Stihl 261C porting

[Stirlinghart]

I’ve been experimenting a lot with the Stihll 261c. Trying to get a bit more low-end torque and for running a longer bar. I end up with a lot of falling and processing jobs on second growth timber In the small saws are great.

Anyone had some success with these kinds of builds and wants to banter a little bit about strategies and timing numbers?


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[Mastermind]

MS261

Stock:

Compression: 150psi
Ex: 105°
Tr: 121-135°
In: 74°

Ported:

Compression: 210psi
Squish: .020
Ex: 105° = .915” From squish band Width = 1.100”
Tr: 125° = 1.080” From squish band
In: 80°

Notes:

I cut .030” from the squish, and .045” from the base.

32mm Stroke

 

[Stirlinghart]

MS261

Stock:

Compression: 150psi
Ex: 105°
Tr: 121-135°
In: 74°

Ported:

Compression: 210psi
Squish: .020
Ex: 105° = .915” From squish band Width = 1.100”
Tr: 125° = 1.080” From squish band
In: 80°

Notes:

I cut .030” from the squish, and .045” from the base.

32mm Stroke

I had expected to have to coax that out of people a little bit more. Appreciate it!


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[Mastermind]

I had expected to have to coax that out of people a little bit more. Appreciate it!


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No problem. I've done a bunch of these with this "recipe". Makes great torque.