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opinions on spark plugs 

 

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 Post subject: opinions on spark plugs
Posted: Wed Jan 10, 2007 8:31 pm 
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hi guys

well i dyno'd my car today and i have a pinging issue.
ive had this problem sinse i put the au engine in..
anyway the car will ping even with the timing set at 5 deg so it was suggested that i should run a colder plug .
at the moment im running ngk zrg6b-11..
did some hunting around today and as far as i can find they dont make a zgr7b-11..

so do you think that a bpr7ey-11 would do the job..
or can anyone see me having issues with the plug being to cold???
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Posted: Wed Jan 10, 2007 10:48 pm 
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Have you tried a higher octane fuel? When they rebuilt the engine, did they remove the sharp edge around the combustion chamber?
Is the fuel pump delivering enough fuel pressure?
Does the fuel pressure regulator work properly?

 

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Posted: Wed Jan 10, 2007 11:10 pm 
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hi
im running it on premium ..
and its just a low km second hander from a wreck its got 77000kms on it .
its got excelent compression it has 210 psi on all cyl.

when i first got it going with the log manifold i had to keep the timing at tdc so it was drivable..
its now got bbm and el ecu. its got me stuffed why it still pings so much???

if i run the timing at about 2-3 deg befor tdc it doesnt ping but its gutless
at the moment its at about 5-7degree.. and it only pings under load or when the engine is warm ...and it pulled 133kw @the wheels on the dyno today. but it was pinging

ive changed all sensors and added a knock sensor..
so i thought maybe colder plugs might help???
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Posted: Wed Jan 10, 2007 11:23 pm 
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What was AFR on the dyno?

Is it getting enough fuel?
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 Post subject: Re: opinions on spark plugs
Posted: Wed Jan 10, 2007 11:42 pm 
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TROYMAN wrote:
or can anyone see me having issues with the plug being to cold???


Yes, they will foul up quicker as they wont be hot enough to burn contaminates off.

When you are setting the timing are you putting the ecu into diagnostic mods?

Are the spark plugs all the same colour? If only one plug shows signs of detonation it might indicate a faulty/blocked injector causing it to go lean.

Detonation can be a result of carbon buildup on the pistons and chambers. You can get fuel additives that will break it up, or you can spray a mist of water into the throttle body to give the engine a steam clean.

also 210 sounds like too much compression for stocker

 

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Posted: Thu Jan 11, 2007 3:50 am 
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Is the knock sensor hooked up properly?
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 Post subject: Re: opinions on spark plugs
Posted: Thu Jan 11, 2007 8:42 am 
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stockstandard wrote:
TROYMAN wrote:
or can anyone see me having issues with the plug being to cold???


Yes, they will foul up quicker as they wont be hot enough to burn contaminates off.

When you are setting the timing are you putting the ecu into diagnostic mods?

Are the spark plugs all the same colour? If only one plug shows signs of detonation it might indicate a faulty/blocked injector causing it to go lean.

Detonation can be a result of carbon buildup on the pistons and chambers. You can get fuel additives that will break it up, or you can spray a mist of water into the throttle body to give the engine a steam clean.

also 210 sounds like too much compression for stocker


yea i put in diagnostic mode and set it ..
the spark plugs are all the same colour and they have a purple colour to the outer electrode . kind of looks like there getting that hot they are glowing.. or because its pinging..

i thought that 210 psi was high but i have got 2 compression testers and both read about the same...
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Posted: Thu Jan 11, 2007 8:48 am 
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347stroker wrote:
What was AFR on the dyno?

Is it getting enough fuel?


at low rpm the air fuel started at about 15 and dropped down to about 12.5 at 120km then it dropped down to around 11.5 at 140km and roughly stay at that up to 180km
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Posted: Thu Jan 11, 2007 8:54 am 
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arm79 wrote:
Is the knock sensor hooked up properly?


as far as i know it is ..ive got a au knock sensor hooked up to the el ecu
there is a yellow/red wire which i hooked up to pin 23 and the yellow wire to pin 46..
the only thin that i can see being a problem is if the au sensor has different values to the el one??
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