Noob question-What is knock?
- Thread starter bpjr07
- Start date
NASSTY
Active Member
- Joined
- Sep 27, 2002
knock=detonation
when air/fuel mixture in the cylinder has been ignited by the spark plug and the smooth burning is interrupted by the unburned mixture in the combustion chamber exploding before the flame front can reach it. The engineered combusting process ceases, because of the explosion, before the optimum moment for the four-stroke cycle. The resulting shockwave reverberates in the combustion chamber, creating a characteristic metallic "pinging" sound, and pressures increase catastrophically. It can range from hardly noticeable to complete engine destruction.
when air/fuel mixture in the cylinder has been ignited by the spark plug and the smooth burning is interrupted by the unburned mixture in the combustion chamber exploding before the flame front can reach it. The engineered combusting process ceases, because of the explosion, before the optimum moment for the four-stroke cycle. The resulting shockwave reverberates in the combustion chamber, creating a characteristic metallic "pinging" sound, and pressures increase catastrophically. It can range from hardly noticeable to complete engine destruction.
- Joined
- May 9, 2002
Knock is much more serious in its results in a turbocharged car....Enough knock will hurt your motor, seriously.
Typically for us knock means detonation. Most common cause is a A/F mixture that is lean. The motor needs more fuel or more octane, or less air(boost) or any combination that creates smooth combustion. Our cars are capable of correcting for a few degrees of knock. But too much knock too fast can be catastrophic for these motors.
- Joined
- Aug 1, 2003
