Quote:
Originally Posted by nikneo
Disclaimer: I'm not an expert on engine tech. cool?
The way petrol engines work, the fuel is meant to combust at a particular time interval within the engine cycle. This can change based on a lot of factors but severely with things like octane content of the fuel you use. If this doesn't happen at the expected time, then the engine produces a metallic "knocking" sound and hence the name. Most modern engines have knock detection i.e. they can detect when this happens and then 'retard the engine' i.e. change the cycle timing to minimize this.
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from what you explain, having a knock on the engine seems like a serious thing. Who would want to hear a loud 'knock' when driving lol
