Engine Knock -An End-Gas Explosion 650506

Knock in gasoline engines is due to an explosion in the preflame gases. Records of simultaneous light emission, pressure, and ionization signals require this interpretation. Before the occurrence of the knock pressure pulse, the pressure-time curves for the knocking cycles showed the same mean values and variations in pressure and crankangle time as with the nonknocking cycles. The pressure pulse was accompanied by simultaneous emission of light from a window and the triggering of a nearby ionization gap. The pressure pulse appeared to attenuate while traversing the chamber at essentially sonic velocity to a remotely located pressure pickup.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.