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plug fouling #2785232
06/14/20 07:03 AM
06/14/20 07:03 AM
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nj pine beach
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dart9ss Offline OP
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nj pine beach
I run NGK R5671A-9 & 8s in my Indy headed race engine. 14 -1 compression. What happens is After a race day when I restart the engine next time out at least the 4 corner plugs are fouled. this has been a constant thing. I think this is all from start up . I run an old 1050 8896 dominator . The car runs and idles great. It will restart after warm up with just cranking the motor no fuel required. Any thoughts, ???

Re: plug fouling [Re: dart9ss] #2785236
06/14/20 07:31 AM
06/14/20 07:31 AM
Joined: Jan 2003
Posts: 3,830
N.E. Ohio
6bblFLASH Offline
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N.E. Ohio
Rich idle wet plenum floor. Fuel is trickling out to the 4 corners.
Shut off the fuel pump and let it run till it starts to die and see if it stops fouling plugs


70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
Re: plug fouling [Re: dart9ss] #2785237
06/14/20 07:32 AM
06/14/20 07:32 AM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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Romeo MI
Originally Posted by dart9ss
I run NGK R5671A-9 & 8s in my Indy headed race engine. 14 -1 compression. What happens is After a race day when I restart the engine next time out at least the 4 corner plugs are fouled. this has been a constant thing. I think this is all from start up . I run an old 1050 8896 dominator . The car runs and idles great. It will restart after warm up with just cranking the motor no fuel required. Any thoughts, ???


Sounds like a distribution thing in the manifold.. you could put in 8 EGTs and find out I ran 8 of the EGTs
in a few of my engines
wave

Re: plug fouling [Re: dart9ss] #2785308
06/14/20 11:05 AM
06/14/20 11:05 AM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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I’d start out by putting a kit in the carb.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: plug fouling [Re: fast68plymouth] #2785387
06/14/20 01:55 PM
06/14/20 01:55 PM
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usa
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lewtot184 Offline
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single plane intakes can have a distribution issue with the outer cylinders burning different than the inners.

Re: plug fouling [Re: lewtot184] #2785506
06/14/20 08:15 PM
06/14/20 08:15 PM
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Posts: 361
nj pine beach
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dart9ss Offline OP
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thanks all , I'm eyeing up a gen 3 to replace the old 1050'

Re: plug fouling [Re: dart9ss] #2785548
06/14/20 10:21 PM
06/14/20 10:21 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
I've tried and ran a bunch of the early non HP 1050 dominator on a single four single plane intake for bracket racing, the #9375 is the best one I've found for best performance out of the box with stock jetting, the one you have now was not so great down
Contact Dominic, ThumperDart on here, for a custom built state of the art race carb for your motor twocents up scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: plug fouling [Re: dart9ss] #2785665
06/15/20 12:00 PM
06/15/20 12:00 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
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Thumperdart Offline
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I can put you in a top shelf billet bad dog for a few bucks more than the cast stuff and all I build are 2-circuits w/ one of my customers going a 1.06 60 ft. and 4.70's in the 1/8.....one of many I've done....


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: plug fouling [Re: Thumperdart] #2785681
06/15/20 12:27 PM
06/15/20 12:27 PM
Joined: May 2004
Posts: 12,379
Taxes & Virus's R-US, NY
Dragula Offline
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Taxes & Virus's R-US, NY
I will put this out there, as it was my experience with NGK plugs a while back......I have used them from daily driver to bracket racing and even N2O racing......My experience was when they saw too much fuel, they just plain quit. Like the added resistance to light the fuel some how made the box put out a little more juice to light them, and it burned out somthing in the plug...Mine would not come back. And like you, it was generally the same plug positions over and over. I really hated those things when I figured it out. I have tried a lot of plugs since then.....

My favorite now is the Autolite Racing Plugs AR3935 (I think thats the number) I love those things. Season after season, no issues. Fire the car in the dead of winter, fuel puddling all over the place...still lights....Now those are like an NGK7 I think, but they make an AR3934 which is an NGK8 equivalent if I remember right.

I used to buy three sets a year.....Now, I buy one set, and it lasts me two years.

I would [censored] can the plugs and try a set of these.

Last edited by Dragula; 06/15/20 12:29 PM.

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk
Re: plug fouling [Re: Dragula] #2785689
06/15/20 12:46 PM
06/15/20 12:46 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
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Thumperdart Offline
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And I had negative issues w/Autolite but a super rich mixture will kill any plug cos it's all in the tune and my plugs live and look great after months of street driving which is WAY more critical than race only....


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: plug fouling [Re: Dragula] #2785818
06/15/20 07:05 PM
06/15/20 07:05 PM
Joined: May 2006
Posts: 739
WA
JD Dart Offline
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WA
What I didn't like about the Autolite Racing Plugs AR3935 it would 60' better with them but mph less weird but that was the results I had.


best so far 8.53 @ 158.59 MPH 60'1.240






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