Centrifugal Clutch In Slow Motion (Pushed to Failure)

I push Centrifugal clutches to failure and thermal overload while filming them with the high-speed camera in slow motion and Ultra slow motion.
I also show how clutches work in slow motion, this is a very entertaining video for something as mundane as a clutch, I had to make a crazy I had to make an exciting, there was hot metal flying everywhere so I hope you enjoy it!
I really thought the images were quite beautiful in slow motion.

2-Cycle Engine I Used:
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Watch this in 4k when possible, it looks incredibly awesome !

Carbon 12

Produced By: Carbon 12

Directed By: Matt Mikka

[traviscapehart]

The " supercharger" cylinders used on this engine work by smoothing out the vacuum pulse generated by the engine during the intake phase of the piston travel. When the fuel in the cylinder is lit off by the spark and the piston is shoved down the first port to be exposed is the exhaust port. Venting exhaust gases rush out developing inertia that helps start vacuum generation. The piston continues its downward motion, along with inertia trying to keep gases in motion. The amount of vacuum increases rapidly until the intake port is exposed by the motion of the piston wich is now near the bottom of its stroke. This is where the supercharger bottles step in. Normally the vacuum that has developed over the piston is now pulling air/fuel mixture into the cylinder. A portion of that vacuum is routed to the carb to operate the fuel pump. Because the engine is so small and only one cylinder is used vacuum is not constant, it pulses. The vacuum pulse is routed to a diaphragm against a spring and check valve in the carb. That is how the little slobberbox carb pumps fuel from the tank. The chargers help in two ways. First it extends the amount of time that vacuum is present by acting as a vacumm resevoir. This creates a stronger fuel pump stroke pulling more fuel. Secondly, smoothing out the vacuum pulse by making air instantly available at the piston face on demand and without carrying more fuel with it. When the mixture is right the entire crankcase will be wet with fuel for lubricating purposes, so the insertion of extra air during the pulse portion of intake cycle means more power during ignition. It will have a power band effect much like a tuned exhaust does br using sound to keep burning gases in the cylinder just a little longer. Its a great idea, but in practice its hard to pull off.

[davidandrex]

The molten hot spring spinning around and grabbing that piece mid air was amazing 4:56

[CriticoolHit]

What I find most impressive here is just how long that clutch is lasting under an entirely static load.

[MiguelMeanGreen]

This definitely is a great demonstration showing why you should keep your trimmer guard on your weed whacker. The guard (aside from obviously deflecting debris) actually contains a cutter blade that cuts your trimmer lines to equal and proper lengths. The length of the trimmer line while that head is spinning at full RPM's is actually your governor, and when you have MASSIVELY long trimmer lines, it's adding SO much more friction for that clutch to turn, resulting in EXTREMELY fast clutch shoe and drum wear and very often breaking the spring itself. Working at a power equipment place for nearly 8 years, I've seen so many landscapers destroy their clutches due to taking the guards off of their brand new trimmers. What's worse is all the metal dust that it sends all over the engine that cakes up onto the flywheel magnets and bearing surfaces. Literally there is no good reason to take a trimmer guard off with all that considered, let alone the massive additional stress it puts on the engine and drive components itself. This was a really neat thing to actually see happen in real footage, though!

[MrJdsenior]

Favorite part, 4:50, where the spring screams gets ejected while glowing, stretches due to centripetal force, and then gets all "wound around the axle"...so many great individual disasters coincidentally occurring there, all in just a few multi-K rpm turns of the shaft/clutch (previously) internals. I especially enjoyed the part where it said "oh no you don't", and dragged that poor chunk of escaped molten metal back in for more! Wonderful!!!

Clutch haters around the world would be proud. One interesting addition would have been a strain gauge to measure the poor beast's success/failure at transmitting torque throughout this transmissive torture. I thought about going all 'turbo encabulator' here, but figured this was bad enough.

The clutch in my son's Toyota, which after 300K + miles was slipping SOOO badly that he had to give up and turn around on hills (had been slipping since about 200K, but he kept insisting the engine would go at any time, even though it ran great, smoked not one bit, and was as noiseless as new, NO knocks or ticks.

I finally talked him into bringing it over to change the poor clutch out. The flywheel was still in surprisingly good shape, so he WAS being careful...and I'm not kidding, it would slip prodigiously with VERY minimal throttle opening, barely above idle, at the end. The valve cover gasket was leaking so badly you could hardly find the engine for the exterior gunk, so we cleaned it all of and I replaced the gasket while he wasn't looking (literally). You should have seen under the valve cover. There was NO gunk, not even a large amount of finger scrapeable brown discoloring, still mostly aluminum colored, so he was good about oil changes. I wouldn't be at ALL surprised if it goes another 100 K. He keeps it on principle now.

