Timing belt vibrations (video)

[petrv]

I probably figured out my problem with noise going form timing belt area after the timing belt change. I was not alone with this problem, more people have these problems.

I knew (and many people told this to me) that when I loose my timing belt, the noise stops, but I was worried about vibrations that the belt made when the engine was running. Today, I made some videos with my and my friend's lude to ask you about it.

Here are the vids:

---------------
Original state, with the tensioner set according to the Helms, the noise is still present:
engine running - no vibrations
belt slack with piston #1 at TDC - looks pretty tight

---------------
Loosened belt, so the noise has gone:
engine running - the noise has gone, but notice the vibrations at some engine speed. Is this ok?
belt slack with piston #1 at TDC - looks unchanged
maximum belt slack - I tried to rotate the crank and find the position with maximum slack - here it is. Looks loose.

---------------
I was really confused, so I called my friend with the same lude (H22 4G), but still with the auto tensioner, so the results should be the right ones.
engine running - the vibrations look exactly the same as mine
belt slack with piston #1 at TDC - looks same as mine.
maximum belt slack - again same as mine.

---------------
So, I hope the vibrations are OK, what do you think? Can I drive with this belt slack and vibrations? Or is this slack not normal?

[ripzone]

have any of those 2 engines been rebuilt cuz it could be the balancer shafts that rnt properly timed the reason i say this is cuz on my h22a i bypassed them and i have pretty much the same belt vibration as you and your friend but to me if no belt damage occures then there is no probleme anyway check out your balancer shaft