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Can having the wrong spring pressure cause the engine to feel like it has a rev limiter?

Very Kool video to see the reality of what happens.

Unbelievable what the valvetrain has to endure in a normal low rpm daily driver, much less 8000+ rpm with severe pressure valve springs.

This is 100% a terrorist propaganda video.

Very cool video. Anyone want to comment on the top of the valve moving left to right when the valve is doing the bounce. 0:59 to 1.20 in the vid.

Hello , question if using over head cam and solid lifter buckets with shims inserted (removable)under the solid bucket (valve lash .012” intake and .018” exhaust) is there a risk of valve floating making the shims to be out of the bucket? How deep does the shim need to be inserted to be safe? There are some supertech solid lifter buckets with inserted shims but i am not sure to use that ,best regards. Can i contact you guys via email?

feels like the chernobyl reactor

Merci pour les gens épileptiques...😢

Its can destroy the valve stem

See, you push the spring just like this:

Feels like an episode of the mandela catalogue

I think my rods just fell out 😅

Notice how the valve stem tip wobbles. Lots of stem flex. And most think that guide wear comes from the rocker tip being off center.

Valve clearance too high... 🎉

Valve guide wear is bad ! deflection of the valve stem is massive Rob NSW Australia

As I think I remember it, the Volvo P1800, according to a Car and Driver test article in the early 1960’s, was capable of valve float. The engine was incredibly strong with an actual five main crankshaft bearings. One 1966 P1800S holds the record for the highest mileage car of an original owner of non-commercial use at 3.2 million miles. Comments from any fellow old timers??? Interesting video!

I remember when I was young and just learning about fixing cars ‘( 87, ) some guys said valve float was accelerating as fast as you can and when you reached max rpm let off and hit the breaks….i always questioned that and where as I never became some super race tech ( I prefer cars all factory, and I do refrigeration ) I could never believe that. I have rebuilt a few engines in the VW air cooled area and more in the Honda 96-2012 line and consider myself a decent tech, the valve float thing is real but rare from my view point

The valves are supposed to rotate so the portion of the stem that the rocker arm contacts doesn't wear a a singular spot at the point of contact. The keepers and spring retainers and springs are all made to help induce this rotation.

Watch it at 2x for 30k rpms

Is the Rotor shaft shaking or am I seeing

I'm glad almost everything I work on never goes past 2250 RPM, Well some stuff goes a bit higher. I saw a big cam Cummins explode an air compressor at something like 4500

It seems that the valve guide is worn, because the valve has radial movement.

And to think that the cam is half crankshaft speed.

very cool vid

thumbs down, this caused me to have a seizure. now i can't drive for a year....

Thats not valve float, that's spring surge.

Great video

There needs to be a seizure warning on this video please. I know someone who would have been on the floor watching this.

Need to put a warning on this for inducing epileptic seizures. DO IT.

It would be nice if you were to explain at the beginning but we're actually looking at this is useless

This is like a horror film

Poor valve spring. Lol

Looks like that could be hell on the guides...

TH-cam took me here with this suggested video, if i was epileptic, i bet i was having a seizure right now

imagine if someone had an epileptic seizure watching a valve float video

Is the roller on the rocker spinning like crazy?

This is a fucking horror movie.

ATTENTION!!!! It's worth noting that what you're watching is a strobed video. The differences between frames are NOT real time slowed down, they are differences between each cycle (at best, at worst it's some number of cycles between frames). It's like watching a video of a wheel turning and at some point it visually slows down and stops even though you know it's still turning super fast

Filmed with a potato

Do you think the gides are shot

Just use the correct valve train parts when building your engine for intended use, and you won't have to worry about shit like this!!

Seat load of the spring is only part of the reason for valve bounce. Under extreme dynamic conditions, coil surge changes the seat load. If the valve seats when the coil surge is heading up the stem, it can unseat the valve if the acceleration and amplitude of coil vibration are high enough to overcome the static seat load.

Worn out valves are awesome! I just love the pop and crackle sound when I let off the gas at high RPM.

My eyeballs hurt

As expecting falsely promoting their product... so many watch yet so many still don't understand watch they just watch ...but faith in the so-called expert cause us want to buy their crap. I watch and I see nothing abnormal... and why didn't they show a video of a normal spring versus a floating... Pointing out the bounce of spring and rotation of valve which all are expected ...spring bounce and circular n cylindrical objects rotates. Reality is majority of us don't need to upgrade valve considering the minimal modification done to engine... I call this propaganda!

I didny real-ysé the valvé é Spinn ¡¡¡¡

who wants to run engine at 10k rpm ...????

Warning for epilepsy

It's amazing how these engines survive even one round of this abuse

Looks like valve guide is shot