What's on your bench?

[drf256]

The @MustangMike MS360

Oem jug ported, muff modded. Awaits timing advance, assembly, frogskins, a bath, and new badges.

 

[drf256]

I don't take the ports to the limit anymore. Rounder corners and more space between the skirt and port edge results in a saw that is a few percentage points slower but many percentage points longer lasting IMHO.

I'm at .019 squish. Likely sand a bit more out. I shoot for 22 these days.

 

[rattler]

Some purty grinding AL looks great.

Sent from my SM-G935V using Tapatalk

 

[drf256]

Thanks Mike

 

[T.Roller]

I'm about to pull the trigger and buy some porting tools.

 

[rattler]

Thanks Mike

You very Welcome my Freind.

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[Sty57]

I know this is a very basic question.

But how do you determine how wide to go on an intake / exhaust port?

 

[drf256]

I know this is a very basic question.

But how do you determine how wide to go on an intake / exhaust port?

Max width ROT is 65% bore for a worksaw and 70 race. Of course there are opinions and variations on that Brian.

On most Stihl models I do, the piston skirt is narrower than 65% so there is no getting close to it.

Then you can widen to 1mm from skirt edge where there are no ring pins and like 2.5mm where there are.

The rounder and smaller the port, the easier it is on the rings and piston skirts.

Piston design plays a role too. As in full circle vs. windowed, etc...

Again, some people will not agree with above, but it's what I do.

 

[Sty57]

Max width ROT is 65% bore for a worksaw and 70 race. Of course there are opinions and variations on that Brian.

On most Stihl models I do, the piston skirt is narrower than 65% so there is no getting close to it.

Then you can widen to 1mm from skirt edge where there are no ring pins and like 2.5mm where there are.

The rounder and smaller the port, the easier it is on the rings and piston skirts.

Again, some people will not agree with above, but it's what I do.

Thanks Al
I'm going to try laying them out today.

 

[paragonbuilder]

Good thing you caught it. I've been there taking something apart multiple times and scratching your head. Did you catch it in time?

Yeah. It would run great but the idle was inconsistent. I knew something was up. It only has a couple tanks on it since I ported it. It's my Bil's saw.

 

[Onan18]

I don't take the ports to the limit anymore. Rounder corners and more space between the skirt and port edge results in a saw that is a few percentage points slower but many percentage points longer lasting IMHO.

I'm at .019 squish. Likely sand a bit more out. I shoot for 22 these days.

View attachment 51194 View attachment 51195 View attachment 51196 View attachment 51197 View attachment 51198

Beautiful work as always Doc, that is going to be one fine running saw.

Joe

 

[Onan18]

Time to put the extra leaf on the kitchen table.View attachment 51160

Do I spy a SP125 in the mix there Jim?

 

[Moparmyway]

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Nice deflector job Al !!
Stihls with the Red97 deflectors look awesome !!

 

[Moparmyway]

Got a little more play time

 

[paragonbuilder]

I don't take the ports to the limit anymore. Rounder corners and more space between the skirt and port edge results in a saw that is a few percentage points slower but many percentage points longer lasting IMHO.

I'm at .019 squish. Likely sand a bit more out. I shoot for 22 these days.

View attachment 51194 View attachment 51195 View attachment 51196 View attachment 51197 View attachment 51198

Looks good Al!
Fuel usage less with the intake like that?

 

[paragonbuilder]

Got a little more play timeView attachment 51210View attachment 51211

Whatcha got there Kev?

Finally got a bar to run the 36" sq filed .404 you left me last spring. Cuts awesome!!

 

[Moparmyway]

Whatcha got there Kev?!

New 346 P&C Dan, gotta have something respectable for 50cc's incase I can get to your place !!

 

[paragonbuilder]

New 346 P&C Dan, gotta have something respectable for 50cc's incase I can get to your place !!

Ah...
Going for a cant cutter, or work saw?
Nice pop up!

 

[big t double]

Did they run?

Hell I dunno...I'm just happy to get them together without a bunch of extra parts layin around. It's just a bonus if they actually run.

 

[Moparmyway]

Ah...
Going for a cant cutter, or work saw?
Nice pop up!

I'm playing around with it