Author Topic: Sachs Dolmar 166 big bore  (Read 467 times)

0 Members and 0 Guests are viewing this topic.

Offline Eccentric

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2112
  • Karma: 217
  • Magnesium and Iron.
  • Location: Northwestern Wyoming
Re: Sachs Dolmar 166 big bore
« Reply #40 on: November 10, 2014, 03:08:40 pm »
I've found that a 395 piston runs really well in the 2100. 

Isn't the crown height way off?  IIRC, the jug has to be lowered quite a bit to get things in line.  I'd rather not cut that much from a good cylinder if possible...

Offline Eccentric

  • Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2112
  • Karma: 217
  • Magnesium and Iron.
  • Location: Northwestern Wyoming
Re: Sachs Dolmar 166 big bore
« Reply #41 on: November 10, 2014, 03:13:23 pm »
they have rings to run on chrome bore but they are not making any more of them so its old stock, same with the 60mm you can buy the ring to run on chrome bore , Wiseco doesnot make a ring to run on chrome bore in  the 52mm piston

What thickness are the rings?  Stock 1100-2101 Husky 'thick ring' pistons take 1.5mm 56mm rings.  Can't recall what the thickness of the later Husky 2101XP 'thin ring' piston rings are offhand.  For my purposes, I'd rather have a thick ring piston in my saw anyways.  I'm not racing the saw, and replacement rings are easier to get.  Cabers, or stock 394XP rings....

Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: Sachs Dolmar 166 big bore
« Reply #42 on: November 10, 2014, 03:35:50 pm »
Thin husky rings are below 1mm. (.8-.9) If I remember correctly

In regards to ring compatibility, are you guys referring to old school hard chrome bores with the porous **** looking appearance?   

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Sachs Dolmar 166 big bore
« Reply #43 on: November 10, 2014, 04:25:50 pm »
I used to do a lot of hard chroming back 33-40 yrs ago and I don't remember any of it looking like it had fish eyes or cracks?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Online srcarr52

  • 6 cube
  • ****
  • Posts: 288
  • Karma: 93
  • Location: IA
Re: Sachs Dolmar 166 big bore
« Reply #44 on: November 10, 2014, 04:55:34 pm »
I've found that a 395 piston runs really well in the 2100. 

Isn't the crown height way off?  IIRC, the jug has to be lowered quite a bit to get things in line.  I'd rather not cut that much from a good cylinder if possible...

You do have to cut some off the base to make it work but not enough to get concerned about the flange thickness.  I was still able to take 0.010" out of the squish and keep the intake timing below 157 deg duration.

For those of us who are already doing machine work it's a good option.


Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: Sachs Dolmar 166 big bore
« Reply #45 on: November 10, 2014, 05:43:10 pm »
All the hard chrome done on Lycoming and Continental, etc aircraft engines looks like it has a web of cracks in the surface. Good for lubrication.  That plating was done over the original steel bores.  May be a different process over the aluminum bores? 

Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Sachs Dolmar 166 big bore
« Reply #46 on: November 10, 2014, 05:59:56 pm »
I was doing draw bench internal mandrels that were 52100 steel.

To the bare eye they looked smooth as a baby's behind but I bet under even a 10 power eye piece, you could see cracks and holes?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline Playinwood

  • 6 cube
  • ****
  • Posts: 246
  • Karma: 5
Re: Sachs Dolmar 166 big bore
« Reply #47 on: November 10, 2014, 06:17:30 pm »
the only good 2100 were the single thin rings ;D

someone, somewhere, stated a fellow in Texas(?) was building thin rings, maybe you folks remember..

Offline EHP

  • Gas Hotsaw
  • ******
  • Posts: 598
  • Karma: 74
Re: Sachs Dolmar 166 big bore
« Reply #48 on: November 10, 2014, 06:45:58 pm »
Wiseco uses a thin ring and that is what there setup for when cutting the ring groove , a thick ring breaks when made to turn a real high rpm so that is why the thin ring . Same thing a single ring is way better than a double ring setup at high rpms , the ring lad will break between the 2 rings and that will spoil your day pretty fast . The chrome I'm taking about is what is in most of todays saw bores like the 3120 , 281, 372, 2100. You put a ring meant for say a cast iron bore and it will wipe out the bore in no time , Wiseco could have a ring for 56mm in chrome bore I just donot know but thought I asked and the answer was no

Offline Cut4fun .

  • Administrator
  • Nitro Hotsaw
  • *******
  • Posts: 22482
  • Karma: 585
  • OHIO REDNECK Saw Repair Getter Done
    • Redneck Chainsaw Repair
Re: Sachs Dolmar 166 big bore
« Reply #49 on: November 10, 2014, 06:59:41 pm »
Found the info on 166 rings



These 1mm rings are a cast ring,
And can be used in a chrome bore and
a nicasil bore. I can get chrome rings that
can be used in the nicasil bore but you can't
put a chrome ring in a chrome bore.


Lee
REDNECK Saw Repair Getter Done

 

Related Topics

  Subject / Started by Replies Last post
Sachs Dolmar 166

Started by Cut4fun « 1 2 ... 5 6 » Dolmar Makita

53 Replies
4994 Views
Last post June 18, 2021, 02:07:38 pm
by Bitburger
7 Replies
1526 Views
Last post January 02, 2012, 07:10:50 pm
by rms61moparman
21 Replies
2179 Views
Last post May 31, 2014, 10:52:19 am
by man of stihl
48 Replies
3640 Views
Last post February 12, 2020, 08:56:51 pm
by Cut4fun .
6 Replies
238 Views
Last post June 04, 2016, 11:25:00 pm
by farmboy
18 Replies
959 Views
Last post February 14, 2015, 08:40:38 am
by man of stihl
0 Replies
71 Views
Last post August 10, 2015, 02:17:30 pm
by stihls066
12 Replies
2199 Views
Last post June 25, 2017, 10:13:52 am
by Cut4fun .
2 Replies
622 Views
Last post January 27, 2017, 06:51:49 pm
by 166
1 Replies
518 Views
Last post January 28, 2017, 03:23:23 pm
by 660magnum