Pretty good break down of how and why. This is a little deep 4 me but entertaining enough I didn't lose focus. Knowledge is power, keep it up Big Guy👍s🆙
For the love of sweet baby Jesus- I hope every person who is looking into getting their saw ported watches this video. If I had a nickel for every time I've been asked "how many cc's will it be after you port it?" - followed quickly by "how much can you bore it out??"..... smh.
i have literally been asked that question 67 million times... i usually tell them i put a big block with 4 barrels in it and decided to ditch the supercharger
Crank stuffers interesting. Would be interesting to build a saw with crank stuffers then put a crank without stuffers in to see the performance differences .
That WOULD be interesting. My bet would be that there would be no noticeable difference in power in the cut, but if you compared them while doing ground work limbing up a big tree, you'd swear the crank stuffers gave a lot more power. They would make it rev quicker between cuts, making your ground work happen a lot faster.
Stuffers are plastic or aluminum. They bolt into a round hollowed out crank. Mx cranks have had them since the early 90s solid metal before that, and new saws Husqvarna/Stihl have them 🔧🔧
That would be a great comparison. You should recommend that on his channel. I'd love to see if they add anymore power, or if they are simply about quicker revs.
Once you have the decal sizes down perfect, they should be able to factory repop decals for a lot of us that are restoring some older saws with NLA decals if they are willing and they are reasonable.
I’m talking for the Poulan 3450,3750,330,380 on the decals as the others are most likely different sized except maybe the recoil and the clutch cover on some models.
Yep. Once everything is sized properly, I'll be making decals for all of them. Even the real Bad Boy decals. But the Bad Boy decals will not be sold to just anyone. I don't want people to be making bad boys out of just anything.
If you put them in then what about the crank bearings getting oil ? Every 2 stroke dirt bike I ever worked on had oil holes directed to the crank bearings and I don't see a way to do that in a saw.
Crank stuffers, to my understanding is about matching displacements above and below piston so as to have a more compressed charge when the transfers open........No?
This is an excellent way to look at it...minus the "compressed" portion...sort of. Err, it gets deep talking about this kind of stuff. So, you are right, matching displacements above and below the piston leads to a quicker and more efficient change out of the charge. The efficiency will be closer to a 1:1 ratio. With a larger crankcase, you may be more like a 1: .65 ratio. The movement of the volume will always lead to a slight drop in pressure on the bottom side of the piston. Without this pressure drop, air doesn't move and fuel isn't pushed out of the fuel tank and into the airstream. Therefore, when that charge moves to the top of the piston, it is entering a higher pressure environment and becoming slightly compressed by it, this leads to your volume being slightly smaller before the piston even begins to compress it. But...with a more balanced displacement between the top and bottom of the piston, the atmosphere on the bottom will need less of a pressure drop to create flow. With less of a pressure drop in you crankcase, the charge will have a greater volume once it is transferred to the top of the piston because there will be less compression when it changes back to atmospheric pressure on the top side of the piston. So, due to better flow characteristics, you can get closer to a direct 1:1 ratio from crankcase to combustion chamber. And this is what leads to higher compression. Your charge is more dense due to needing less of a pressure drop to create the flow. But you will never be able to have it perfect. There will always be a pressure drop on the bottom of the piston. Without it, flow does not take place.
Crank stuffers increase transfer velocity. It usually ends up giving you more bottom end. As rpms increase the flow gets choppy, so the top suffers. If you want rpms you'll need more crank case volume. It keeps it smooth. No disruption.
@@novicelumberjack Might ask someone more knowledgeable like Iron horse. I'm still a grasshopper, I've got some hands on, but nothing like him or Walker.
Don't know. Got the whole system at an estate sale for $5. But the head unit doesn't work. Need a new head unit before I know if the speakers are any good.
Hahaha, building my own crank stuffers is a little outside my capabilities! I'd have the little Wemars so out of balance it would destroy itself in seconds!
