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#1
05-09-2017, 08:48 PM
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Whats your input on these plugs
I change plugs every year regardless of how few miles. At any rate I contacted NGK for their input. They said with my setup. 488 with ported edelbrocks a xr 288 cam n 10.6:1 comp. The iridium plug BKR6EIX in a 6 heat range is the plug to use. They replaced the NGK V Power 5672 A in a 8 heat range which I had usually used. They felt the 8 heat range was a little on the cold side and recommend a 6. (No nitrous on motor) At any rate the old plugs I pulled seemed to have a decent color to them. I installed the new plugs and drove it 20 miles. Pulled a plug and they were white. I have since went up 3 jet sizes and the plugs are still white. Not sure if I should keep going up on jets. Put a cooler 7 heat range plug in . Or just go back to a new set of my old plug style. The car does seem to run smoother . Any help is appreciated.
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#2
05-09-2017, 08:57 PM
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Let the engine tell you what it wants. If the old plugs were happy, why switch?
Eric
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"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
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#3
05-09-2017, 09:00 PM
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Unleaded fuel doesn't color plugs like ancient leaded fuel.
Modern fuel additives may put a green or orange tint on plugs...after ten thousand miles or more. Yank the plugs out of any feedback fuel injected engine after ten thousand miles, and they'll still be remarkably white--and yet the O2 sensor is assuring the fuel curve is reasonably close. Plug color means nothing. |
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#4
05-09-2017, 09:07 PM
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Looks a little rich maybe, can't see the strap that well for the heat range.
Try this page: Spark Plug Reading Mainly for racing, but gives you an idea of what may be needed? 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#5
05-09-2017, 09:14 PM
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I was looking at the strap for heat range also hard to tell.I pull and look at plugs all the time.I also run hotter plugs for street driving and colder plugs at the track.For street driving I like seeing a clean plug.At the track with a fresh clean plug you can see the heat range/ witness mark and see the base soot up after a full throttle pass..then one can make jetting adjustments..
More often then not just copy what others are using for heat range for plugs...I've never liked those little iridium centers.
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 Last edited by ta man; 05-09-2017 at 09:24 PM. |
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#6
05-10-2017, 12:03 AM
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Straps look like plugs are a little hotter than they should be, and the soot on some of the ring looks like a little too rich.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#7
05-10-2017, 08:26 AM
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Quote:
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#8
05-10-2017, 08:36 AM
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As Lust4rspeed posted the color change over point on most of the plugs is too far up near the plugs threads, as in too hot a plug, especially if these may have little full throttle time on them!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#9
05-10-2017, 12:32 PM
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Quote:
I seriously doubt there is a ngk listing for your exact combo. Only a generic listing for cid and year. If its not broken, dont fix it. --
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Bull Nose Formula-461, 6x-4, Q-jet, HEI, TH400, 8.5 3.08, superslowjunk Last edited by Blued and Painted; 05-10-2017 at 12:58 PM. |
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#10
05-10-2017, 01:16 PM
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Oh yeah, don't fix it , let the the plug over heat at full throttle and high rev's and cause detonation!
Just great advice there! Maybe like your signature states, that's why you have superslowjunk!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
05-10-2017, 10:01 PM
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Agreed. The new plugs are too hot, and they're burning off all the deposits so you don't see anything on the porcelain. By the time you jet for color, you're almost pig rich and down on power.
Jetting is judged by the fuel ring left at the base of the porcelain where it meets the body. You've got to cut the threads off to see that. I see on one plug where it is too rich because you jetted it up or it idled before you pulled the plugs. The heat is too far up the ground strap. The plug is marginally too hot. Those fine wire plugs are great.... for an LS that goes 100K between plug changes. And even some LS guys are using copper plugs in high HP motors, because that fine center electrode will glow like rudolph's freaking nose. I built a hot 5.3 LS for my Silvy, and I run the NGK TR55s, which is a copper plug. I just change them more often. Put a new set of the -8s back in it and check jetting. I'd rather run a plug slightly cold than slightly too hot.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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