wyk
-
Posts
1,415 -
Joined
-
Last visited
Content Type
Profiles
Forums
Classifieds
Tip Site Directory
Blogs
Articles
News
Arborist Reviews
Arbtalk Knot Guide
Gallery
Store
Freelancers directory
Everything posted by wyk
-
Hrm, the cylinder on the left in that 375xpw pic looks more like a HyWay BB top.
-
I'll show images of both then go on with some explaining afterwards: Open port on the left, closed on the right: "Closed port" That is an Echo 500ES AKA Shindaiwa 502s punched out to 51cc. VS 45cc by the factory. The transfer covers have been removed from the outside of the cylinder to give you a clean look at the inside workings. Here are a pair of 375xpw closed port cylinders: As you can see, closed port allows you not only to keep the incoming charge away from the heat and turbulence of the piston, but also allows the engineers more room to design the route in which that charge takes before entering the combustion chamber.
-
Plug "MS461 Giveaway Saw Build Thread" into Google.
-
The MS361 is jokingly called a Husqvarna amongst some porters. It has a similar quad transfer port set up that many newer huskys have. It responds extremely well to porting, especially with machine work. One of my overall favourites ported. Most modern Stihls respond well to porting. They have a less aggressive timing curve than some of the modern Husqvarnas, especially the newer blue coil ones. So they seem to benefit from timing advances more. I rarely advance the timing on saws that I do not own, though. Most people do not notice the difference, especially in the UK where shorter bars are used. Once you run a 28" -32" bar on a 70-80cc powerhead, then small gains in porting make more difference. - especially in compression, timing, and transfer work. From what I have seen, the new 441CM has a whole lot going on inside, and is a bit of a bother to work with compared to most other saws - especially the huskies.
-
I see what you did there.
-
It sort of does. Dunno if it's been mentioned earlier, but I think the 560, and I know the 550, have idle bypass screws. In practice, on a ported saw, they sort of work a bit like the "L" screw when you adjust them. Snelling has used them to good effect to adjust out flat spots from idle in 550's.
-
One thing to consider whether you want to grease the tip or not - I have had a couple of Carlton and Oregon bars come to me without being greased from the factory. This means the first thing that lubricates the nose bearings are metal particles, and tree dust. It takes a while for the bar oil to soak down there as the centrifugal force propels it outwards unless the saw is at idle. So, check the sprockets first before you use them. Most tips have passages in the races for the grease to come out of if you over grease. Try it. This means that without grease, not only can grime enter from the passage, but also from the tip side. Not greasing at all means instead of grime AND grease, you simply have whatever bar oil finds that passage and mostly grit.
-
This is what a McCulloch 7-10(71cc) saw sounded like nearly 40 years ago before the EPA came into play - the mufflers were mostly there to keep one from going completely deaf - go to 1:50: [ame=http://www.youtube.com/watch?v=Dd2kup0ZO-s]McCulloch 7-10 - YouTube[/ame]
-
Due mainly to the piston and cylinder design, the Husky 346, 372, 390xp and the Stihl MS361 show great improvements with even mild porting. With woods or race porting, and some mild machine work, they are monsters.
-
The US EPA cracked down pretty hard on 2T motors and producers back in the 80's and 90's. It is one of the reasons you see so many US manufacturers die back then, only to be reborn as Chinese or otherwise foreign to the US companies in the form of cheap plastic junk after selling off their names. It is also one of the reasons we have autotune, MTronic and strato saws.
-
EPA - which is also why they are lean with tiny outlets from the factory. Same reason for lower compression.
-
How do ya like that Milwaukee impact? I saw the DeWalt and found it under powered for a 3/8.
-
All saws used for felling should come with full wraps. I'm ambidextrous when it comes to saws, so it's doubly handy for me. Nice dawgs ya got there, too. Here's my babies: Admittedly, that 372 rarely wore a 20" bar.
-
It helps to increase the compression ratio of the engine. The more compression you have, the more torque your saw can produce after a fashion. It can also allow for more aggressive port timing and tailoring the saw to run a certain way as well. That piston I showed, with some modifications, is running in this saw here: [ame=http://www.youtube.com/watch?v=OptyXKhsPbo]2165 BB ported with increased compression - YouTube[/ame]
-
So they released your wraps, then. Where is the photo?
-
-
This is a 59cc saw from the Pacific North West, AKA PNW. It's gonna look a lil' different than you're used to. Prolly sound a lot different, too, looking at how the muffler is modded...
-
Numbers just confuse me. Put them all in a row from 1-10 and it's even more confusing! And on another note...speaking of numbers: Weren't we just talking about importing saws from the US? This puppy has .035 off the combustion side of the jug and .045 off the base. That's inches were talking there More to come.
-
I hope you mean .075. And even then, that's a lot.
-
Very common in the States. I dunno where mines gone to Many mechs keep one on a key ring.
-
Thanks, Bud. I was hoping to find a 220 straight through. I see a lot of stuff from China, but was wanting to source it 'locally' first.
-
Anyone know an on line seller for variable speed electric foot pedals that will ship to ireland? I can't find anything like it here. The folks at DID were just confused.
-
If you can use the B&C's from your 660 on your 362, you don't need that 660...
-
It's carbon sequestration; only now in your chainsaw bar.
-
For non Germans: Incredible but not impossible | STIHL | Stihl, Viking, chain saws, brushcutters, hedge trimmers, clearing saws, high-pressure cleaners, lawn mowers, trimmers
