<VV> valve noise situation

[Mark Durham]

Excellent questions Bob, and I was going thru the same thought process. I
think he said up front the lifter was not pumping up, and was thinking the
lifter bore was not getting enough pressurized oil or the bore was elongated
so the oil pressure bled off and did not pump up the lifter. I've never seen
this. If it is true, maybe there is a obstruction in the oil galley which
has caused low oil and rapid wear. ??

If the lifter is pumping up, the noise might just be caused by the rockers
not at the correct angle due to too short push rods. They do tend to clatter
when the geometry is not set up correctly. Tim Did you check this?
Mark Durham

On Fri, Nov 27, 2009 at 1:51 PM, <BobHelt at aol.com> wrote:

> In a message dated 11/27/2009 6:04:59 A.M. Mountain Standard Time,
> N2VZD at aol.com writes:
>
> so i and  others who
> are in  the know still point finger at that darn  cam.
>
> Tim,
> I'm sitting here trying to visualize how a cam can cause valve noise. And
> I'm not getting any answers. Won't the lifters always follow the rising
> contour  of the lobes? And won't the valve springs (if working correctly)
> always
> push the  lifters down against the lobe contours on the lowering side? And
> at an idle, we  shouldn't have to worry about valve float or toss. So how
> can a "bad" cam cause  the problems you are experiencing?
>
> Also,  are you doing a running or static adjustment? If running, how do the
> lifters  respond to Zero lash? Do they hold a setting or not?
>
> Regards,
> Bob Helt
>
>
>
>
>
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