ECMLink quiz: real knock, or PK from vibration?

[EfiniX]

I turned down my knock control thresholds to 2750 RPM's/30% TP to do a bit of low RPM tuning and I'm seeing some knock at about the same RPM range and TP on each log. The timing doesn't seem nuts, and the knock isn't huge, but it's so replicatible that I can't figure it....

So, PK due to vibration at a certain RPM, or real knock?

(link to logs after the pics)






Log 1: click

Log 2: click

Thanks in advance, timing geeks.

 

[prove_it]

What fuel are you using? It looks like phantom knock to me, unless it's crap gas.

 

[EfiniX]

Chevron 92. Looks like PK to me, as well. I'm not running aggressive timing on the low-end.

Thanks for the feedback.