Other than the clutch, and getting hit sitting at a stoplight badly, which he had a guy pull out with a come-a-long so the lid would close again, he's had VERY few problems with it. Those Toyotas are (were, anyway) ridiculously well engineered, specd, and built.

I will send him this link, he will enjoy it, then give me back some smart-ass and/or silly remark, at which I will laugh. He's a good "kid"...though it's obvious he's an adult by every definition given that almost all of those are around-town miles. With your propensities, I thought maybe you would enjoy that story. If he answers this, he will be quick to point out that it was HIM who finally purchased the cover gasket, which is true, at some urging (it's going to give up any time now, it's become a family comic meme). ;-) I wish I could include a picture of it, it is so sad. He makes enough to buy 20 of these a year now, considering what he paid for it used, and it was in at least b+ condition then, at about 120K miles. I'm sure everybody at his place of employment laughs every time they see it, at least when they did. Like many, he works from home now. He does CAD work, and programs a lot of support SW for that system to lighten engineer work load as well. Once the owners figured out what he was actually doing for him, they love him there.

[alfaskripz]

The quality of these videos is astonishing

[carwashadamcooper]

When you leaned in to looked at that two stroke clutch, I was expecting a piece to fly out and get you.
Be careful, bro. We're born with ten fingers, but only two eyes...

[FraustByte]

Hey WP they're called booster bottles the concept of the is to catch unburnt gas/exhaust and force them back into the engine to be recycled and burnt off and provide more power.

[tabcreedence]

3:58 [dramatic voice] In the bowels of the earth, an ancient mechanism forged by giants powers the eternal forge of Cent'Rifukal, the hidden race that mines iron under the crust of our world.

[_ebuzz]

you may have an award winning industrial slo-mo short film. you capture all the elements a seasoned photographer or filmmaker would. it's quite beautiful.

[curillaenator]

4:46 - omg! 6:38 - these 2 tanks are "boosters" or boostbottles. Such booster helps air/fuel mixture to flow more stable through carb via rejecting pulses and fast pressure chages, therefore adds power to 2 stroke engine providing stable mixture under stable pressure on intake phase. It physically works as resonator by accumulating pressure generated by mixture inertia facing closed intake valve, and release this pressure when valve is open so it normalizes avarage pressure of intake. BUT! It's very delicate to tune such things on 2 stroke engines, it is hard to find right volumes, stiffness of bottle and lenght of hoses to achieve any significant power growth, so boostbottles are rare to see)

[LawpickingLocksmith]

Awesome! Thanks Matt. In the 70's kids in Europe had usually 4 years of moped time, 50cc limited. I had a Sachs 2 gear with standard cluch and later a Piaggio Ciao with such a centrifugal cluch. On every uphill section is kept slipping. I did so many Alpine passes and worried so much about the cluch pads. But now I see them in large quad bikes and they are super reliable. Btw the Kohler was designed in Italy for the Indian rikshaw market where the terrain is steep. Kohler was an Austrian migrant to the US who saw the light to add to his bathroom empire. I found in the City of Jaisalmer near the Pakistani border the rickshaws all use this engine to nail it up the steep fort. Crap diesel makes a big stink. Diesel unlike gasoline does not disperse well so the droplets burn the nitrogen in the air that combines with sulfur and moisture to form orange smog. Nox was hard to measure and VW found out the hard way! On the other hand the US is the largest NOx producer presumably for anesthetic uses but in reality 80% somehow finds its way into motor racing. Strange how an unwanted byproduct can either pollute or even act as a catalyst to increase power.

[StikkyNaideFace]

Diesel acts just like a big ass impact gun with how it chugs

[jeffreymurillo]

4:50 to 5:00 looks so awesome. The part when the spring grabbed a hold of that piece of metal and pulled it back, reminds me so much of God of War

[-I-declair-adumbwar]

the slow mo clutch explosion was one of the most beautiful things ive ever seen.

[Pants]

Excellent demonstration of just what an amazing material our metal alloys are. The deformation in that ring was astounding! We'd never have been able to build engines without such a durable but also flexible material. Here's to centuries of metallurgists and skilled metal workers whose work makes all our tough machines go!

[nellytubes]

that small diesel engine is making more torque than a honda civic

[jamest.]

The "tanks" are not really superchargers, they add to the air volume of the crankcase breathing 2cycle engine, changing the power band, similar to plenum volume, and intake runner lenth in a car engine. It works with the intake pulses, reflected waves and such, I don't know how well they work, but I guess they do,

[soufianedhaimini]

4:58 Spring: "piece of metal, where are you going? Come here!"

[jacoblawrence]

That slow Mo is seriously one of the coolest pieces of videography.