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Author Topic: Whats an Open Port Cylinder & Whats a Clam Shell?? Video explanation for Newbies  (Read 1551 times)

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Offline weimedog

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Some saw terminology...because I get a pile of messages on this topic!


Husqvarna 365sp/372xpw Blend, Jonsered 2171 51.4mm XPW build,562xp HTSS, 560 HTSS, 272XP, 61/272XP, 555, 257, 242, 238, Homelite S-XL 925, XP-1020A, Super XL (Dad's saw); Jonsered 2094, Three 920's, CS-2172, Solo 603; 3 Huztl MS660's (2 54mm and 1 56mm)

Offline Caloren

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Thank you for this video, I now understand a lot better about open and closed port, as well as other aspects of cylinder design.
Stihl MS 170, Stihl MS 310, Stihl 028 AV Super, and half a dozen other no-accounts! Cat D4 D.

Offline ljohnsaw

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Thanks!  Now I know how much I never knew! :-\  Very interesting.
John Sawicky

Just North-East of Sacramento...

SkyTrak 9038, Davis Little Monster backhoe, Case 16+4 Trencher, Home Built 42" capacity/32" cut Bandmill up to 54' long - using it all to build a timber frame cabin.

Offline RIDE-RED 350r

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Good vid!!

Now, I'm sure I am taking my obligatory shots at a long dead horse.. But I wonder why some saws are of the open port design?? Is it purely a manufacturing cost thing?
Swedish, you know, like the chef.

Offline woodsdog2015

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This is good information.  Thanks.
I'd rather be in the woods.
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Offline ladylake

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Good vid!!

Now, I'm sure I am taking my obligatory shots at a long dead horse.. But I wonder why some saws are of the open port design?? Is it purely a manufacturing cost thing?

 Yes it's a cost thing, open ports are cheaper to make, most closed port 50cc  saws cut faster than 55 to 60cc open port saws,  the one exception would be a Dolmor 6400 which has huge open ports and cuts good for 64 cc.  Steve
Timberking B20 15000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader


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