I've wondered why saw manufacturers wouldn't just run a solid metal crank. Weight reasons I'm sure but realistically a heavier crank would benefit some of them imo anyway 🔧🔧 good video I enjoy your sense of humor and content 👊
@@Revellersaws yes understand what you mean but ... Bike engines are either solid or stuffer cranks so could've been done on saws I'd think. I've I could post pics I'd show you. Have lots of cranks and rebuild them 🔧🔧
I realize you know this as well but when teaching you should strive to be as accurate as possible. Air as we know is a difficult subject but several times you said volume of air and what you really meant was mass and or density. The cylinder has a fixed volume and that won’t change. The mass of air can and that will affect the density. Blah, blah blah. You know all this as well. Mostly just commenting to comment and possibly help you become an even better instructor/teacher if you care to be. Even if that isn’t the goal, possibly it could be because you already have the entertainment part nailed! 👍🏼
Counterweight, the rod runs on the journal.
Pretty good break down of how and why. This is a little deep 4 me but entertaining enough I didn't lose focus. Knowledge is power, keep it up Big Guy👍s🆙
For the love of sweet baby Jesus- I hope every person who is looking into getting their saw ported watches this video. If I had a nickel for every time I've been asked "how many cc's will it be after you port it?" - followed quickly by "how much can you bore it out??"..... smh.
Hahaha! Having to explain it all the time must suck!
i have literally been asked that question 67 million times... i usually tell them i put a big block with 4 barrels in it and decided to ditch the supercharger
You did good dude! Don’t let the schedule thing take away your enjoyment.
Could the regulars maybe get tacos on Tuesday?
Thanks RC! I'll have some Del Taco delivered next Tuesday. And thanks for the real advice too. I am still very much enjoying it all.
Never even knew they existed..great info😊
Crank stuffers interesting. Would be interesting to build a saw with crank stuffers then put a crank without stuffers in to see the performance differences .
That WOULD be interesting. My bet would be that there would be no noticeable difference in power in the cut, but if you compared them while doing ground work limbing up a big tree, you'd swear the crank stuffers gave a lot more power. They would make it rev quicker between cuts, making your ground work happen a lot faster.
@@novicelumberjack Friend, a slight play on the crankshaft up down what can it cause?
This explanation really works for me. I enjoyed this.
That's great man! And thanks for telling me. It feels really good on this end when people tell I get something right.
So the air trapped in the crank case with stuffers would be less bouncy allowing the air to flow more positively allowing more rpm.
Stuffers are plastic or aluminum. They bolt into a round hollowed out crank. Mx cranks have had them since the early 90s solid metal before that, and new saws Husqvarna/Stihl have them 🔧🔧
Of course that all is dependent on the bore to stroke ratio.
Dyno Joe should test the stock 550 first and then take out those stuffers and see how those dyno curvs chance. Or a 545 and test it with stuffers.
That would be a great comparison. You should recommend that on his channel. I'd love to see if they add anymore power, or if they are simply about quicker revs.
Once you have the decal sizes down perfect, they should be able to factory repop decals for a lot of us that are restoring some older saws with NLA decals if they are willing and they are reasonable.
I’m talking for the Poulan 3450,3750,330,380 on the decals as the others are most likely different sized except maybe the recoil and the clutch cover on some models.
Yep. Once everything is sized properly, I'll be making decals for all of them. Even the real Bad Boy decals. But the Bad Boy decals will not be sold to just anyone. I don't want people to be making bad boys out of just anything.
Porting 2t's are more akin to changing cams.
I'd say that is a fair assessment.
If you put them in then what about the crank bearings getting oil ? Every 2 stroke dirt bike I ever worked on had oil holes directed to the crank bearings and I don't see a way to do that in a saw.
That would be a Bruce Cambell-ism
Yeahhhhhh Baby!
Great explanation! And a fantastic saw ya built , she is beautiful
Thanks man!
Crank stuffers, to my understanding is about matching displacements above and below piston so as to have a more compressed charge when the transfers open........No?
This is an excellent way to look at it...minus the "compressed" portion...sort of. Err, it gets deep talking about this kind of stuff. So, you are right, matching displacements above and below the piston leads to a quicker and more efficient change out of the charge. The efficiency will be closer to a 1:1 ratio. With a larger crankcase, you may be more like a 1: .65 ratio. The movement of the volume will always lead to a slight drop in pressure on the bottom side of the piston. Without this pressure drop, air doesn't move and fuel isn't pushed out of the fuel tank and into the airstream. Therefore, when that charge moves to the top of the piston, it is entering a higher pressure environment and becoming slightly compressed by it, this leads to your volume being slightly smaller before the piston even begins to compress it. But...with a more balanced displacement between the top and bottom of the piston, the atmosphere on the bottom will need less of a pressure drop to create flow. With less of a pressure drop in you crankcase, the charge will have a greater volume once it is transferred to the top of the piston because there will be less compression when it changes back to atmospheric pressure on the top side of the piston.
