Re: 500" R/B Total Advance Timing
[Re: madscientist]
#2564867
10/16/18 03:11 PM
10/16/18 03:11 PM
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Joined: Mar 2003
Posts: 1,453 N.W. INDIANA
moparjohn
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,453
N.W. INDIANA
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The C61CX is at the top of the heat range! They make a C63CX and it is at the top. They also make cooler C59CX, C57CX, C55CX and C53CX. I have attached a chart showing these numbers hot to cold. So my C61CX is one of the hottest heat cycle plugs. So now my question is how far to go down in heat range? Thanks! MJ
Last edited by moparjohn; 10/16/18 03:12 PM.
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564913
10/16/18 04:16 PM
10/16/18 04:16 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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I like NGK’s.
At 12:1 you’re in the -7 or -8 heat range(higher is colder).
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 500" R/B Total Advance Timing
[Re: fast68plymouth]
#2564919
10/16/18 04:28 PM
10/16/18 04:28 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
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State of confusion
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I like NGK’s.
At 12:1 you’re in the -7 or -8 heat range(higher is colder). I run NGK #8's at 12.1.1 comp and they last a long time on the street testing carbs and general cruising BUT my motor is in a pretty optimum tune verified by track times, afr's, plug readings and a good street tune before I hit the track. Plug looks glazed over which is as stated HOT combustion chambers weather too much timing, lean, too hot of plug etc...........Good luck...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564921
10/16/18 04:30 PM
10/16/18 04:30 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
Joined: Sep 2014
Posts: 4,457
Washington
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The C61CX is at the top of the heat range! They make a C63CX and it is at the top. They also make cooler C59CX, C57CX, C55CX and C53CX. I have attached a chart showing these numbers hot to cold. So my C61CX is one of the hottest heat cycle plugs. So now my question is how far to go down in heat range? Thanks! MJ Rule number one is NEVER use a cross reference for plug heat ranges. They are somewhat close approximations, but not good enough to use as a fool proof heat range indicator. Again, like I said, I don't think you need the cut back ground wire plug. At your compression ratio, you just don't need it. IMO, you'll be better off with an extended tip plug. The C65YC and the C65C are both two ranges hotter than what you are running. I'd have to look but I'd bet the plug that Porter just posted isn't a cutback ground wire plug. So as I said, I'd order the hotter plugs and start over after you verify TDC and your timing light. Don't be married to the CX plug. It may look cool but you just don't need it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2564926
10/16/18 04:33 PM
10/16/18 04:33 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Washington
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BTW, did you mention what ignition you have? That sort of greenish tint can be from a weak ignition.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 500" R/B Total Advance Timing
[Re: madscientist]
#2565128
10/16/18 11:08 PM
10/16/18 11:08 PM
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Joined: Mar 2003
Posts: 1,453 N.W. INDIANA
moparjohn
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pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,453
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BTW, did you mention what ignition you have? That sort of greenish tint can be from a weak ignition. The ignition is MSD all the way! MSD distributor, MSD coil and MSD coil wires. New cap and rotor also. MJ
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2565195
10/17/18 01:51 AM
10/17/18 01:51 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
Joined: Sep 2014
Posts: 4,457
Washington
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BTW, did you mention what ignition you have? That sort of greenish tint can be from a weak ignition. The ignition is MSD all the way! MSD distributor, MSD coil and MSD coil wires. New cap and rotor also. MJ Which MSD box? Like AndyF said many posts ago...your plugs look strange. At first look I thought they were too hot and reducing timing and adding fuel were keeping it from killing itself. Once we got deeper into it, it seems to me those plugs are plenty cold for what you are doing. That doesn't explain the green tint, what looks like a ton of heat and not being able to see a timing line on the ground wire. The insulator should be a dull white from the top down to the fuel ring. Most likely, you'll see some clouding on the porcelain from coming up the return road, especially if you don't run a power valve. The plugs look strange and your timing is also an anomaly.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 500" R/B Total Advance Timing
[Re: moparjohn]
#2565196
10/17/18 01:52 AM
10/17/18 01:52 AM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Is the ICU a 6,6A,6AL, 7AL2 or which MSD box are you firing the coil with and which coil are you using?
Last edited by Cab_Burge; 10/17/18 01:53 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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