Re: Spark plug images
[Re: justinp61]
#1637863
06/24/14 12:10 PM
06/24/14 12:10 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
super stock
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super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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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
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Re: Spark plug images
[Re: justinp61]
#1637865
06/24/14 12:38 PM
06/24/14 12:38 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
super stock
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super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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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
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Re: Spark plug images
[Re: slammedR/T]
#1637866
06/24/14 03:02 PM
06/24/14 03:02 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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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 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Spark plug images
[Re: sixpackgut]
#1637867
06/25/14 12:14 AM
06/25/14 12:14 AM
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Joined: Oct 2003
Posts: 11,685 W. Kentucky
justinp61
OP
I Live Here
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OP
I Live Here
Joined: Oct 2003
Posts: 11,685
W. Kentucky
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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 .
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Re: Spark plug images
[Re: Thumperdart]
#1637869
06/25/14 08:14 AM
06/25/14 08:14 AM
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Joined: Oct 2003
Posts: 11,685 W. Kentucky
justinp61
OP
I Live Here
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OP
I Live Here
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Posts: 11,685
W. Kentucky
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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.
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Re: Spark plug images
[Re: Thumperdart]
#1637870
06/25/14 08:27 AM
06/25/14 08:27 AM
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Joined: Jan 2003
Posts: 32,394
Quicktree
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I Win
Joined: Jan 2003
Posts: 32,394
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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?
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Re: Spark plug images
[Re: justinp61]
#1637873
06/25/14 11:22 AM
06/25/14 11:22 AM
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Joined: Nov 2003
Posts: 2,131 New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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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.
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
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Re: Spark plug images
[Re: justinp61]
#1637876
06/25/14 01:19 PM
06/25/14 01:19 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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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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