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Post by martyinmi on Apr 14, 2013 19:29:41 GMT -5
My nephew and I were out cutting a while back with my best running 360(I own three) and his Stihl MS 390. We were cutting up some good sized dead ash, and as long as they were in the 8-10" range, I could keep up with him alright. Anything bigger, his 390 spanked my 360 BAD. Who could I get to give it a good woods port? His 390 is stock with the exception of the screen removed. I just want it to pull a 20" chain better than that danged Stihl! If you know of someone who might do it, could you pm me their numbers? Hopefully I put this in the right area of this forum.
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Post by Brian VT on Apr 14, 2013 20:43:34 GMT -5
If you sharpen your cutters better than him you could probably beat him. ;D
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Post by martyinmi on Apr 15, 2013 14:58:54 GMT -5
I sharpened the chains on both saws, so I know they were both done right. I'm giving up 7 cc's and 30 years, so I'm probably expecting too much anyway!
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Post by tribulation138 on Apr 16, 2013 19:57:53 GMT -5
you have to bump the compression up to 170psi or higher. my sxl is pushing 180+psi and using a 24 inch bar. the sxl is only about 58cc's but has no problems at all.
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Post by Brian VT on Apr 16, 2013 20:55:01 GMT -5
you have to bump the compression up to 170psi or higher. my sxl is pushing 180+psi Was the stock squish thick ? If so, were you able to reduce the squish by thinning/removing the base gasket or did you machine the head ?
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Post by tribulation138 on Apr 17, 2013 16:13:36 GMT -5
you have to bump the compression up to 170psi or higher. my sxl is pushing 180+psi Was the stock squish thick ? If so, were you able to reduce the squish by thinning/removing the base gasket or did you machine the head ? in my opinion yes. I removed the whole base gasket and filed and smoothed the two mating services. then applied just permatex gasket maker.
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Post by Brian VT on Apr 17, 2013 18:43:47 GMT -5
What did you end up with for squish with no gasket ?
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Post by tribulation138 on Apr 17, 2013 20:22:31 GMT -5
honestly i didnt measure but for some reason some sxl's have more or less of squish zone. For example I tried running no base gasket on another sxl i have and it wouldnt let me. the piston top dead center would hit the top of jug. But my 180psi+ saw i was able to remove it.
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anvil
Saw Builder
Posts: 139
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Post by anvil on Apr 17, 2013 21:20:20 GMT -5
he might out cut your 360 but it will out last the ms390.
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Post by martyinmi on Apr 18, 2013 16:11:52 GMT -5
he might out cut your 360 but it will out last the ms390. I don't really care about the longevity of my 360 at this moment. I simply want to do a little butt kickin' on that Stihl. He calls or sends me a text almost daily wondering when or even if I'd like a rematch. What would a really good woods porting cost for a saw like my 360?
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Post by Brian VT on Apr 18, 2013 16:32:24 GMT -5
What would a really good woods porting cost for a saw like my 360? I would think $150-$200. Where are you ?
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Post by tommyhnavix on Apr 18, 2013 17:02:39 GMT -5
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Post by gooseidi on Dec 27, 2015 21:39:48 GMT -5
Funny, I got to compare my 410 to a 391. In all honesty, the 391 was lighter and ran better in smaller wood. Once the bars were buried, my 410 pulled it's 24" bar way better than the 391 did with its 20" bar. I sharpened both chains as well, lol
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Post by Supercharged86 on Dec 29, 2015 10:15:55 GMT -5
I sharpened the chains on both saws, so I know they were both done right. I'm giving up 7 cc's and 30 years, so I'm probably expecting too much anyway! Probably giving up a few thousand rpm's too, right?
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Post by sawnami on Dec 29, 2015 14:14:39 GMT -5
Square file!
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Post by 323calsniper007 on Apr 27, 2016 22:02:34 GMT -5
Was the stock squish thick ? If so, were you able to reduce the squish by thinning/removing the base gasket or did you machine the head ? in my opinion yes. I removed the whole base gasket and filed and smoothed the two mating services. then applied just permatex gasket maker. Whenever you remove your cylinder gasket you should always use a very fine rubbing compound between the two sealing surfaces and work it in until you can see that it is nice and flat on both sides. This will insure both surfaces are flat. Also this will increase your exhaust timing which is good but you will also lose intake timing. to get intake back to stock measure your og cylinder gasket and then cut that same amount out of your intake port. don't forget to match the carb abd isolater block to the port as well.
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Post by 323calsniper007 on Apr 27, 2016 22:07:49 GMT -5
Also check your squish, for a woods saw I wouldn't go any closer than .020"
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Post by 2stroked on Apr 17, 2017 10:36:29 GMT -5
Porting these cylinders will make a night and day difference in the way they run. I have one XL-12 in stock form and one I have " played" with. Try both run great but the non stock cuts so much faster. I honestly can't remember the port timings on the modded saw, but I do remember they were not mild, but not extreme either. I sloped the piston crown to help with timing as well. No base gasket, and a single ring piston for higher rpm stability.
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