Oil and corrsion on spark plugs
#1
Oil and corrsion on spark plugs
I just changed the spark plugs and number 2 and 3 (counting from the front) had oil on the threads. There is also some corrsion which is worst on number 4 and there was also some white'ish dust on the outside of the number 4 coil rubber sleeve. All the tips look ok to me.
From what I understand, the oil is probably due to a leaking valve cover gasket but what about the corrosion - anything to worry about?
- Tom
#1
#2
#3
#4
From what I understand, the oil is probably due to a leaking valve cover gasket but what about the corrosion - anything to worry about?
- Tom
#1
#2
#3
#4
#9
However, here's my afr and ignition settings:
#10
Looking at this, it doesn't look completely wrong to me (or am I missing something?: NGK Spark Plugs USA
As for fuel and spark tables:
1. On fuel, you would like to get to 12.5:1 once you get above 85kPa. That will give you more power and cool things off a bit. Remember that the AFR table is a secondary control. It is only used when you are running in closed loop mode -- and only with limited authority (I only allow 5% deviation away from the VE table on mine). Most of the time on track you'll only be running off the VE table -- so you have to make sure it is well tuned (autotune or VE Analyzer).
2. Your spark table looks 2-3° too advanced across the board. Did you tune spark on a dyno? Did you use det cans and were you hot? Reducing the timing will help you cool things off.
If you spend a lot of time on track, a reroute is a good thing to do even if you're still NA. Without a reroute, the #4 cylinder runs quite a bit hotter than the others -- leading to the issues you're seeing here.
#11
Thanks Rick,
I can totally see what you mean about #4 and I will definitely run a milder tune - especially since I'm usually running RON99 but risk ending up somewhere with only access to lower octane fuel.
What I didn't understand was the other comments about all of the plugs looking like they were running hot. To me they look fine. Especially since they are around 3 years/40,000 KM old. But I'm close to clueless on spark plugs so I may be missing something.
- Tom
EDIT: By the way, my fuel table is thoroughly tuned with VEAL based on the above AFR table. The ignition map has not been dyno tuned but I kept an eye on knock detection back when I started running it.
I can totally see what you mean about #4 and I will definitely run a milder tune - especially since I'm usually running RON99 but risk ending up somewhere with only access to lower octane fuel.
What I didn't understand was the other comments about all of the plugs looking like they were running hot. To me they look fine. Especially since they are around 3 years/40,000 KM old. But I'm close to clueless on spark plugs so I may be missing something.
- Tom
EDIT: By the way, my fuel table is thoroughly tuned with VEAL based on the above AFR table. The ignition map has not been dyno tuned but I kept an eye on knock detection back when I started running it.
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