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Spark plug Reading Guru's #2742440
02/12/20 10:16 PM
02/12/20 10:16 PM
Joined: May 2014
Posts: 179
California, U.S.A.
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Torquemonster440 Offline OP
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Torquemonster440  Offline OP
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California, U.S.A.

Hey guys, does it look like the new Accel "shorty" header plugs I'm swapping to will be a hotter plug than my previous NGK'S ? It looks like the ground strap is quite a bit longer on the Accel's. Accel p/n 0416-S. The NGK's are p/n BCP6E S.

The last pic is of the NGK'S after about 200 miles around town and 3 passes. Then I blew a hole in my header primary on pass #3 and had to "upgrade" headers. Now I need header specific plugs, and a custom built wrench to pull my plugs on the passenger side. frown by the looks of this pics I'm lean ..with too much timing to boot. I'm afraid the Accel plugs may exacerbate my lean condition. I know I can tune it out, just looking for some input from some more experienced racers.

Thanks, Dave

20200212_174634.jpg20200212_174744.jpg20200212_175704.jpg

1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
Re: Spark plug Reading Guru's [Re: Torquemonster440] #2742445
02/12/20 10:34 PM
02/12/20 10:34 PM
Joined: Jan 2003
Posts: 19,304
Las Vegas
Al_Alguire Offline
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Al_Alguire  Offline
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Las Vegas
What fuel? Just a quickie id say its not lean honestly but need better pics of top and porcelain, also might change depending on fuel you use


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Spark plug Reading Guru's [Re: Al_Alguire] #2742447
02/12/20 10:48 PM
02/12/20 10:48 PM
Joined: May 2014
Posts: 179
California, U.S.A.
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Torquemonster440 Offline OP
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Torquemonster440  Offline OP
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California, U.S.A.
So Cal 91 swill.. Holley 9380 850dp.. jets square 78's all around [ factory baseline ]. 10.3-1 , Promaxx heads.. Eddie copies. Performer RPM.
Orange box.. timing is all in 37° @1900 rpm.

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Last edited by Torquemonster440; 02/12/20 11:32 PM.

1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
Re: Spark plug Reading Guru's [Re: Torquemonster440] #2742518
02/13/20 09:26 AM
02/13/20 09:26 AM
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usa
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lewtot184 Offline
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when i'm comparing heat range between different plugs I measure how far down the porcelain goes in the body of the plug before it bottoms out. the shallower the colder; the deeper the hotter. I always prefer the tip as far in the chamber as possible without any interference with the piston or valves. I always measure ohms resistance.

Re: Spark plug Reading Guru's [Re: lewtot184] #2742520
02/13/20 09:33 AM
02/13/20 09:33 AM
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California, U.S.A.
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Torquemonster440 Offline OP
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Originally Posted by lewtot184
when i'm comparing heat range between different plugs I measure how far down the porcelain goes in the body of the plug before it bottoms out. the shallower the colder; the deeper the hotter. I always prefer the tip as far in the chamber as possible without any interference with the piston or valves. I always measure ohms resistance.


Good info , thanks.. measure ohms from the plug tip to the electrode?

Last edited by Torquemonster440; 02/13/20 09:35 AM.

1966 Satellie.. 12.55 @107.75. 906 heads. 3780 lbs.
Re: Spark plug Reading Guru's [Re: Torquemonster440] #2742576
02/13/20 01:55 PM
02/13/20 01:55 PM
Joined: Aug 2003
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Bend,OR USA
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Cab_Burge Offline
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Cab_Burge  Offline
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Bend,OR USA
How much total timing does it have at WOT, also what is part throttle cruise timing?
I don't see any lines on the last plug on the ground strap for timing work
I like bright and clean on my plugs, not brown or black and with debris on them tsk twocents

Last edited by Cab_Burge; 02/13/20 01:55 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark plug Reading Guru's [Re: Torquemonster440] #2742578
02/13/20 02:06 PM
02/13/20 02:06 PM
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usa
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lewtot184 Offline
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usa
Originally Posted by Torquemonster440
Originally Posted by lewtot184
when i'm comparing heat range between different plugs I measure how far down the porcelain goes in the body of the plug before it bottoms out. the shallower the colder; the deeper the hotter. I always prefer the tip as far in the chamber as possible without any interference with the piston or valves. I always measure ohms resistance.


Good info , thanks.. measure ohms from the plug tip to the electrode?
yep. I've seen resistor plugs run anywhere from 3500 ohms to 15000+ ohms. some resistance in the secondary wiring is good but I try to avoid anything around 10,000 ohms for the plug and wire. capacitive discharge ignitions need some resistance, inductive ignition seems to be fine with less.

Re: Spark plug Reading Guru's [Re: lewtot184] #2743794
02/16/20 11:20 PM
02/16/20 11:20 PM
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
astjp2 Offline
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astjp2  Offline
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Utah and Alaska
Originally Posted by lewtot184
Originally Posted by Torquemonster440
Originally Posted by lewtot184
when i'm comparing heat range between different plugs I measure how far down the porcelain goes in the body of the plug before it bottoms out. the shallower the colder; the deeper the hotter. I always prefer the tip as far in the chamber as possible without any interference with the piston or valves. I always measure ohms resistance.


Good info , thanks.. measure ohms from the plug tip to the electrode?
yep. I've seen resistor plugs run anywhere from 3500 ohms to 15000+ ohms. some resistance in the secondary wiring is good but I try to avoid anything around 10,000 ohms for the plug and wire. capacitive discharge ignitions need some resistance, inductive ignition seems to be fine with less.


on a magneto, over 5k ohms is bad for the coils, so ohms do affect how the plug runs


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