I ported my 359 quite a few years ago and probably went to some lengths that you don't want to do, but the results are really great. Quite a powerful saw for the displacement. The number I used were exhaust O-95.0, C-93.0, duration-172deg. Transfers O-109.5 ATDC, C-107.3 BTDC, duration-143.2deg. Intake 0-75.5 BTDC, C-75.0 ATDC, duration-149.5deg. I milled the cylinder base after removing the gasket (squish at .020), results were from milling the piston as well. I really wanted that tight squish. I also lightened the piston. Muffler mod for sure. Your results look real good after seeing the video cutting wood. I generally run a 24" bar.
Thanks for the reply. I opened up the transfers similar to yours, but I did not cut away any of the base when doing it as you did, or at least very minimally and unintentionally where the cutting burr nipped there a tiny bit. Did a smooth cut away fading up to the base. Did you run a compression check after finishing, just curious what you might have come up with, say compared to a mod with a tighter squish. All my modded saws I shoot for .020" and sometimes end up slightly under. Some are heavy users (tree removal work) and so far no burned up yet. The only damage so far with any of them is that the 359 suffered a broken or simply came out circlip, which put a deep perfectly incised scar going up the cylinder wall to near the combustion chamber. God knows what happened to that clip piece of metal after that. I thought all was lost, but managed to repair it. Some eardrum damage too, that from a Stihl though.
No I didn’t check the compression after, but I definitely have to use the decompression valve to pull it over. Now you have me curious, I’m going to do that. I’ll let you know where it’s at. By now it has at least a dozen hrs since the build. Thanks for checking out my videos!
Love my 359 for smaller jobs(max 24” skip tooth). Ported 372 for big wood(36” skip tooth). Just assembling my 359 with 47 mm Hyway top end. 30 squish, exhaust105, trans 124, intake 73/73. All new bearings, seals. Like new…..well see….
Nice video, never ported a saw, however I am very interested in learning about this. I have to read up on this topic to better understand . Perhaps in the future you could share your experience and thoughts about porting, like a mini tutorial? I hope your shoulder is feeling better. Thanks for sharing Stay safe
Thank you. I'm still new to porting myself. I've been sharing my experiences as I learn. I was thinking of doing a cylinder cutaway on an old saw to help in my explanations and theories. I feel it may help me wrap my head around it better.
First off I’m by far no expert and have never done a 359 but I do have one that someone else ported and it’s mean. I have Ported a few saws tho. I like the work you did on the lowers. From what I can see it looks pretty damn good. As far as Intake I wouldn’t move it any more, I think you’re base gasket delete gave it great numbers. You could move the exhaust back to 100 but I wouldn’t go past 100. I would prolly just keep it at 102 to give you some more bottom end power in a smaller saw. Then if you want you could change it later. I’d say it’s a runner and nice work
Also put your intake boot on and aligned correctly and mark a scribe line if there is a lip where it transitions to the jug. Take that down till it’s a nice smooth transition with no lip if that makes sense
Thanks! I was thinking the same so I started reassembling it last night, I can always go back in but I want to try it the way it is! Thanks for the advice!
I would personally go for the 100 exhaust with 24 degrees BD. Don’t go for a 28” bar on this one. Can it do it…. Yeah it can but you’re gonna run a 24” much better. You’re lower transfer work looks good to me. Check out a guy named the ironhorse. He does his transfers that way. He also likes 153-155 duration of intake. 22-25 of BD. He actually goes to 98 or 96 exhaust on a 372. If this was my 359 I would go 100 or 99.
I have a few videos of the saw after I finished, I haven’t tried it with a 24” yet but it pulls a 28” pretty good! I’m happy with it so far. Thanks for the info and suggestions! Maybe I’ll build another one!
Thanks for the reply, even late its appreciated! I’m still so impressed with how it cam out I have another 359 I want to repeat what I did, just to see how close I can get it.
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I ported my 359 quite a few years ago and probably went to some lengths that you don't want to do, but the results are really great. Quite a powerful saw for the displacement. The number I used were exhaust O-95.0, C-93.0, duration-172deg. Transfers O-109.5 ATDC, C-107.3 BTDC, duration-143.2deg. Intake 0-75.5 BTDC, C-75.0 ATDC, duration-149.5deg. I milled the cylinder base after removing the gasket (squish at .020), results were from milling the piston as well. I really wanted that tight squish. I also lightened the piston. Muffler mod for sure. Your results look real good after seeing the video cutting wood. I generally run a 24" bar.
Did you open the lower transfers like I did?
