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#Post#: 48856--------------------------------------------------
Sachs Dolmar 166 big bore
By: Uncle Lee Date: November 6, 2014, 7:11 am
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Not sure if this is in the correct forum. Kev you move it if you
wish.
This is a project i had been thinking about for awhile. I
previously sent a 166
cylinder to US Chrome to have it replated but they couldn't do
it do to a groove
that went right to the top. They said they could bore it over
size. So i sat on it
for over a year and then i purchased another 166 basket case.
Thought now
whould be a good time to think hard about using this damaged
cylinder. I did
some basic research with optional pistons and found the Stihl
084-088 piston
would be the easiest to make work and would be giving me a 4mm
overbore.
Bought an aftermarket piston from Randy. Now the work. The 184
has a taller
crown hight and 13mm pin. 166 has a 14mm pin. I found a local
small machine
shop that offset bored the pin hole the 14mm and .017 offset.
That lowered
the piston and put me where i wanted with plenty of squish. Next
move was
to add to the exhaust side piston skirt as when the piston was
at tdc it uncovered
the port. So i welded aprox 3mm to the piston skirt. Next i
assembled the saw
and ran it with a stock unmodded 166 muffler. She ran great and
is 8 seconds faster
than a identical 166 with same B+C. Both saws cut in the same
log on the same end.
Both saws matched as close as i could get and the big bore is 8
seconds faster.
But i still had a feeling there was more to get out of it. I
then realized i didn't do
anything to the intake skirt. It is closing the intake much
later than the stock 166 so
i took it appart and welded the intake side to match the 166. I
probably didn't have
to go that far and will take some off later. I also had a not so
nice muffler so i did the
double barrel muffler mod. Ran it in the same log again and
gained almost 4 seconds.
Thats almost 12 seconds over stock. Saw seems to pull like a
freight train. The next
step will be to advance timing a couple degrees and take maybe
1mm off the intake
skirt to give me a bit more duration.
Keep in mind guys i'm no porter at all and a complete rookie at
modding saws but this
one i'm very pleased with so far.
Uncle Lee
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston001_zps1e765991.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston001_zps1e765991.jpg[/img][/URL]
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston002_zps05a4e45d.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston002_zps05a4e45d.jpg[/img][/URL]
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston003_zpsa111e9b6.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston003_zpsa111e9b6.jpg[/img][/URL]
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston004_zps7e8989bb.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston004_zps7e8989bb.jpg[/img][/URL]
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston006_zps1e3a75c5.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston006_zps1e3a75c5.jpg[/img][/URL]
[URL=
HTML http://s234.photobucket.com/user/leeha1959/media/166with084piston007_zps44909ce5.jpg.html][img<br
/>width=600
height=450]
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston007_zps44909ce5.jpg[/img][/URL]
#Post#: 48857--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Uncle Lee Date: November 6, 2014, 7:14 am
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First video with stock muffler and untouched intake side skirt.
Uncle Lee
[URL=
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166with084piston001_zpsaaa1dbc0.mp4][IMG]http://i234.photobucket.com/albums/ee127/leeha1959/th_166with084piston001_zpsaaa1dbc0.mp4[/img][/URL]
#Post#: 48858--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Uncle Lee Date: November 6, 2014, 7:16 am
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Second video with welded intake skirt and modded muffler.
Uncle Lee
[URL=
HTML http://i234.photobucket.com/albums/ee127/leeha1959/166-084%202nd%20video%20001_zpsrvrzylrc.mp4][IMG]http://i234.photobucket.com/albums/ee127/leeha1959/166-084%202nd%20video%20001_zpsrvrzylrc.mp4[/img][/URL]
#Post#: 48859--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: aclarke Date: November 6, 2014, 7:52 am
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Very nice work!
#Post#: 48861--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Gatekeeper Date: November 6, 2014, 9:45 am
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Nice job as always Lee. I believe this fits in this area.
#Post#: 48862--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: 660magnum Date: November 6, 2014, 9:58 am
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Good job
#Post#: 48864--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Uncle Lee Date: November 6, 2014, 10:46 am
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Thanks Guys
Also forgot to mention that this was stock at 118cc's and now
with the 60mm bore it's at 136cc's. Quite a jump. Compression
is at 185 and not even broke in yet.
Lee
#Post#: 48866--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: 660magnum Date: November 6, 2014, 11:18 am
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The 166 has been awakened?
#Post#: 48867--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Chainsawrepair Date: November 6, 2014, 11:18 am
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I have liked your thinking on alot of these projects in the past
Lee. 8)
That 394 piston idea used for a stocker was cool info too. ;)
#Post#: 48868--------------------------------------------------
Re: Sachs Dolmar 166 big bore
By: Chainsawrepair Date: November 6, 2014, 11:20 am
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Here or the Dolmar board is perfect.
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