Thanks for the update Jesse - that issue is one for the record books!!
Agreed. I've seen a lot of weird engine problems over the years but never this. Added to my mental archive...
Thanks for the update Jesse - that issue is one for the record books!!
It turns out that either the intake or exhaust hydraulic lifter bodies was causing the problem. I don't know fully what was happening, but apparently at 2,500 rpm there was some resonance in the spring and the hydraulic unit was either not deflating or not inflating or over inflating, causing a valve to not fully close.
I would not be comfortable thinking the hydraulic unit is the root problem, as it cannot extend enough to hold a valve off its seat without a momentary reduction in opposing valve spring force. .
If the lifter does reach an undampened resonance, can it "float"?
DanH, Someone made a comment that the inner spring had "broken"' in the videos. I wonder if this might be related to our subject? John
DanH, Someone made a comment that the inner spring had "broken"' in the videos.
I wonder if this might be related to our subject? John