Thanks for the reply. I opened up the transfers similar to yours, but I did not cut away any of the base when doing it as you did, or at least very minimally and unintentionally where the cutting burr nipped there a tiny bit. Did a smooth cut away fading up to the base. Did you run a compression check after finishing, just curious what you might have come up with, say compared to a mod with a tighter squish. All my modded saws I shoot for .020" and sometimes end up slightly under. Some are heavy users (tree removal work) and so far no burned up yet. The only damage so far with any of them is that the 359 suffered a broken or simply came out circlip, which put a deep perfectly incised scar going up the cylinder wall to near the combustion chamber. God knows what happened to that clip piece of metal after that. I thought all was lost, but managed to repair it. Some eardrum damage too, that from a Stihl though.
No I didn’t check the compression after, but I definitely have to use the decompression valve to pull it over. Now you have me curious, I’m going to do that. I’ll let you know where it’s at. By now it has at least a dozen hrs since the build. Thanks for checking out my videos!
102 exhaust
77 intake
121 transfer is where I set up all my saws
How does that work out for you? Would the saw size determine a change in those numbers?
Only suggestion - Widen the exhaust - seemed to make a difference on mine .
Love my 359 for smaller jobs(max 24” skip tooth). Ported 372 for big wood(36” skip tooth). Just assembling my 359 with 47 mm Hyway top end. 30 squish, exhaust105, trans 124, intake 73/73. All new bearings, seals. Like new…..well see….
Sounds like it should run good! Let me know how it goes!
Nice video, never ported a saw, however I am very interested in learning about this. I have to read up on this topic to better understand . Perhaps in the future you could share your experience and thoughts about porting, like a mini tutorial?
I hope your shoulder is feeling better.
Thanks for sharing
Stay safe
Thank you. I'm still new to porting myself. I've been sharing my experiences as I learn. I was thinking of doing a cylinder cutaway on an old saw to help in my explanations and theories. I feel it may help me wrap my head around it better.
@ that would be really cool to see.
Ive never done it, but lot of guys are advancing the timing 8 to 10 degrees watch novice lumberjack he did his and it makes a huge difference
I’ve seen it! I’d be willing to try it on my ms180 for sure!
First off I’m by far no expert and have never done a 359 but I do have one that someone else ported and it’s mean. I have Ported a few saws tho. I like the work you did on the lowers. From what I can see it looks pretty damn good. As far as Intake I wouldn’t move it any more, I think you’re base gasket delete gave it great numbers. You could move the exhaust back to 100 but I wouldn’t go past 100. I would prolly just keep it at 102 to give you some more bottom end power in a smaller saw. Then if you want you could change it later. I’d say it’s a runner and nice work
Also put your intake boot on and aligned correctly and mark a scribe line if there is a lip where it transitions to the jug. Take that down till it’s a nice smooth transition with no lip if that makes sense
Thanks! I was thinking the same so I started reassembling it last night, I can always go back in but I want to try it the way it is! Thanks for the advice!
I just finished your vid.. if you plan to run a 28 I for sure would not raise the exhaust. If you were to run say a 20 you might move it back to 100*
I would personally go for the 100 exhaust with 24 degrees BD. Don’t go for a 28” bar on this one. Can it do it…. Yeah it can but you’re gonna run a 24” much better.
You’re lower transfer work looks good to me. Check out a guy named the ironhorse. He does his transfers that way. He also likes 153-155 duration of intake. 22-25 of BD. He actually goes to 98 or 96 exhaust on a 372. If this was my 359 I would go 100 or 99.
I have a few videos of the saw after I finished, I haven’t tried it with a 24” yet but it pulls a 28” pretty good! I’m happy with it so far. Thanks for the info and suggestions! Maybe I’ll build another one!
Well, it's a late comment, but I think you're good where you're at for what ya got.
Thanks for the reply, even late its appreciated! I’m still so impressed with how it cam out I have another 359 I want to repeat what I did, just to see how close I can get it.
Take a look at this port job and timing number in the description - ruclips.net/video/iujEqPewt_Q/видео.html
Nice job! That thing rips! I was cutting some huge pine with mine today and I’ll be posting up a video later, check it out! It’s not bad.
@@sawsonthefarm Just watched your other videos with 359. It's awesome with that pipe. You made it? Nice job!
Thanks! I has some stainless pipe laying around and just started in!
You don't want to exceed 155 total
I would leave ur ex at 102 and maybe drop Intake a smidge to 78 and raise your transfers to 120 for 18bd......
What would that do for torque? Help or hurt?