Sparkies with highly advanced timing

StealBlueSHO

StealBlueSHO

Administrator
Staff member
I have probably 7K miles on my existing plugs... how often are you guys that are running really advanced timing changing out your plugs?

I'm gonna pull em and check their conditions, just thought I would ask...
 
Yea just did a quick check of bank 2... all looks good for the most part.. there is some brownish spots on the insulator at the tip... not sure what that is from..
 
StealBlueSho said:
Yea just did a quick check of bank 2... all looks good for the most part.. there is some brownish spots on the insulator at the tip... not sure what that is from..
Click to expand...
Did you happen to check the Gaps on them?. Z
 
Still looking for an answer.  Found this vague tidbit from NGK

DOES IGNITION TIMING AFFECT A SPARK PLUG'S TEMPERATURE?
A: Yes, ignition timing directly affects the firing end temperature of the spark plug. Advancing the ignition timing prolongs the time to compress the burning gases. The pre-ignition temperature also elevates gradually, since the pressure and temperature of the combustible mixture is low before ignition. Advancing your timing elevates firing end temperatures.

Insight from HOT ROD, the oracle ;)
http://www.hotrod.com/articles/spark-plugs-tips/
 
Checked bank 1... all look good, all gapped still at .030....

All have the burned brown spot by the strap on the insulator...

Unfortunately I have used three different tuners with multiple upgrades along the way since replacing them originally for Unleashed tune... so unsure which tune might have caused the burns on the insulator...

Might just thrown in a new set... autozone has them for 6.99 a pop.. plus some kind of coupon...

 
New set of SP-534's... purring nice and smooth... I guess all the tuning changes and datalogging over the past 7K miles put a hurting on the older plugs...
 
So even with the perfect gap on the older plugs, the new plugs made a noticeable difference?  Interesting.
 
SHOdded said:
So even with the perfect gap on the older plugs, the new plugs made a noticeable difference?  Interesting.
Click to expand...

It would appear so... or it's just placebo... but I was having what I perceived as a miss at the higher RPMs when I was hammering it... seems to have gone away now...

Or since my engine bay ate one of my original craftsman(made in USA) 8mm deep well sockets it damn well better be running better...
 
SHOdded said:
So even with the perfect gap on the older plugs, the new plugs made a noticeable difference?  Interesting.
Click to expand...

I am less surprised.  The tighter and more dialed in any tune becomes the more dependent it becomes overall on each component and each variable.  While the old plugs were fine at one time, the continued increasing tighter tolerances made the slightly used plugs play a great role in ignition variance. 

I had this once I did a small build on my vq35de,  after nismo cams, berks, nvidia exhaust and intake porting and a dyno tuned Orsis variant I found the old plugs ran like crap after about 15-ish-k miles, idled rough with tiny little misfires i could feel in the wheel. ran fine under load but in light loads i could sense a coarseness that was only corrected by gapping new plugs and jamming them in.
 
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