So, due to better flow characteristics, you can get closer to a direct 1:1 ratio from crankcase to combustion chamber. And this is what leads to higher compression. Your charge is more dense due to needing less of a pressure drop to create the flow. But you will never be able to have it perfect. There will always be a pressure drop on the bottom of the piston. Without it, flow does not take place.
BBB looks awesome! Nice work on the stickers.
Man, I'm so happy with it! It's such a cool saw now. Thanks!
Those are counterweights.....not journals
Agreed. The journal is the surface that the rod is connected to.
Good catch!
Crank stuffers increase transfer velocity. It usually ends up giving you more bottom end. As rpms increase the flow gets choppy, so the top suffers. If you want rpms you'll need more crank case volume. It keeps it smooth. No disruption.
So your saying...it gives quicker rpm's, not necessarily more of them?
@@novicelumberjack That's what I was taught. It's a two stroke so you know there's always exceptions.
@@novicelumberjack Might ask someone more knowledgeable like Iron horse. I'm still a grasshopper, I've got some hands on, but nothing like him or Walker.
@@timothybyrom5560 sounds reasonable.
That poulan's a Beauty!!
What are your shop speakers? They look a little JBL-ish....
Don't know. Got the whole system at an estate sale for $5. But the head unit doesn't work. Need a new head unit before I know if the speakers are any good.
@@novicelumberjack If you weren't 5hrs. away I'd give you a shop stereo. I have 375w on tap to some 98db 1w1m speakers...lol😉
Are you going to put crank stuffers on the Wemars so it can beat a Poulan in a wackoff ??
Hahaha, building my own crank stuffers is a little outside my capabilities! I'd have the little Wemars so out of balance it would destroy itself in seconds!
I've wondered why saw manufacturers wouldn't just run a solid metal crank. Weight reasons I'm sure but realistically a heavier crank would benefit some of them imo anyway 🔧🔧 good video I enjoy your sense of humor and content 👊
The crank is also a counterbalance, if you make it round the saw will rattle itself to death
Nailed it J&A T.
@@novicelumberjack hey---btw, stopped into wood-n-saws, told him you sent me. He was pretty blown away, said he didn't realize the power of UA-cam
@@Revellersaws yes understand what you mean but ... Bike engines are either solid or stuffer cranks so could've been done on saws I'd think. I've I could post pics I'd show you. Have lots of cranks and rebuild them 🔧🔧
@@thetwostrokerebuilder I hear you---but I think when you see round solid crank journals it means there is a balancer somewhere else
Night of the Living Dead.
Nope, but good guess!
Groovy? The Evil Dead!!?
Yeah! Well, for me it's more Army of Darkness.
@@novicelumberjack They are one of my favourite Movie!!😁
do something with the partner 5000.
Nice Vid!! I do watch your Video but I dont comment on each video cause I dont no what to Say. Lol
Glad to know your out there watching!
Hehehe 😁
Army of Darkness: Evil Dead 2
Yessir! Love me some Army of Darkness!
@@novicelumberjack I have it on DVD.
But have you read, "If Chins Could Kill"?
@@novicelumberjack no I cant read Chinese.
@@ozdatman hahaha haha! Look into it, it's a very funny book, if you like Bruce Campbell.
I realize you know this as well but when teaching you should strive to be as accurate as possible. Air as we know is a difficult subject but several times you said volume of air and what you really meant was mass and or density. The cylinder has a fixed volume and that won’t change. The mass of air can and that will affect the density. Blah, blah blah. You know all this as well. Mostly just commenting to comment and possibly help you become an even better instructor/teacher if you care to be. Even if that isn’t the goal, possibly it could be because you already have the entertainment part nailed! 👍🏼
Oh and fourstrokes suck 😆😆