Do these plugs look ok?

Engine, Trans & Driveline

  1. crossram 426

    crossram 426 FBBO Gold Member FBBO Gold Member

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  2. miller

    miller FBBO Gold Member FBBO Gold Member

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    Looks slightly lean, to me.
    Others, with more experience with this new gas, chime in...
     
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    • Bill Monk

      Bill Monk FBBO Gold Member FBBO Gold Member

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    • Don Frelier

      Don Frelier FBBO Gold Member FBBO Gold Member

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      Not an Autolite fan.
       
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      • Craig Jorgensen

        Craig Jorgensen Member

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        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.
         
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        • khryslerkid

          khryslerkid FBBO Gold Member FBBO Gold Member

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          And what did they do before wide band o2 sensors?
           
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          • oldbee

            oldbee FBBO Gold Member FBBO Gold Member

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            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.
             
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            • WileERobby

              WileERobby FBBO Gold Member FBBO Gold Member

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              Off the pics, these ol' eyes say they look alright, but how many miles on them ?
               
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              • Bb70charger500

                Bb70charger500 FBBO Gold Member FBBO Gold Member

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                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
                 
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                • crossram 426

                  crossram 426 FBBO Gold Member FBBO Gold Member

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                  have been in there for over a year and and half.
                   
                • Bb70charger500

                  Bb70charger500 FBBO Gold Member FBBO Gold Member

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                  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
                   
                • 67belvedere/225

                  67belvedere/225 FBBO Gold Member FBBO Gold Member

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                  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 ?
                   
                • 67belvedere/225

                  67belvedere/225 FBBO Gold Member FBBO Gold Member

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                  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.
                   
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                  • Bb70charger500

                    Bb70charger500 FBBO Gold Member FBBO Gold Member

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                    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
                     
                  • crossram 426

                    crossram 426 FBBO Gold Member FBBO Gold Member

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                    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...
                     
                  • crossram 426

                    crossram 426 FBBO Gold Member FBBO Gold Member

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                    No problem, just trying to educate myself a little and learn more about the how's and why's ....
                     
                  • beanhead

                    beanhead FBBO Gold Member FBBO Gold Member

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                    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...:D)
                     
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                    • crossram 426

                      crossram 426 FBBO Gold Member FBBO Gold Member

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                      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.
                       
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                      • crossram 426

                        crossram 426 FBBO Gold Member FBBO Gold Member

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                        Only used one can of octane booster since I've had it...will have to check timing.
                         
                      • beanhead

                        beanhead FBBO Gold Member FBBO Gold Member

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                        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
                         
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