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Old 05-09-2012, 06:23 PM
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Reading my plugs, your opinions

Doing some tuning on my BBF 532Ci Kaase p51 headed monster. Heres the plugs and I would like your guys opinions on them. From everything ive read the sooty stuff on the threads is because of a rich idle, The color of the strap looks normal to me, the timing was still too far advanced when i took these out. Im not clear on what color the "porcelain" should be some say it should stay bone white or some say tan like mine are.

Im running a holley 4150hp 1000CFM, MSD ignition and billit dizzy, 10.8:1, on 91 octane

Now it has size 88 jets in the rear and 82 in the front, Im thinking ill drop to 86 rear and 80 in the front. But then again i like the color of the strap so im thinking maybe just drop the rear from 88 to 86 and leave the front and mess with the idle mixture screws to lean out the idle a little bit. What do you all suggest?? Thanks!
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Old 05-09-2012, 06:24 PM
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Couple more pics,
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Old 05-09-2012, 09:25 PM
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Very rich at idle and cruise and the timings a little off? No expert trying to learn my self.
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Old 05-10-2012, 01:02 PM
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look at ground straps.
color change should be right in the middle.
too close to tip of strap is too little timing.
too close to base means too much timing
(it should fall right at the middle of the radius)
plugs look a bit hot to me ,the ones with the tan color seem to be ok.
but the base tells me your pretty rich at idle. (black sooty etc)
I had same issue with off the shelf holley and ended up getting a new main body with adjustable air bleeds to correct the overly rich idle.
here is some color charts etc.
http://www.4secondsflat.com/plug_chart.html
http://www.4secondsflat.com/Spark_plug_reading.html
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Old 05-11-2012, 04:12 AM
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The plugs were Autolite ar3923- I just put in some ar3934 I played with my idle mixture screws last night after dropping 2 jet sizes front and rear. Hooked up a vacuum gauge (teed off the pcv) and had 13in of vacuum, that was the best I could get playing with the idle mixture. Timing was high at 34 now its at 30 total. I'm going to get her out for a drive tomorrow and see how it reacts
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Old 05-11-2012, 10:53 AM
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To check my idle mixture, do I really need to drive theed car? Or can I stick new plugs in and idle it for a while then check? since driving it would be running of the jets instead of the idle circuit....?
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Old 05-15-2012, 05:19 AM
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bump, anyone for checking idle mixture alone?
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