Quote:
Originally Posted by Grape Ape
They are needed to force the lower portion of the follower down onto the base circle of the cam when it is in deact mode so as to be ready to reactive and probably keep the pushrod tip on the rocker. Without them the lifter might stay up where the cam lobe pushes it.
The AFM deact lifter could fail in a way that would cause it not to reactivate (and the valve not to open) or it could fail to deactivate (and act as a normal lifter). But I don’t see how it could cause the valve to stay open, at least not outside of a bizarre failure that would also apply to a non-AFM engine.
I think that the cuts are an illustrator error since the location of the cuts doesn’t make any sense for that head design.
I’m reminded of an infamous H&K pistol ad that showed the rounds loaded into the magazine backwards. The people who do this kind of work are not car guys or gun guys, they are guys who went to art school and somehow managed to learn how to make things that look like things. But if you don’t know what you are looking at you are libel to goof a detail every once in a while.
Or maybe they are just worried about valve float.
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Haha I will have to look for that H&K add. I didn't think about there locations.