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Spark plug images #1637857
06/24/14 12:38 AM 06/24/14 12:38 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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Anyone seen the strap look like this?

8185879-smallIMG_0511.jpg (209 downloads)
Re: Spark plug images [Re: justinp61] #1637858
06/24/14 12:51 AM 06/24/14 12:51 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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These are out of my pump 93 10.9-1 408. I've taken the carb back to close to the original set up. At cruise, 3000 rpms the afr is 13.0-13.4. From a dead stop I pulled wide open to 6100 in high and the afr was 12.6-12.8 except when it was spinning in first and second gears until it hooked at 5200. When it was spinning the afr was 13.6-13.9. When it hooked the afr went to 12.4.

8185906-smallIMG_0509.jpg (142 downloads)
Re: Spark plug images [Re: justinp61] #1637859
06/24/14 12:53 AM 06/24/14 12:53 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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Last one.

8185915-smallIMG_0508.jpg (169 downloads)
Re: Spark plug images [Re: justinp61] #1637860
06/24/14 03:59 AM 06/24/14 03:59 AM
Joined: Aug 2003
Posts: 43,284
Bend,OR USA
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Cab_Burge Offline
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If those where brand new and you drove it a very short distance before taking these pictures I would try the next step colder plugs, maybe two steps colder and see how those look If those have been driven a lot longer than a short time definitely go to a colder plug

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Spark plug images [Re: Cab_Burge] #1637861
06/24/14 08:10 AM 06/24/14 08:10 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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Cab, they were new. I set the idle mixture and took it for a ride, probably four miles at the most. with the exception of the wide open blast most of the time was spent at 2800-3300,NGK 7s.
Re: Spark plug images [Re: justinp61] #1637862
06/24/14 08:19 AM 06/24/14 08:19 AM
Joined: Jan 2003
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Quicktree Offline
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plugs to hot and to lean, but if you didn't do a shut off pass it's hard to get a good read.

http://www.youtube.com/watch?v=fiMM2S0aADM
Re: Spark plug images [Re: justinp61] #1637863
06/24/14 12:10 PM 06/24/14 12:10 PM
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
slammedR/T Offline
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jacksonville,FLORIDA
I assume that is an extended reach plug in the zrf series? if so prolly try 4554 #8 race plug from NGK, they are cheaper at speed shops. $18.75 for a set of 8 here in jax at my speed shop I use.

2000 Dakota R/T, 408 magnum, 727, Indy heads
1000cfm 4150 carb, 93 octane fuel.
motor; 10.258 @ 132.78
200 shot; 9.262 @ 144.69
racemagnum
Re: Spark plug images [Re: slammedR/T] #1637864
06/24/14 12:33 PM 06/24/14 12:33 PM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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The plugs are BRK7E, #4644.
Re: Spark plug images [Re: justinp61] #1637865
06/24/14 12:38 PM 06/24/14 12:38 PM
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
slammedR/T Offline
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Quote:

The plugs are BRK7E, #4644.



OH, I didn't know the BRK's were also extened tip. anyway my 408 is at 10.5:1 compression and I run the 4554 plugs with no issue even on a 200 shot of juice.

2000 Dakota R/T, 408 magnum, 727, Indy heads
1000cfm 4150 carb, 93 octane fuel.
motor; 10.258 @ 132.78
200 shot; 9.262 @ 144.69
racemagnum
Re: Spark plug images [Re: slammedR/T] #1637866
06/24/14 03:02 PM 06/24/14 03:02 PM
Joined: Jun 2003
Posts: 9,225
Charleston
S
sixpackgut Offline
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Charleston
you need to take it to the track or a dyno and start jetting up then see what the AF meter says. don't go by that thing till you know what the engine wants. I wouldn't be buying plugs till you feel carb is tuned. I think -7 will be just fine. In my engine, those plugs would be way lean

Last edited by sixpackgut; 06/24/14 03:04 PM.
Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: Spark plug images [Re: sixpackgut] #1637867
06/25/14 12:14 AM 06/25/14 12:14 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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Today I jetted the primaries up two numbers and dropped the high speed bleeds two sizes and will drive it with the same plugs tomorrow afternoon when I get off work.

