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 Post subject: Pre-ignition sounds?
PostPosted: Wed Jan 16, 2008 12:16 am 
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Joined: Tue Sep 25, 2007 10:24 pm
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Location: Edmonton, Alberta, Canada
I know the obvious, "pinging" or sounds like somones tapping on the block with a hammer, tin can with coins etc. I've never had it that bad, but I do get another noise, NOT sure if it's from the engine, or the CTS Pot mod box in the glove compartment engaging... but it sounds like sparks arcing onto metal, rapidly, a really kind of electric tktktktktktktktktk, but barely audible, no lack of power at all.

I'm just wondering if this is an early sign of pre-det, or if I should really see if it's coming from the box...

Anyone have any insight?

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Last edited by clys on Wed Jan 16, 2008 12:24 am, edited 1 time in total.

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 Post subject:
PostPosted: Wed Jan 16, 2008 12:17 am 
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Location: Ontario, Canada
Pre-detonation?
Whats that?


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 Post subject:
PostPosted: Wed Jan 16, 2008 12:20 am 
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When the combustion mixture ignites before the spark does it's thing?

I know you're trying to make me look dumb here, just let it out! :oops:

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 Post subject:
PostPosted: Wed Jan 16, 2008 12:24 am 
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Location: Edmonton, Alberta, Canada
*correct term, PRE-IGNITION


Sorry.

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 Post subject:
PostPosted: Wed Jan 16, 2008 12:45 am 
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clys wrote:
I know you're trying to make me look dumb here


No, really, you're doing a fine job on you're own :-P


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 Post subject:
PostPosted: Wed Jan 16, 2008 12:56 am 
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Location: Edmonton, Alberta, Canada
Ahh, lay it on me superp00.

Upon further research, pre-igniton does not create a sound, or "ping" or "knock" as we call it.

Pre-ignition is where the air/fuel mixture ignites prematurely, usually at the very beginning of the combustion stroke. Caused by overheated spark plug or carbon ember.

Detonation, is what makes a "knock" or "pinging" sound. Detonation occurs AFTER the mixture has been ignited by the spark plug, and is the sound of two flame fronts colliding. The frequency is around 6400hz, at which frequency knock sensors are tuned to! They "hear" detonation FOR us!




I have been confusing pre-ignition and detonation for a while, but I now understand them completely.

pre-ignition will almost immediately destroy an engine, whereas detonation is "almost" safe for an engine, and does not cause large amounts of immediate damage.


SO, is the sound I am describing typical of detonation, or post-spark ignition?



I could make a reaaaaaaaaaal nice sticky thread on this stuff superf1y!

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