Author Topic: Sachs Dolmar 166 big bore  (Read 1970 times)

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Offline Eccentric

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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

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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

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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

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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?
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Offline srcarr52

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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

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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

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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?
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Offline Playinwood

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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

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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 .

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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

 

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