DOLMAR/MAKITA The Official Sachs Dolmar Dolmar Makita Dolmar Chainsaws Thread

[Simondo]

Thanks
And the twin ring threw me off to.
But if it works I'll run it.

I have checked and found that the 115 (closed port) has the 2 ring windowed piston... 111 has the single ring open port cylinder and non windowed piston. Both are 44mm cylinders . Here are some pics of a 111 cylinder and piston for you to compare . All dimensions are imperial as i assume thats your preference. The 115 is not striped down for a side by side comparison .

 

[old_sir_henry]

I have checked and found that the 115 (closed port) has the 2 ring windowed piston... 111 has the single ring open port cylinder and non windowed piston. Both are 44mm cylinders

IMHO the number of piston rings doesn't matter. Dolmar has built one and two ringed pistons into the 115 and 110.
What makes a difference is windowed vs. non-windowed pistons, the former don't work well with open transfer ports, the latter
are better suited for open transfers.
However, I have had a 112 with open transfers and windowed pistons, many combinations work but maybe not as optimal as could be.

 

[Simondo]

IMHO the number of piston rings doesn't matter. Dolmar has built one and two ringed pistons into the 115 and 110.
What makes a difference is windowed vs. non-windowed pistons, the former don't work well with open transfer ports, the latter
are better suited for open transfers.
However, I have had a 112 with open transfers and windowed pistons, many combinations work but maybe not as optimal as could be.

One of a few concern I had with the 1 or 2 ring situation was where the ring ends came when putting a different piston design in a cylinder than was factory spec.... May or may not be a issue.
The dimensions of the piston and what it covers or doesn't cover within the stroke may just end up being to different along with the window V non window situation also a possible further negative.
At least the 111 and 115 have the same diameter and stroke so hopefully the dimensions i posted will give some assistance.
As a side note....Interestingly Dolmar are using a slab sided non windowed piston in some of the closed port saws now rather than the windowed sort.

 

[NCFarmboy]

No I didn't. Reused old piston w/new Caber on it and called it good. Now have a $30.00 piston sitting in piston drawers w/109 more.
Shep

Want to think mine is OP cyl but like I said it's been a while 2-3 yrs.

 

[Dub11]

IMHO the number of piston rings doesn't matter. Dolmar has built one and two ringed pistons into the 115 and 110.
What makes a difference is windowed vs. non-windowed pistons, the former don't work well with open transfer ports, the latter
are better suited for open transfers.
However, I have had a 112 with open transfers and windowed pistons, many combinations work but maybe not as optimal as could be.

it's a CP head.

One of a few concern I had with the 1 or 2 ring situation was where the ring ends came when putting a different piston design in a cylinder than was factory spec.... May or may not be a issue.
The dimensions of the piston and what it covers or doesn't cover within the stroke may just end up being to different along with the window V non window situation also a possible further negative.
At least the 111 and 115 have the same diameter and stroke so hopefully the dimensions i posted will give some assistance.
As a side note....Interestingly Dolmar are using a slab sided non windowed piston in some of the closed port saws now rather than the windowed sort.

Aren't them new Dolmars using the slab side pistons bottom feed ports?

 

[NCFarmboy]

Yep! 5100-5105 and 7900( changed in production run)-7910. Don't know about the other models.
Shep
That piston may work in the CP model. PM me I'll send you mine. If it works you can pay me for it.

 

[Dub11]

Yep! 5100-5105 and 7900( changed in production run)-7910. Don't know about the other models.
Shep
That piston may work in the CP model. PM me I'll send you mine. If it works you can pay me for it.

Right on PM sent.

 

[Dub11]

I have checked and found that the 115 (closed port) has the 2 ring windowed piston... 111 has the single ring open port cylinder and non windowed piston. Both are 44mm cylinders . Here are some pics of a 111 cylinder and piston for you to compare . All dimensions are imperial as i assume thats your preference. The 115 is not striped down for a side by side comparison .

So I measured my window piston and it was the same as you or measurements.

And feel free to use metric. We use it at work and that's what these saws a set up with.

 

[Simondo]

So I measured my window piston and it was the same as you or measurements.

And feel free to use metric. We use it at work and that's what these saws a set up with.

Good...You have options then along with NCfarmboys offer .
I do use imp and metric depending .... Miles ,feet and inches but the small stuff I tend to use mm only .
I think of the US as mostly a Imp user so I try to offer what folks may be comfortable with.

 

[old_sir_henry]

At least the 111 and 115 have the same diameter and stroke so hopefully the dimensions i posted will give some assistance.

Dolmar parts lists show the same piston for both 111 and 115, so they are interchangeable, regardless of the number
of piston rings.

 

[old_sir_henry]

New arrival today:



Don't know if it will run but the body is very well preserved.

 

[ajschainsaws]

New arrival today:

View attachment 157900 View attachment 157901 View attachment 157902

Don't know if it will run but the body is very well preserved.

It is never ran one seen a few for sale it’ll be good too see it going

 

[Dub11]

Good...You have options then along with NCfarmboys offer .
I do use imp and metric depending .... Miles ,feet and inches but the small stuff I tend to use mm only .
I think of the US as mostly a Imp user so I try to offer what folks may be comfortable with.

Think of it this way General Motors has been using metric bolts since the late 70s

We've gotten use to it.

 

[dahmer]

Think of it this way General Motors has been using metric bolts since the late 70s

We've gotten use to it.

What’s this we crap?!?!

 

[Dub11]

What’s this we crap?!?!

Do you own metric wrenches?

 

[dahmer]

Do you own metric wrenches?

Now it makes sense! Couldn’t figure out why they had weird sizes like 1/3 and 1/5, I guess it’s 13mm and 15mm. Guess I better dig all the weird sizes out of the trash can.

 

[Fishnuts2]

New arrival today:

View attachment 157900 View attachment 157901 View attachment 157902

Don't know if it will run but the body is very well preserved.

Is there any way to see whether my 118 is a Super without measuring the bore? I've noticed some have decals on the recoil stating 118 Super, while others are unlabeled.

 

[old_sir_henry]

If you want to be sure: metering the bore is the way to go, the decals may have gone lost...

 

[Fishnuts2]

I had the same thoughts on the decals too.
Would the serial number reflect which model it was?


Sent from my iPhone using Tapatalk

 

[OldJack]

Think of it this way General Motors has been using metric bolts since the late 70s

We've gotten use to it.

Not everyone has got used to Trudeau Math.