Slang Time

[97silverbulletgsx]

what is the definition of your turbo car to be knocking?

[guitarXgeek]

Knocking is just another word for "preignition" or "detonation". To put it short and sweet, it's when there is too much heat in the combustion chamber (generally caused by a lean A/F, or too-low octane), and the fuel/air mixture ignites causing small explosions around the chamber before it is supposed to- which is when the piston reaches near top-dead center and the spark plug fires. Too much knock can cause severe damage to the engine internals! To sum it up, knock = bad.

I'll let someone else get more in-depth if they feel like it


EDIT >>> I just found this article on detonation/preignition/knock. It's VERY in-depth as it explains the actual differences between preignition and detonation. http://www.streetrodstuff.com/Articl...tion/index.php

[JoeWagon]

Knocking is a sound, and it happens either from detonation or a broken part, like a rod. Knocking in terms of tuning is covered extensively. Search around.

[95_GSX]

here it is straight from the FAQ thread stickied at the top of the forum. lets do a little research before we post. next here is kevin spreading his knowledge all over this board.

http://www.automotiveforums.com/vbul...d.php?t=164870