https://www.youtube.com/embed/WtqDHJDN79w
What does a valve spring look like when it's operating at 8500 rpm?
Thanks to the magic of slow motion, we can see that valve springs move around quite a bit.
https://www.youtube.com/embed/WtqDHJDN79w
What does a valve spring look like when it's operating at 8500 rpm?
Thanks to the magic of slow motion, we can see that valve springs move around quite a bit.
In reply to GameboyRMH :
Exactly why I felt the need to share, definitely a lot more movement than I would expect from a valve spring.
Lotus has a piece of software that calculates the motion of all the individual coils of a valve spring, since that's pretty critical to determining valve float.
Can someone please explain why it's rotating so much? I'm genuinely curious and can't really figure it out. I assume vibration but then why wouldn't it just find the 'heavy' end of the spring and stay there?
In reply to Colin Wood :
Think of the energy lost with the weight of the lifter, pushrod, and rocker arm. In a typical pushrod engine.
Compare that to an overhead camshaft that acts directly on the valve.
wako29 said:Can someone please explain why it's rotating so much? I'm genuinely curious and can't really figure it out. I assume vibration but then why wouldn't it just find the 'heavy' end of the spring and stay there?
It's rotating because when you compress a spring there's a 'twist' (moment about the axis of the spring) component to the force as well as the axial force. All the little vibrations of the individual coils also impart this twisting force.
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