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Cam Theory 1800

posted by  Bennie on  Mon Feb 28 03:36 CST 2005
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last visit: Wed Nov 28 03:03 CST 2007
[RELATED]

I do not agree at all Paul, I checked this a number of times, you are wrong. :)

Check the drawing, this is what happens: The area where the lobe touches the lifter moves to the side. The red line is the contact area.



So when you look at all the contact areas you will find this: which is the picture I posted before, and which is what a worn cam looks like. THIS IS THE WEAR PATTERN. Please, do check it.



In real life this is what the lobes will look like:







Check the cam in the middle, you can see the two black spots: the lifter never touches this spot! With more radical profile this effect will get greater, which results in greater wear.

And when you look at the contact surface you can see why this happens:





So when increasing the lifters size, you are able to keep the red contact line as wide as the lobe itself, AND you can use a more radical profile without the lobe actually pushing the lifter from the side.

Have fun, cheers, ben






--
P131, '65, B20B+M47. P131, '69, B20E+AW71L+LSD. (www.tinustechniek.tk)






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