Recent content by stuh

Hi, I have a Stihl Ms 880 that id like to port to get a good work saw. Has anyone got some numbers they're willing to share? Thanks, Stu

Awesome, I'll see if I can get a port tool for transfers and have a crack at machining the base

So too long on transfers? More around 20° blowdown for a stronger saw? And if I machine the cylinder, would I go for a 20 thou squish

That sounds pretty cool. I've got to make a mandrel, then I can cut bases on my lathe. I've just been looking at my numbers for my OEM cylinder, intake is 79, exhaust 103, transfers 123 and blowdown is 20. I'm thinking of taking the intake to 81, exhaust to 99 making blowdown 24 and widening...

Ok thankyou, What websites would I find one on?

Squish is 40 thou. I can try it with a 36"

It's just a pipe that tees off with 2 outlets

I took the exhaust to 100 and widened, widened the intake but left it at 79 and opened up the lower transfers ( didn't touch the uppers) I made a stainless bearclaw style pipe and the saw runs good but not as much grunt as I hoped for when bar is buried. I tried it with a 24" bar. Blowdown is...

The brazing in the cylinder head, is that to increase compression?

I think the heat from welding could possibly distort the cylinder a bit

Is that because those Numbers are good?

As I'm pretty green to this, if I have 28* blow down, how will the saw perform with a 36" bar vs a 20* blowdown with the same bar?

Oh yes, I didn't consider that. I'll just do the cylinder. When it comes to widening the intake and exhaust, would the best way to measure how much I can go be to put bearing blue on the piston and gently scribe a line so I know how much to take off either side?

Just wondering, to save some grinding on the cylinder upper transfers, could I grind a bit off the top piston edges to make transfers open sooner?

Ok cool. If I take the transfers up to get a 20 blowdown will the longer duration matter?