porting 359husky

[old guy]

anybody got some numbers please, thanks .

 

[davidwyby]

If @Benwa would come around …

 

[Jusgunn3]

I know @farminkarman has done a few.

 

[old guy]

Wal, I went & did er up. I put this together a couple of years ago, a 359 top on a 357 case & crank, base gasket delete, aftermarket muff with a 15/16 outlet.
Checking the No's I got ex 105, trans 118, in77, squish .022.
I decided to go with that.
I widened the intake 1/8 on each side, the exhaust not quite that much.
I had allready matched the lower transfers, oh, this wearing a 372 carb also.
After a few cuts comp is at 160. My, my, my, those rakers have gotta come down.

 

[Benwa]

Wal, I went & did er up. I put this together a couple of years ago, a 359 top on a 357 case & crank, base gasket delete, aftermarket muff with a 15/16 outlet.
Checking the No's I got ex 105, trans 118, in77, squish .022.
I decided to go with that.
I widened the intake 1/8 on each side, the exhaust not quite that much.
I had allready matched the lower transfers, oh, this wearing a 372 carb also.
After a few cuts comp is at 160. My, my, my, those rakers have gotta come down.

@davidwyby Typical me, day late and dollar short. The 357 Top end I did for yours ended up at
Intake 77°
Exhaust 103°
Transfers 121°

@old guy sounds to me like you're on track. They're such great saws. Underrated in my opinion. Especially once they're punched up a bit.

On these saws I like intake at 77-78° I have a personal 359 set at 80° without issue
I set my exhaust at 101-103° most like the 105° range from what I've read.
Squish set at .018 - .020
I feel they like less blowdown than some others, I set mine at 16°-18°
I widen both intake and exhaust ports to 65% of bore as well as stretching the upper transfers towards the intake side a touch. I open up the lowers too, but I don't go crazy. I also open up and narrow up the divider in the transfer covers. They really take to a slight bump in ignition timing too. Right around 28° btdc.

 

[old guy]

Yeah, I did the ignition too I moved it one fin on the flywheel.
I was amazed at the torque, chain was pretty good, 20'' bar in 12'' white oak and I had to pull pretty hard to slow it down.
Funny thing, it sat in the pole shed for probably 18 months and when I pulled the muffler it was filled with acorns, gonna have to put a plug in that big hole.

Ya know, I have another one of these, hmmm!

 

[pbillyi69]

what numbers do y'all use on the 357?

 

[Kiwioilboiler]

what numbers do y'all use on the 357?

I use 1 to 4 so far.
#1 is an XS.
#2 is tidied and twin port muffed.
#3 is re-cranked 'narrow rod'.
#4 is a runs already.

 

[Motorka]

timing advanced on this ?

 

[old guy]

I have been using this saw for a couple of days now in red oak, 20'' bar, new dukes chain, it is an animal.
My stock 372 has gone into hideing.
Thanks for all the input Guys, couldn't have done it without Ya.

 

[old guy]

Well, I dragged that 372 out of hiding and followed Treemoncky's video.
When it came to doing the upper transfers with a dremel I could see it going bad quickly, so now there is two new tool names in the shop, Foredom & luckydog.
I can only hope I get as much out of the 372 as came out of the 359, I laugh out loud every time I run that saw.

 

[old guy]

Well, I dragged that 372 out of hiding and followed Treemoncky's video.
When it came to doing the upper transfers with a dremel I could see it going bad quickly, so now there is two new tool names in the shop, Foredom & luckydog.
I can only hope I get as much out of the 372 as came out of the 359, I laugh out loud every time I run that saw.

It looks like I have my first ruined cyl. under my belt, apparently the degree wheel must have moved.
Today I ground the transfers to the marks for 122 degrees, before I smoothed them up I decided to put the wheel on for a last check, it showed I was already down to 114 degrees.
It was an old cyl., one of the rings had a .060 gap, the other must have been replaced cuz it was rite tight. All is not lost, there's two new oem p&c on the shelf.

 

[EFSM]

If you’d cut the base and squish a bunch you might still be able to make that work.

 

[Sloughfoot]

It looks like I have my first ruined cyl. under my belt, apparently the degree wheel must have moved.
Today I ground the transfers to the marks for 122 degrees, before I smoothed them up I decided to put the wheel on for a last check, it showed I was already down to 114 degrees.
It was an old cyl., one of the rings had a .060 gap, the other must have been replaced cuz it was rite tight. All is not lost, there's two new oem p&c on the shelf.

What's 114 put blowdown at?

 

[old guy]

If you’d cut the base and squish a bunch you might still be able to make that work.

If I had a lathe, I'll keep it on the shelf with that in mind.

 

[old guy]

What's 114 put blowdown at?

12 degrees.

 

[Sloughfoot]

12 degrees.

You considered raising the exhaust roof 4 degrees? Torque may be peaky but it'd be fast. 16 blowdown is a bit small and 98 exhaust a bit high but nothing too ridiculous.

 

[old guy]

You considered raising the exhaust roof 4 degrees? Torque may be peaky but it'd be fast. 16 blowdown is a bit small and 98 exhaust a bit high but nothing too ridiculous.

There's an idea I can play with, I'll have to study on that tomorrow, thanks.