any tricks? 



Cut the tree not the wood.

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Re: 372XP X-Torq Modding
« Reply #457 on: January 04, 2018, 08:05:31 AM »
You’re right to be concerned about the cap screws but you’ve still got plenty of room.  Slow and steady and you’ll be fine.  The following video is how I find my height based on desired degree of opening.  Courtesy of mastermind.
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.

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Re: 372XP X-Torq Modding
« Reply #458 on: January 05, 2018, 10:36:18 PM »

I did more grinding today and polished the lower transfers and intake.  I went down to 180 grit and then a rubber polisher.  How smooth do you guys make? 





Man these lower transfers are hard to photograph. 

Cut the tree not the wood.

Offline XP_Slinger

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Re: 372XP X-Torq Modding
« Reply #459 on: January 06, 2018, 08:41:14 AM »
You actually want the intake and transfer passages to be textured not polished.  Texture creates surface turbulence that prevents fuel from falling out of suspension and sticking to the port wall.  Think of it like when you drive through thick fog and the moisture sticks to your windshield.  Same thing will happen with atomized fuel in your ports and cause fuel to puddle.   Someone chime in if I’m off on this but I understand it to be pretty standard practice.
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.


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