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Author Topic: porting an 044  (Read 3838 times)

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Offline charleswalton

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porting an 044
« on: January 10, 2014, 10:35:52 PM »
Can anyone tell me how to woods port an 044,like how much to raise the exaust,lower the intake etc.

Offline charleswalton

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Re: porting an 044
« Reply #1 on: January 14, 2014, 08:35:22 PM »
Did I say something wrong?No one seems to have any advise on this topic.

Offline AdkStihl

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Re: porting an 044
« Reply #2 on: January 15, 2014, 08:33:18 AM »
Have you ever ported a saw cylinder before?
Just asking because if not, I would choose something a little cheaper to "practice" your porting skillz.
Most saw builders don't have to ask about duration #'s

Is it an older 10mm saw or a newer 12mm saw?
J.Miller Photography

Offline AdkStihl

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Re: porting an 044
« Reply #3 on: January 15, 2014, 08:53:53 AM »
Here are some good #'s to aim for in a newer 12mm saw.

Exhaust 103, or 14 of blowdown.
Intake  82, or 164 duration

I'm not a saw builder, nor do I claim to be.
The above numbers were posted by a reputable saw builder on another forum.
J.Miller Photography

Offline charleswalton

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Re: porting an 044
« Reply #4 on: January 15, 2014, 09:11:54 AM »
You are probably right,that seems a little over my head,I ported a motorcycle I had one time with the instructions from DirtBike magazine but it was very straight forward and simple,I raised the exhaust about 1mm and just cleaned up all the rest.It turned out good but may have been just luck.If anyone has any simple instructions like that for a saw I would appreciate it.

Offline AdkStihl

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Re: porting an 044
« Reply #5 on: January 15, 2014, 09:41:21 AM »
You are probably right,that seems a little over my head,I ported a motorcycle I had one time with the instructions from DirtBike magazine but it was very straight forward and simple,I raised the exhaust about 1mm and just cleaned up all the rest.It turned out good but may have been just luck.If anyone has any simple instructions like that for a saw I would appreciate it.

Nothing simple about it. If you don't have the proper tooling, don't attempt it. Especially on a saw that cost over $900 to replace.
Have you visited the "other" forums yet?
A lot more saw building and porting goes on over at them places.
I would head over there and do at least a month of Sundays worth of reading before taking a grinder to an 044/440.

By raising the exhaust, you gain RPM but sacrifice torque.

Why not just do a muffler mod? There's a lot of performance to be had simply by opening up the muffler a bit.

I'm not saying "don't port your saw", what I am saying is be aware of the cost if things don't go right.



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Offline charleswalton

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Re: porting an 044
« Reply #6 on: January 15, 2014, 11:10:14 AM »
That sounds like good advise,I'll try the muffler mod first.Thanks.Does anyone know of a shop in my area that does porting,I'm in Dallas Ga.

Offline sharkey

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Re: porting an 044
« Reply #7 on: January 15, 2014, 01:10:00 PM »
Charles, can you come up with a degree wheel?  Also, do you have access to a lathe? 


Offline AdkStihl

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Re: porting an 044
« Reply #8 on: January 15, 2014, 01:15:49 PM »
That sounds like good advise,I'll try the muffler mod first.Thanks.Does anyone know of a shop in my area that does porting,I'm in Dallas Ga.

I know a few in Tennessee.
One of them is a member here.

TLandrum
Terry Landrum
Wicked Work Saw
http://wickedworksaw.com/
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Offline AdkStihl

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Re: porting an 044
« Reply #9 on: January 15, 2014, 01:17:48 PM »
If you want bolt-on performance you can buy an 046/460 dual port muffler cover for under $20.

http://northwoodsaw.com/store/index.php?l=product_detail&p=1982
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Offline JohnG28

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Re: porting an 044
« Reply #10 on: January 15, 2014, 03:42:13 PM »
I haven't done any of this before myself but am getting into a Husky 350 I got cheap as something to play with. As ADK said, might not be worth messing with a really good saw. If you did do anything, you could polish the ports, just removing any burs thst would make airflow turbulent. You could also slightly widen the ports with lowering or raising, this eliminates changing timing. Long as you go easy should be ok I think. This is my plan. Good luck.
Stihl MS361, 460 & 200T, Jonsered 490, Jonsereds 90, Husky 350 & 142, Homelite XL and Super XL

Offline HolmenTree

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Re: porting an 044
« Reply #11 on: January 15, 2014, 03:55:21 PM »
The best simple power increase mod you can make to your 044 is open up your muffler by adding a second exhaust outlet or enlarge the original one.
Then remove the cylinder base gasket, clean up both the surfaces where the gasket contacted, spread a very thin coating of YamaBond sealant or similar stuff on the cylinder base, let dry until tacky and then wet the crankcase surface with some grease. The grease prevents the cylinder from gluing solid to the crankcase for future removal.
 Bolt everything back together , richen the carb and your good to go.
Making a living with a saw since age 16.

