Does a cam lobe open or close a valve

thexav

thexav

Pro Tuner
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Car
2002 Clio 172
I know how cams work as such but I'm wondering if the lobe bit opens or closes the valve.

A 280 degree cam is that 280 degrees of closed valve or open valve?

Sorry to ask a dumb question but I've seen videos where it shows valves open and close when the widest point of the cam lobe is in contact and they can't both be right!
 
The nose of the cam holds the cam open. It is durations of closed that you are talking about.

Bear in mind that in a four cylinder engine each cylinder works in just one quarter of a full rotation of the crankshaft and camshaft.

Here is a nerdy video about them and I'd recommend watching in 1.5times faster than normal speed.

 
That is pretty nerdy, but quite interesting. Thanks fella!
 
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