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#Post#: 5776--------------------------------------------------
039 power tips for build off
DIR By: rms61moparman
Date: December 22, 2011, 5:26 pm
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Who has any "go fast" tips for the 039?
This one I'm building runs good but loses power in the cut.
Mike
#Post#: 5778--------------------------------------------------
Re: 039 power tips for build off
DIR By: Cut4fun
Date: December 22, 2011, 5:33 pm
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Mike as you know the 290 310 390 will gain about 20% after a
simple 30min muffler mod and carb retune.
oops I just noticed it said for build off. Better go with welded
up pop up then and have Nik machine it up for you. My bad I
didnt read that before. I was just think a mild work saw.
HTML http://chainsawrepair.createaforum.com/stihl/stihl-ms390/
You could always do basic woods port or do a weld up pop up. No
sense in all of that though. JMO.
#Post#: 5781--------------------------------------------------
Re: 039 power tips for build off
DIR By: rms61moparman
Date: December 22, 2011, 5:44 pm
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I've opened up the exhaust a bit and modded the muff.
Don't know if the muff mod went far enough.
I've got a pop-up piston coming from a good friend, hopefully it
will be here tomorrow.
What can you tell me about the transfers on these saws?
I guess that is the next step. They are the flat top type, will
they benefit from angling them up a few degrees?
Mike
#Post#: 5782--------------------------------------------------
Re: 039 power tips for build off
DIR By: Cut4fun
Date: December 22, 2011, 5:49 pm
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To be honest I never paid attention inside one on transfers when
inside. I despise the whole series of these saws 170-390 to be
truthful.
That stumpbroke guy has been deep into them. But I think he is
the one having the build off. So he might not share much right
now.
Here is a new site started up CompetitionSaws and run like this
site without all the BS ;). More of a porters site too.
HTML http://competitionsaws.createaforum.com/index.php
#Post#: 5814--------------------------------------------------
Re: 039 power tips for build off
DIR By: Al Smith
Date: December 23, 2011, 5:00 pm
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I've got part of a box full of parts from a couple 029 and 039
that couldn't cut the mustard for a tree service crew . The boys
killed em dead as a door nail never to run again .I could look
at the porting but quite honestly I don't think you can do a lot
to them being a clam shell design .
#Post#: 5819--------------------------------------------------
Re: 039 power tips for build off
DIR By: rms61moparman
Date: December 24, 2011, 12:12 am
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I guess, the weather permitting, we will find out tomorrow.
I put a custom piston in it today and I think it'll run pretty
good.
I'm certainly no saw builder but I just hope to not finish in
last place in this buildoff.
Al,
I might be interested in some of those parts.
Mike
#Post#: 5820--------------------------------------------------
Re: 039 power tips for build off
DIR By: Al Smith
Date: December 24, 2011, 4:34 am
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It's a story but technically the parts aren't mine .
I kind of adopted this tree service guy who is kind of my wifes
adopted son .Not legally but she changed his diaper when he was
a baby .
I service a lot of his equipment and store some of his saws
because where he lives he has experiaced a lot of theft .
So much for that now the 029's and 039's .For what they were
built for they do just fine which is a consumer fire wood saw
.In service for a tree company ran by people who don't own the
saws they just can't take the abuse .Those guys beat the tar out
of them .
Eventually all those dead and wounded saws make it to my shed .I
either get them running if I feel like it or just toss the parts
in a box .So much for that .
#Post#: 6023--------------------------------------------------
Re: 039 power tips for build off
DIR By: rms61moparman
Date: December 27, 2011, 11:03 pm
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Well the 039 runs real good with a HUGE popup piston but is
still only making around 150# of compression.
I took some measurements and the saw doesn't have any squish!
Instead has more of a gentle squeeze...LOL
The best measurement around the squish band is .050 and they go
up from there to about .053.
I am looking at the piston from a TS400 concrete saw, does
anyone know if it is any taller from the pin to the crown???
Any other suggestions?
I don't think I will gain anything with a bigger pop-up. This
one is .160 tall and a work of art.
Mike
#Post#: 6024--------------------------------------------------
Re: 039 power tips for build off
DIR By: Al Smith
Date: December 28, 2011, 2:42 am
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Did you cut a raised dome in the piston or weld one up and then
turn it down?
If you cut one in it will actually lower the compression unless
it's on an engine design where the base can be cut down .Not so
on an 039 because it's a clam shell design .
I'm confused .With 160 thou raised dome it's obviously cut in
which in effect would raise the exhaust by that much which
would be huge . In my way of thinking that high of an exhaust
port opening would be upwards of 80-82 degrees opening and would
kill the torque on that thing .It would or should wind up but
won't have any grunt .--Am I missing something in the
description ?
#Post#: 6030--------------------------------------------------
Re: 039 power tips for build off
DIR By: Cut4fun
Date: December 28, 2011, 11:34 am
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Mike did your piston start with a welded center then cut pop up
out of it?
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