Offline Andyshine77

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Re: porting an 044
« Reply #12 on: January 15, 2014, 04:16:40 PM »
You can't simply remove the base gasket without checking for squish clearance. In a 044 you'd want no less than .018" of clearance. 
Andre.

Offline AdkStihl

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Re: porting an 044
« Reply #13 on: January 15, 2014, 04:36:10 PM »
You can't simply remove the base gasket without checking for squish clearance. In a 044 you'd want no less than .018" of clearance.

My thoughts too.
When I rebuilt my 044 last winter there was no way I could run gasket-less without running a milled pop-up.
With a gasket....IIRC....I measured 0.032"+/-
Gaskets run about 0.020"+/-
J.Miller Photography

Offline Al_Smith

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Re: porting an 044
« Reply #14 on: January 15, 2014, 08:34:40 PM »
You'd be better off to just doing some alterations to the muffler than fiddling around trying to make a cookie cutter .Just a simple muffler modification will work wonders and may satisfy you .

Do some on line research such as a site called MacDizzy,Gorden Jennings two stroke tuner ,RC sites ,British motorcycle sites etc .Quite frankly almost no chainsaw site will you get much indepth information. You'll just get 500 opinions and everyone will be right --or so they say . ;)

Offline HolmenTree

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Re: porting an 044
« Reply #15 on: January 15, 2014, 10:58:34 PM »
You can't simply remove the base gasket without checking for squish clearance. In a 044 you'd want no less than .018" of clearance.
Worked fine on on my 044, brought the compression up real nice with no problems. ???
The thin layer of Yamabond still left enough safety clearance.
Making a living with a saw since age 16.

Offline Andyshine77

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Re: porting an 044
« Reply #16 on: January 15, 2014, 11:27:51 PM »
You can't simply remove the base gasket without checking for squish clearance. In a 044 you'd want no less than .018" of clearance.
Worked fine on on my 044, brought the compression up real nice with no problems. ???
The thin layer of Yamabond still left enough safety clearance.

Manufacturing variances. Pull the gasket without measuring squish, and the piston could hit the squish band. I've seen stock saws with .016" of clearance, most gaskets are around .020"  You have to take measurements and degree the cylinder before you can ever dream of properly porting a saw or any other engine.

When you up compression you can normally play with exhaust numbers a little more.   
Andre.

Offline HolmenTree

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Re: porting an 044
« Reply #17 on: January 16, 2014, 06:29:23 AM »
If my memory serves me correct the newer Stihl 440 have  less clearance.
Seeing the OP has a 044 I gave my experiences with the older series.  I know the gaskets are approximately .020" and with my 034, 038, 044, 064, 090 they were all good to go without it.

Like I said easiest mod is to raise the compression and open up the muffler exhaust outlet a little.
Making a living with a saw since age 16.

Offline Al_Smith

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Re: porting an 044
« Reply #18 on: January 16, 2014, 06:50:51 AM »
About the only stock clearance piston face to head deck I have commited to memory is the 038 series which is 46 thou .

Exactly why after that series the clearance went to around 35 thou I have no idea .Perhaps the actual hemispherical combustion chamber was larger .It certainly didn't raise the compression much if any .

You've got options here .Of course were it I ,I would cut the cylinder base but not everybody has a lathe .You can adjust it with the gasket thickness .The cover of National Geographic or any relatively stout paper will suffice .

Offline AdkStihl

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Re: porting an 044
« Reply #19 on: January 16, 2014, 09:50:18 AM »
About the only stock clearance piston face to head deck I have commited to memory is the 038 series which is 46 thou .

Rebuilding an 038 Super right now actually. I would say that your memory is *DanG good Uncle Al.
Without the base gasket (0.020"), squish measured 0.0275".
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