Hi 8Club

I recently came into a discussion with someone who insist that detonation is more severe than preignition (LSPI included), however, based on Engeneering Explained's video, I tend to believe that a preignition (LSPI included) is more severe due to the fact that it happenes before spark plug fire and the piston is way before TDC while a detonation happenes after spark plug fires and the engine can be way closer to TDC or even at/after TDC.

I would like to see what everyone thinks.

 

You sir are correct lspi is much worse.
In fact look at some almost all focus rs failures are form lspi. In fact you can almost tell which oils were not used when it happens. Several companies actually found a way to almost totally avoid lspi with oil formulas.

 

Love to hear which oils are the good guys and those which are the bad guys.
Yes this is an old thread but still good information is always
good and better late then never.