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Valve Float 

portworks
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This is a video showing valve float in a running engine at high RPM.

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7 июн 2007

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Комментарии : 746   
@thehaap
@thehaap 10 лет назад
OK, engineer here. What you are seeing in the video is not valve float - the title is wrong. Valve float is when the RPM of the valve train is so high that the spring does not have time to extend fully before the cam comes down again. IF this was valve float, you would see a video of a compressed spring that never seems to move back to its uncompressed state. What you ARE seeing is valve bounce, where the inertia developed by the cam is so high that the valve unseats itself slightly every stroke. Valve and spring rotation is normal at these RPMS. Finally, AlixHAF is correct - the reason it looks like the image is 'frozen' is because of the sampling rate of the video relative to the RPM of the vehicle, in the same manner that car rims sometimes look they're not moving in a video. It is based upon a part of signals theory called Nyquists Theorem, which I won't detail here but you can look it up if you're interested. Hope this clarifies things.
@Joolian.r
@Joolian.r 9 лет назад
this video makes me feel like im watching a nuclear explosion about to take out a whole city the all the noise and music and flashes
@ejstyleelytsje8292
@ejstyleelytsje8292 3 года назад
Anyone recommended after 13 years?
@cravenmoorehead5636
@cravenmoorehead5636 Год назад
There needs to be a seizure warning on this video please. I know someone who would have been on the floor watching this.
@BAYAREAMX
@BAYAREAMX 8 лет назад
Sweet, now I'm having a seizure.
@katrinan942
@katrinan942 9 лет назад
dude you need to go back to class that isn't float .. float is when the spring hasn't expanded all the way before the rocker start coming down again.
@davidrobert2007
@davidrobert2007 9 лет назад
That valve at the end is rotating so much it could almost lap itself in - just add grinding paste.
@Parents_of_Twins
@Parents_of_Twins 3 года назад
This video should have seizure or at least a migraine warning on it. Thankfully my wife wasn't in the room when it got to that part.
@billshiff2060
@billshiff2060 Год назад
Need to put a warning on this for inducing epileptic seizures. DO IT.
@215jami
@215jami 14 лет назад
This is why KMJ has my 20 bucks and I sleep at night
@tcmtech7515
@tcmtech7515 3 года назад
8000 RPM
@TheFordraptor16
@TheFordraptor16 10 лет назад
god i feel like im watching a very old horror movie.
@ryanfisher6402
@ryanfisher6402 6 лет назад
So amazing it stays together even for a minute or two!
@Ottodyn
@Ottodyn 13 лет назад
Great video, love the shot of the valve! In addition to spring pressure, cam profile plays a large part to minimize valve bounce too. Nice job!
@superdave2403
@superdave2403 3 года назад
Amazing video!! Great job! I never thought there was that much flex in the valve stem itself! And the rotation is interesting also!! Thanks I really learned something and I will remember what I learned and apply it toward my next engine build!!!!!!!
@noekiyu
@noekiyu 15 лет назад
WOW!!! I've never seen an inside view of a running engine like that! Very informative!!
@1989GTADRIVER
@1989GTADRIVER 16 лет назад
Amazing Video!!!!! This should help many people understand what's going on with their Valvetrain. The use of fast ramp rates just exacerbate the valve float problem. Better springs and lighter parts ie Valves, Retainers, Locks etc should alleviate the problem Thanks for the great Video!!!!
@johns818
@johns818 3 года назад
Valve float happens when the cam profile is too aggressive for the valve spring rate. The higher the lift, the stiffer the spring you have to use. Some people have the misconception that roller lifters add power.. but in reality it's just to alleviate friction from running super stiff valve springs.
@getoffmyinternet
@getoffmyinternet 15 лет назад
Agreed. To see it all in action, such as in cutaway, is always interesting.
@sambarros
@sambarros 15 лет назад
Congratulations on a FANTASTIC video!
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