Most modern cars, and 4 strokes in general now, use "2 stroke exhausts" on them. Resonance chambers don't just push exhaust back in, they also suck it out too, and can be used on both intake and exhaust cycles, to run a 2 stroke with zero crank case compression or no rotary intake valve/reeds. In the case of a 4 stroke, only the suck portion is used to increase exhaust efficiency in the exhaust. Acting as a kind of reverse turbo to empty to cylinder faster, more completely, and with less mechanical resistance. Gains are small, and only work in a vert narrow band, but it's effective enough that pretty much every cause you see on the road is using one. The same tech is also used in 4 stroke air boxes. *Most* stock airboxes on modern cars and bikes, will perform better then a "performance" cone filter on stock tune, because the stock airbox also doubles as a resonance chamber, using the "push" function of it to help force air into the engine. Stock airboxes and exhausts have a lot of money and research behind them to do this stock, because it's free efficiency gains/better emissions to do so.
what in the fuck was that lmao have fun guys also 2 stroke exhaust is no good for 4 stroke. It'll still run ok but when the positive pressure waves (high pressure) comes down the pipe and meets the expansion chamber, the step-up in pipe size send a negative pressure wave back towards the exhaust which is GOOD we want that it helps scavenge the cylinder the problem occurs when the pipe diameter at the end of the expansion chamber goes back to small. Sometimes I've heard this called a 'stinger' design i think?? So when theres a step down in pipe size the opposite happens, a positive pressure wave goes back towards the exhaust which on a 4 stroke just pushes exhaust gases back towards the cylinder, its not great for scavenging. The reason why this design is important for 2 strokes is because of efficiency. 2 strokes have ports instead of valves and theres more intake-exhaust overlap than 4 strokes so more intake charge escapes through the exhaust port. The positive pressure wave after the exhaust has expanded then got smaller helps to push some of the escaped air-fuel mixture back into the cylinder improving your power stroke and wasting less fuel. Its not a huge big deal tho, 4T doesnt care if its got a 2T exhaust it will run fine just not quite as well as with a properly designed 4T exhaust. This is relatively fine-tuning
Your hand is broke and how many bowls did you guys rip before this? Haha fire and duck tape is a no go. “I think you were supposed to hold it” hahaha bro
I'm high asf too and thought of this hahaha
Me to mane
Lol same here
Same
Lol
Nooooooo wayyyyyyyyyyyyy I just saw this 😂😂😂
2 stroke running lean
6:16
bless
The actually term for race build like this is 69 stroke if you run 2 stoke in it, it will become a 420 stroke.
Your on another level
6stroke?
no 42(0) stroke
8:05 to head sound
two stroke has a bad air leak probbaby near the flywheel crank seal (yes i know im 4 years late)
No problem bikes long gone now
I don't know if you guys know but a 2 stroke exhaust is the shape it is because it gives compression to the motor of the 2 stroke
It was for science
Most modern cars, and 4 strokes in general now, use "2 stroke exhausts" on them. Resonance chambers don't just push exhaust back in, they also suck it out too, and can be used on both intake and exhaust cycles, to run a 2 stroke with zero crank case compression or no rotary intake valve/reeds.
In the case of a 4 stroke, only the suck portion is used to increase exhaust efficiency in the exhaust. Acting as a kind of reverse turbo to empty to cylinder faster, more completely, and with less mechanical resistance. Gains are small, and only work in a vert narrow band, but it's effective enough that pretty much every cause you see on the road is using one.
The same tech is also used in 4 stroke air boxes. *Most* stock airboxes on modern cars and bikes, will perform better then a "performance" cone filter on stock tune, because the stock airbox also doubles as a resonance chamber, using the "push" function of it to help force air into the engine.
Stock airboxes and exhausts have a lot of money and research behind them to do this stock, because it's free efficiency gains/better emissions to do so.
@@akabiscuitwaffle I guess we where ahead of our time back then thanks for the info will be using the info in a future video for sure1
That shit sounded bad ass
Both ur bikes need some tlc my guy
I think he knows this buddy it’s pretty fucking obvious
bro the cr doesn’t even sound like there is mix in it
What does mix sound like
@@romanh.9271 🧀
@@akmcg oh ok
@@romanh.9271 Happy I could clear that up for you
Y’all put tape on an exhaust or is that not tape
yall high haha
That’s not an exhaust it’s a muffler
4+2 stroke=6 stroke
Lol the ktm one my pipes busted there so sounds the same it's insane
Sickkkkkk!!
Nice vid
These some fools 😂
What about the other way around
I sounds like perpetual bongo drums
3 stroke
Both bikes clapped
Sweet 😁😜👍
🤙🤙🤙🤙
how much for it
$500
Lawnmower
The tape🙈
what in the fuck was that lmao have fun guys
also 2 stroke exhaust is no good for 4 stroke.
It'll still run ok but when the positive pressure waves (high pressure) comes down the pipe and meets the expansion chamber, the step-up in pipe size send a negative pressure wave back towards the exhaust which is GOOD we want that it helps scavenge the cylinder the problem occurs when the pipe diameter at the end of the expansion chamber goes back to small. Sometimes I've heard this called a 'stinger' design i think??
So when theres a step down in pipe size the opposite happens, a positive pressure wave goes back towards the exhaust which on a 4 stroke just pushes exhaust gases back towards the cylinder, its not great for scavenging.
The reason why this design is important for 2 strokes is because of efficiency. 2 strokes have ports instead of valves and theres more intake-exhaust overlap than 4 strokes so more intake charge escapes through the exhaust port.
The positive pressure wave after the exhaust has expanded then got smaller helps to push some of the escaped air-fuel mixture back into the cylinder improving your power stroke and wasting less fuel.
Its not a huge big deal tho, 4T doesnt care if its got a 2T exhaust it will run fine just not quite as well as with a properly designed 4T exhaust. This is relatively fine-tuning
We trying to have fun experiment challenge physics and see what happens
Your hand is broke and how many bowls did you guys rip before this? Haha fire and duck tape is a no go. “I think you were supposed to hold it” hahaha bro
Every 2 stroke exhaust on four stoke bike video I see utilizes shit loads of duct tape lmao
You should really clean your carb
That 2 stroke sounds lean
It is
Just re did the edit and posted it again it sounded awful
sounds like a fuckin race car 😂
Sound more like ktm rc 🤣
Uhm what is this
Wtf
WTF HHAHAA
Lol so much for scavanging aye?
I dont care about your hand.
these bikes are straight junk lol
Gay
Ur mom
Not as gay as you
3 stroke