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What is pinging? 

 

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 Post subject: What is pinging?
Posted: Sun Mar 07, 2010 1:21 am 
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As Title States, what is pinging, and how bad is it?

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 1:25 am 
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pinging is a uncontrolled spark. like a bad spark. hard to explain. it's very bad for your engine. engines can be destroyed by pinging

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 12:04 pm 
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Pinging or detonation can be caused by a few different things including high compresion, advanced spark timing, lean fuel mixtures and insuficient octane in the fuel. And yes it can be fatal.

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:07 pm 
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WILDEB wrote:
pinging is a uncontrolled spark. like a bad spark. hard to explain. it's very bad for your engine. engines can be destroyed by pinging

sort of correct. It isn't bad spark, it is pre-ignition of the air/fuel mix in the cylinder.

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:22 pm 
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67RCE wrote:
WILDEB wrote:
pinging is a uncontrolled spark. like a bad spark. hard to explain. it's very bad for your engine. engines can be destroyed by pinging

sort of correct. It isn't bad spark, it is pre-ignition of the air/fuel mix in the cylinder.



which is caused by excesive heat in the combution chamber due to lean mixtures, dont want to sound like a smart a*** just wanting to provide some clarification.

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:32 pm 
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How do you know if your car is pinging ?

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:37 pm 
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It makes a pinging ticking noise under load from the engine.

How do you richen up the fuel then?
I use 98 fuel. Cleaned the fuel system and ran some octane booster and it still pings
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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:53 pm 
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87SIlude wrote:
It makes a pinging ticking noise under load from the engine.

How do you richen up the fuel then?
I use 98 fuel. Cleaned the fuel system and ran some octane booster and it still pings



sounds like you need the timming retarded then, upping the octane is just the first step to eliminating detonation. check your timming and see how it goes.

has the head ever been off and been shaved? if so how much?

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 2:59 pm 
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87SIlude wrote:
It makes a pinging ticking noise under load from the engine.

How do you richen up the fuel then?
I use 98 fuel. Cleaned the fuel system and ran some octane booster and it still pings


you dont want to richen it any more than nessesary.
or a slight cheat, in some cases a colder heat range plug can help reduce pinging.

but best off checking the timing first, then retard the timing enough to stop the pinging..
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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 3:07 pm 
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Get the timing right first. Set to factory spec, then advance slightly and test drive. Keep doing this until it starts to ping, then retard a little. This should be the optimum setting. Chances are the marks wont be accurate anyway, as another thread on here will testify to.
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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 5:06 pm 
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Ok I will try that. Wich way do you spin the distributed to retard it. Clockwise right?
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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 5:21 pm 
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sorry to sound like a mad noob, but if pinging is pre-ignition or ignition under compression,
then why would retarding the ignition timing of the spark plug make any difference?

if the fuel mixture/compression ratio/octane rating/engine temperature all remain the
ssame, wont the engine still ping?

-mad noob

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 5:49 pm 
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When the engine is running normally, the flame front in the cylinder moves at about 20 feet per second. Pinging is the flame front moving at about 2,000 feet per second.....hence an explosion, ping!..............That is why ignition timing advances with RPM.....to catch up.....not enough advance.....no power........too much advance...detonation before the ideal position of the piston.
Lean mixtures, and hot spots ( glowing carbon deposits ) can cause pinging.
Hence, polishing the cyl head chambers helps keep the carbon off....nothing to grip to.

 

 

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 5:59 pm 
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vrooooooom wrote:
sorry to sound like a mad noob, but if pinging is pre-ignition or ignition under compression,
then why would retarding the ignition timing of the spark plug make any difference?

if the fuel mixture/compression ratio/octane rating/engine temperature all remain the
ssame, wont the engine still ping?

-mad noob


preignition is a cause of detonation, not actualy detonation itself

preignition is often caused by elevated combustion chamber temp, caused by lean mixtures or possibly excessive carbon build up on the head.
Retarding the spark has the effect of falsely lowering the compression due to the piston being further through its stroke when the mixture is ignighted.

When dealing with the problem you dont change everything at once, comp ratio you cant change I'd start with fuel, timming then plugs in that order but thats me.

 

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9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track.
86 ZL mint grandpa spec with premo sound and 150000km
07 TTG 60000km stock as, mods to come.
97 el futura about to be MOCKed

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 Post subject: Re: What is pinging?
Posted: Sun Mar 07, 2010 7:05 pm 
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take to many e's and your pinging lol
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