i'm no mechanic and certainly no physicist and heat may play some small, augmentative role in helping the blades to spin but i'd say it's by far the lesser of the two in terms of importance. what is about as basic as it gets is that free spinning blades placed in the flow of a fluid will spin regardless of the fluid's temperature. what hasn't been shown is why heat would be necessary in this scenario, and if it is what are the physics behind that? how does hot exhaust exert a force on the blades over and above the force exerted by cool exhaust?
Unpopular opinion time: Having finally ridden my '21 850 factory turbo, it seems that aftermarket turbo mfgs/shops have no clue what they're doing
- Thread starter routter
- Start date
I was never suggesting that an engine and turbo could turn without CREATING heat, but again what we were talking about is the absolute bare minimum of things NEEDED to turn an engine and turbo. That bare minimum is airflow only. We’re not debating that airflow requires some kind of energy to create the airflow either.
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This is getting as bad as the " do tra ramps move"...hahaha
Well there's 2 different things in your question. Bare minimum would be air. But does that still require heat? Yes. Otherwise it can't operate.
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I agree. I gotta back outta this. Lol
No heat is required to run anything.
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I think it was a 165hp turbo kit doesn't have the disadvantages of a 200hp kit or something along those lines.
where's the dead horse emoji?
i'm gonna continue beating this dead horse.
it's really simple. all i'm saying is that a turbo doesn't need the exhaust to be hot to operate as designed. the fact that the exhaust is hot is incidental as it relates to the turbo. the rest of the engine or what got the exhaust to flow in the first place is immaterial. this was brought up because people say that heat is a critical attribute of the exhaust in getting the blades to spin and if that's true, i'd love to know why.
This thread is woke
Lmao c'mon man. Hot expanding Gases are what spins the compressor wheel faster to build boost. Otherwise it's a 1 to 1 air flow ratio In and out of the engine and zero boost is achieved.
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If the exhaust has enough velocity it will spin the wheel and build boost. As the engine revs, the increasing amount of exhaust is building pressure since the dimensions of the exhaust plumbing are static and the exhaust is forced thru the turbo.
Heat also builds pressure so that’s the question, how much of a pressure increase does the heat provide?
I’ll revisit this if/when I get some definitive info. This guy addresses the heat question.
autoexpert.com.au
Heat also builds pressure so that’s the question, how much of a pressure increase does the heat provide?
I’ll revisit this if/when I get some definitive info. This guy addresses the heat question.
The physics of turbochargers (for dummies) — Auto Expert John Cadogan
Turbochargers return to the engine energy that you would otherwise waste in the exhaust - literally pumping up the efficiency. What's not to like?
autoexpert.com.au
If you read what I wrote to prompt this response, you would see I asked no questions.
If bare minimum were air, on a hot sunny day, why is my motor not turning? Airflow period
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the volume isn't what turn the turbo. yes you don't have more air coming out than coming in. it's the velocity of the compressed gas exiting the cylinder that makes the turbine spin fast.
you just created an explosion inside the cylinder the force going out is greater than the air intake pressure
pack 1500psi of theoric cold air into your cylinder and open the exhaust valve in a millisecond, will it turn the turbo fast? do it a thousand times a second will it work?
heat plays a role but it's not the main force.
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Of course they do! In circles when you start the engine.
C
caper11
Well-known member
Holy smokes, I dunno why I tried to read all of that, is is obvious that some do not understand how turbines work. Anyway......
My 2021 is the fastest stock trackspeed sled I have ever owned. The sled rips! It was pretty cool to rip by a bunch of stuck cats and polaris sleds stuck on a hill, and I blew by them like it was hero snow.
I cannot wait to see what it does out of break in.
There is a hood design issue I do not like when riding it in 4 ft of heavy fresh snow, the snow accumulates so much it will choke the engine, and create a nice scoop to spray snow in your face, the only times I’ve been stuck is because of the engine starving for air.
The 2021 clutching calibration is off as well, I dunno why doo lightened the flyweight over the 2020.5, but the sled overrevs, lots of guys have noticed overreving, I had to put 2g in my brothers.
My 2021 is the fastest stock trackspeed sled I have ever owned. The sled rips! It was pretty cool to rip by a bunch of stuck cats and polaris sleds stuck on a hill, and I blew by them like it was hero snow.
I cannot wait to see what it does out of break in.
There is a hood design issue I do not like when riding it in 4 ft of heavy fresh snow, the snow accumulates so much it will choke the engine, and create a nice scoop to spray snow in your face, the only times I’ve been stuck is because of the engine starving for air.
The 2021 clutching calibration is off as well, I dunno why doo lightened the flyweight over the 2020.5, but the sled overrevs, lots of guys have noticed overreving, I had to put 2g in my brothers.
You two are remarkably secure in your beliefs especially as a self professed not mechanic or physicist, unfortunately you are both wrong. So wrong that I hope you are trolling.
Heat increases the pressure differential across the turbine. Go find a friend with a turbo anything with a boost gauge and floor it in neutral and then go drive it and floor it in while driving in gear and report back which made a higher boost number on the gauge.
Please start your own thread and stop ruining this one. What started out as a good platform to discus the technology of the new ski doo turbo compared to aftermarket turbos has turned into a boring, personal bickering match about how turbos work or make power. Not at all what the OP was trying to talk about or bring to light. Please have some respect for that and others on this forum, and move on to your own topic of turbos, which most likely has already been discussed ad nauseam. Thanks
Now back to the original topic...I rode a completely stock turbo doo last year and that sucker ripped. Was very impressed at the throttle response, snappiness and overall smooth power that was always right there. No lag or hesitation at all. And that was only at 1000’ elevation. But, another stock NA doo with only a clutch kit would beat it by a length or so in a pull up a 200 yard hill. Clutch kit the turbo, and most likely would be the opposite results. Having only ridden a couple aftermarket kits on buddies’ sleds, I can say that the instant throttle response and controllable power of the the factory doo is flat out awesome! And again, I only rode a completely stock one. If it was turned up and dialed in like they’re doing now, it’s gotta fly!
Now back to the original topic...I rode a completely stock turbo doo last year and that sucker ripped. Was very impressed at the throttle response, snappiness and overall smooth power that was always right there. No lag or hesitation at all. And that was only at 1000’ elevation. But, another stock NA doo with only a clutch kit would beat it by a length or so in a pull up a 200 yard hill. Clutch kit the turbo, and most likely would be the opposite results. Having only ridden a couple aftermarket kits on buddies’ sleds, I can say that the instant throttle response and controllable power of the the factory doo is flat out awesome! And again, I only rode a completely stock one. If it was turned up and dialed in like they’re doing now, it’s gotta fly!
"Please start your own thread and stop ruining this one. What started out as a good platform to discus the technology of the new ski doo turbo compared to aftermarket turbos has turned into a boring, personal bickering match about how turbos work or make power. Not at all what the OP was trying to talk ab'out or bring to light. Please have some respect for that and others on this forum, and move on to your own topic of turbos, which most likely has already been discussed ad nauseam. Thanks"
you're right and apologies to the forum.
you're right and apologies to the forum.