Why closed port cylinders are high performance

[@theironhorse6600]

Only trying to help but you have the primary and secondary transfers mixed up on the quad loop! Erase this message after you read this if you want! I hope I’m helping! Keep up the good work!

[@novicelumberjack]

Oh HEY! I've watched so many of your videos! Thanks for the help. I was questioning it myself. Doesn't make sense to me why the exhaust side upper would come in first. Seems counter productive to shoving the spent gasses out the exhaust. Seems like it should be the other way around.

[@novicelumberjack]

Could you help me out with a video explaining it better? And...give my channel a shout out?

[@Doc-Cole_Trickle-of-Chainsaws]

@@novicelumberjack 👍🆙BigGuy

[@carllangley1764]

Great job on the explanation of information!! I really like the SUPERB sound effects , it really lets the kid out to play and that to me is the important part!!

[@homopit42]

Thanks for the explanation. With a small correction - on quad ports, primary transfer port is the one closer to exhaust port. The one closer to the intake is secondary transfer.

[@jamievanatta771]

Thanks for breaking this down in a way that's understandable.

[@novicelumberjack]

You're welcome.

[@cajun3197]

Been some great ported runners build from open ports

[@novicelumberjack]

Absolutely! You can modify anything. But...you get what I'm explaining. Heck, you probably know it better than me!

[@cajun3197]

@@novicelumberjack well I’d say I do. Why I have been trying to give you pointers when you’re off track

[@novicelumberjack]

I love your pointers, and thank you, but... you think open ports are as good or better than closed ports? Not talking about HEAVY modifications. Heck, anything can be modified enough to outperform something else. The bones of a cylinder. That's what I'm talking about. I'f closed port isn't better, then why would EVERY high performance 2-stroke use closed port designs?

[@cajun3197]

@@novicelumberjack i would only say that closed ports are longer lasting and have a bit more grunt because the charge is directed better. For high revs open are about the same performance

[@cajun3197]

@@novicelumberjack I think you did a good explanation though

[@pauljcampbell2997]

I learned a lot. Thank you!

[@Jesusiskingamen7]

Good video man I been messin around this helped me alot

[@marcoalvarez5682]

Great explanation thank you very much every day I learn something new

[@Alan_Hans__]

After seeing it explained like this I really don't know why piston sleeves aren't the done/common thing in 2 strokes. Much easier to cast and machine.

[@Doc-Cole_Trickle-of-Chainsaws]

Well done Big Guy👍🆙

[@budgillett9627]

Great explanation!

[@novicelumberjack]

Thanks!

[@tomjones4318]

That's a clear enough explanation anyone can understand.

[@blairguinea6811]

Thanks Brody, I thought I knew 2 strokes...................found your explanation fascinating

[@richardhatfield915]

Thank you

[@yankeenimrod2063]

nice work, very informative video , now I want to cut a cylinder in half !!

[@MsMohaman]

Hi. For example, the stihl ms 660 cylinder method of cutting out the bridge in the middle of the filler to make it look like e.g. At the husqvarna 55?? Thanks

[@Nicky_Pin_It]

Awesome Vid!

[@novicelumberjack]

Are you familiar with sugarloaf parkway, just north of Atlanta?

[@Nicky_Pin_It]

@@novicelumberjack nope...my name is for Sugarloaf Maine the ski resort

[@shawndavis1759]

thank you

[@novicelumberjack]

You're welcome!

[@julianlaustsen1991]

I learned that u should never port upwards or downwards because it ruins compression ratio, what are your thoughts on this?

[@vascopires2045]

Very nice

[@balazsporteleki3741]

Thank you, i got the difference

[@ChippyOutdoors]

Good explanation

[@novicelumberjack]

Why thank you Chippy! I appreciate it!

[@RussellHoughton]

I ordered the cheapest 353 cylender kit on Amazon last week expecting open port and it was closed port and looked better then a factory unit. But at the end of the day I just want it to work good. I don't care if it's open or closed.

[@Doc-Cole_Trickle-of-Chainsaws]

Hey RH, What brand or ASIN# is that cylinder kit on Amazon?

[@jordanhenson626]

That looks like my 372 cylinder

[@antea9055]

Can I use an open port cylinder on a crankcase built for closed port? Vice versa? (I have a 140s with broken cylinder and cant find a new one.)

[@novicelumberjack]

Should work fine as long as that saw has the option of an open port. What saw is it?

[@antea9055]

I have an Husqvarna 140s, 40mm, 32mm stroke and i can not find a closed port cylinder for it. Ive found a few open port cylinders that might work like the weedwacker 443r. Will a open port cylinder/piston work on a closed port crank case?

[@ozdatman]

Now talk about open vs closed in relation to case volume.

[@davidgoliath982]

ms250 is a good example of a very nice running open port. dont know enuf to say much more than that

[@peterjohn3180]

Kind of! There's no reason why an open port can't be angled away from exhaust, the angle upwards is more effected I think plus. In high performance cylinders the angle is not as angled away from exhaust to facilitate scavenging at high rpm. One way open ports get the charge to flow away from exhaust port is to have the port roof arranged so that the port open on the side opposite ex. Port first.

[@DoSomething-]

My open port cylinders rip

[@Topsiekku]

Kanavan muoto on liian törmäävä jos se on auki kokonaan

[@davesteier-xf5lh]

And there ain’t a single chainsaw enthusiast out there with a 3d printer that can replicate that damn Partner cylinder you got?? Then, if so, you’re on to going beyond machining process and can directly focus/work on flow now. Imagine a chainsaw running from the bottom side; That’s how the flow and “flow the cases” works on these things. /pine… Back To: Tapering, Channeling, Venturies… the angles of the dumps, their positioning behind the exhaust hell idk oh and Port Timing.. Rrrrr!!! RATS! Wasn’t it “EPA” was the reason for going to Open Ports? Closed Ports polluted”” more?? What was that? Just another marketing gimmick mask to get us to pay for it? “AWD”… “Quota” “Performance Evaluation..” Cuz I know for a fact! I’d pay $5 more for the saw and a “Xp” cylinder if that was the option. Because you CAN NOT just go out and put your hands on one of these cylinders, AS EASY as-if “it came with it”. Damn this 55 Rabbit hole!!! All this just for a damn chainsaw.

[@noclass2gun342]

That's definitely not a 440/460 cylinder... perhaps a 441 or 461, but definitely not a 440 or 460. The lower transfers on 440/460 are in the cylinder walls not on the base