Thanks guys .
Re: Spark plug images [Re: justinp61] #1637868
06/25/14 01:01 AM 06/25/14 01:01 AM
Joined: Jul 2004
Posts: 19,318
State of confusion
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Thumperdart Offline
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Quote:

Today I jetted the primaries up two numbers and dropped the high speed bleeds two sizes and will drive it with the same plugs tomorrow afternoon when I get off work.

Thanks guys .




This may help based on the wide jet spread you`re running and those plugs aren`t too hot for your compression in my opinion since I ran em at 12.1.1 comp. but like the 8`s better now that the carb`s tuned. Measure your pvcr`s then that will help you determine the proper jet spread.................

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.....
Re: Spark plug images [Re: Thumperdart] #1637869
06/25/14 08:14 AM 06/25/14 08:14 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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Quote:

Measure your pvcr`s then that will help you determine the proper jet spread.................



I have a set of 1-60 and 61-80 drill bits on the way.
Re: Spark plug images [Re: Thumperdart] #1637870
06/25/14 08:27 AM 06/25/14 08:27 AM
Joined: Jan 2003
Posts: 32,394
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Quicktree Offline
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Quote:

Quote:

Today I jetted the primaries up two numbers and dropped the high speed bleeds two sizes and will drive it with the same plugs tomorrow afternoon when I get off work.

Thanks guys .




This may help based on the wide jet spread you`re running and those plugs aren`t too hot for your compression in my opinion since I ran em at 12.1.1 comp. but like the 8`s better now that the carb`s tuned. Measure your pvcr`s then that will help you determine the proper jet spread.................

really, what is the ground strap telling you?
Re: Spark plug images [Re: Quicktree] #1637871
06/25/14 09:23 AM 06/25/14 09:23 AM
Joined: Oct 2003
Posts: 11,685
W. Kentucky
justinp61 Offline OP
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really, what is the ground strap telling you?



I don't honestly know, that's why I posted the photos. I'll have to order a set of 8s.
Re: Spark plug images [Re: justinp61] #1637872
06/25/14 11:19 AM 06/25/14 11:19 AM
Joined: Aug 2009
Posts: 1,318
Ohio
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jlatessa Offline
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Here's some interesting info....


http://www.wallaceracing.com/plug-reading-lm.html

Joe
Re: Spark plug images [Re: justinp61] #1637873
06/25/14 11:22 AM 06/25/14 11:22 AM
Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon Offline
top fuel
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New Lenox IL
Quote:



really, what is the ground strap telling you?



I don't honestly know, that's why I posted the photos. I'll have to order a set of 8s.



I would say the strap is saying the temp in the chamber is high.
Needs more fuel, less timing or a combination of both.
Don

http://i131.photobucket.com/albums/p314/cudadon/BKD6_09_10_191A.jpg
Re: Spark plug images [Re: Quicktree] #1637874
06/25/14 12:40 PM 06/25/14 12:40 PM
Joined: Jul 2004
Posts: 19,318
State of confusion
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Thumperdart Offline
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Quote:

Quote:

Quote:

Today I jetted the primaries up two numbers and dropped the high speed bleeds two sizes and will drive it with the same plugs tomorrow afternoon when I get off work.

Thanks guys .




This may help based on the wide jet spread you`re running and those plugs aren`t too hot for your compression in my opinion since I ran em at 12.1.1 comp. but like the 8`s better now that the carb`s tuned. Measure your pvcr`s then that will help you determine the proper jet spread.................

really, what is the ground strap telling you?



Not clear enuff to read the strap but based on our phone conversations, he needs to measure the pvcr`s to get a feel for the jet spread cos a 12 spread and small pvcr`s could be creating the lean that I see.............but what do I know.

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.....
Re: Spark plug images [Re: Quicktree] #1637875
06/25/14 01:11 PM 06/25/14 01:11 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
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Quote:

plugs to hot and to lean, but if you didn't do a shut off pass it's hard to get a good read.

http://www.youtube.com/watch?v=fiMM2S0aADM

That's what I will be doing this Saturday at the track. Besides reading plugs, I temporarily mounted my camera so that I can record A/F and boost gauge readings at WOT.

8187250-datalogger1.jpg (45 downloads)
Fastest 300
Re: Spark plug images [Re: justinp61] #1637876
06/25/14 01:19 PM 06/25/14 01:19 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
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Quote:



really, what is the ground strap telling you?



I don't honestly know, that's why I posted the photos. I'll have to order a set of 8s.

go watch the video i posted and come back and report, the message is clear.
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