<VV> Pinging

[MarK Durham]

Brian, all I know is that when I rebuilt my 110, the engine did not run
real smooth nor did it sound 100% right until I adjusted the lifters to no
more than 1/4 turn in. I had them set at 1/2 turn (cold on the bench
adjustment) for the first 4000 miles, and I finally did a running valve
adjustment to likewise find a source for some unusual noise and the fact
that the engine would not idle down and adjust to spec.

I had put a Isky 270 cam in it and thought the "not want to idle down "
scenario was caused by the cam, but after the valve adjustment I was able
to set the carbs up to spec, plus the engine smoothed out and sounded
better, even though it lopes a little bit. Its like the engine was too
tight before with the lifter bodies adjusted at 1/2 turn.

Its my understanding that new style lifters are supposedly centered at 1/2
turn in, so going one full turn may be too deep and if that is the case for
your lifter style, that might be where the noise is coming from, too. I
know the book says 1 full turn, but that is for parts produced back in the
60's when the cars were new and the lifters were produced to a different
spec.

So my advice is to do a running adjustment  using the 1/3 valve covers to
keep the oil in; first adjust out to zero lash so the tapping just goes
away *on all of them*, and see how it runs, then *adjust in 1/8 turn
on all*while running, and see how it runs, then *go
to 1/4 turn if you want*, and see how it runs.  There is no need to go any
further in, the lifters are in their operating range at 1/8 turn and as
long as everything stays properly lubricated, the system should stay quiet
for years to come.

My "sweet Spot" was 1/8 turn in, so that is where I left them. When I went
to 1/4 turn, the engine slowed down and made some sounds I didn't like,
like something was binding a bit. But, it does not do this at 1/8 turn in.

When you get to that point, the engine will probably be smoother and
quieter.  Then  you can see if that helped what you think is pinging.

Just my thoughts.
 Mark Durham
Hauser, Idaho
62 Monza coupe Red/Red 4 speed
modified 64 - 110


On Wed, Mar 19, 2014 at 9:10 AM, Brian <bmoneill at juno.com> wrote:

> Is there any connection between valve settings--currently one ful turn
> down--and pinging?  A snewly built 140 has both an untraceable valve train
> noise and intermittent pinging.  Everything is stock to include NOS 304 GM
> cam.
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