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Looks slightly lean, to me. Others, with more experience with this new gas, chime in...
Not an Autolite fan.
reading spark plugs doesn't work this way. Evaluation of street driving a/f ratio is much easier with a vacuum gauge and a wide band o2 sensor. In order to evaluate WOT a/f ratio and ignition timing, you need to start with a new plug, do one full power pass, and immediately remove the plug, then cut it open to see the base of the porcelain. Looking at a plug like the one in your hand with lots of street miles will not tell you much about a/f ratio or timing.
And what did they do before wide band o2 sensors?
Looks pretty good for a “street” plug pulled out. ( that’s what they did KK!, as you well know). Not overly rich or lean. Replace with the same heat range, don’t touch anything.
Off the pics, these ol' eyes say they look alright, but how many miles on them ?
Look good to me if they have been in there awhile . If not I'd say you need a different heat range if they have low miles on them
have been in there for over a year and and half.
Alot of run time? Race? Street driving ? Alot of Factor's I have a car that has had the same plugs in it since the 80's they look brand new still . I had one that needed a new set once every 2-3 months
modern fuel you never know what they put in it, i was talking to they from red line carbs in cali and he said that they tested gas on the east coast and even the ones supposed no ethanol , did have true amounts , and who knows what else they do to it so what you see on your plug ,unless its pure black i would leave well enough alone. is there a problem ?
i just replace 6 plugs on a e type jag , they looked brand new , it sat all winter. and had a stumble on take off. they foul so easy .with this new fuel after i replace them the stumble on acceleration went away.
A couple of thousand km since I've had it...and it cops its fair share of abuse on the street...has run a low 13 iirc before it came down under. Plugs may well be at least 5yrs old...
No problem, just trying to educate myself a little and learn more about the how's and why's ....
Do you use any octane booster or similar additive products? I only ask because the insulators look a little red-orange..timing looks to be advanced toward the max, how does it run? (It could just be the pictures playing with my eyes too...)
It's a bugger when cold but when it warms up it's great....when finished a cruise and putting back in the garage and put into park the revs go up about 3-400 rpm and then click back into drive it chirps the tyres...so it does need a little adjusting on the carbs I think...and it has a small hesitation just off idle when punching it.
Only used one can of octane booster since I've had it...will have to check timing.
I don't think that stuff hurts, just colors the plugs weird...as far as timing if it doesn't ping you should be fine