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nitrous plug recommendation? #447557
08/23/09 09:58 PM 08/23/09 09:58 PM
Joined: Jan 2003
Posts: 642
South Dakota
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dakotahotrodder Offline OP
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South Dakota
What spark plugs do you guys use for a nitrous application on a 440 with edelbrock heads spraying around 150? I run Autolite 3923 in it normally. Thanks for the help.
Re: nitrous plug recommendation? [Re: dakotahotrodder] #447558
08/23/09 10:02 PM 08/23/09 10:02 PM
Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
8secDart Offline
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Salisbury North Carolina
You can go with 3932 or NGK 10s.The 10s are easy to read.I like 3932 but can be a pain to get a read on.

Last edited by 8secDart; 08/23/09 10:03 PM.
Re: nitrous plug recommendation? [Re: 8secDart] #447559
08/23/09 10:06 PM 08/23/09 10:06 PM
Joined: Jan 2003
Posts: 642
South Dakota
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dakotahotrodder Offline OP
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Ok thank you. What would you recommend the gap at ...035?
Re: nitrous plug recommendation? [Re: dakotahotrodder] #447560
08/23/09 10:14 PM 08/23/09 10:14 PM
Joined: Jul 2003
Posts: 977
Colorado
5
506RR Offline
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Colorado
For that combo I would use an NGK 9. A 10 will work, but is a little overkill for that combo. I say .030 for the gap on the plugs.

I run NGK 9's with a .030 gap on my 505 motor with ~165 HP shot, and they work great.
Re: nitrous plug recommendation? [Re: 506RR] #447561
08/23/09 10:28 PM 08/23/09 10:28 PM
Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
8secDart Offline
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Salisbury North Carolina
I agree the 9s are best,but if he's new to nos the 10s are safe.Plug gap 30 to 35 will work.
Re: nitrous plug recommendation? [Re: 8secDart] #447562
08/23/09 10:34 PM 08/23/09 10:34 PM
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Posts: 642
South Dakota
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dakotahotrodder Offline OP
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What is the actual part # of the NGK 9 or 10? I've never used that brand before. I used to use the kit a few years ago with a stock headed motor, but have only sprayed this motor a couple times when I first built it 4 years ago. On that day I ran a 11.33 n/a and with a 100 shot went 10.60. I didn't change plugs for that amount, just backed the timing down 5 degrees. Thanks for the help.
Re: nitrous plug recommendation? [Re: dakotahotrodder] #447563
08/23/09 11:05 PM 08/23/09 11:05 PM
Joined: Jul 2003
Posts: 977
Colorado
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506RR Offline
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Colorado
Here is the info for the "9" plugs:

R5671A-9
Stock No. 5238
Re: nitrous plug recommendation? [Re: 506RR] #447564
08/24/09 12:11 AM 08/24/09 12:11 AM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
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Central Valley, CA.
Quote:

Here is the info for the "9" plugs:

R5671A-9
Stock No. 5238



is that a projected tip or non projected tip plug?
Re: nitrous plug recommendation? [Re: Quicksilver440] #447565
08/24/09 12:42 AM 08/24/09 12:42 AM
Joined: Apr 2008
Posts: 6
peoria, az
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B1satellite Offline
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peoria, az
Most important what fuel and how much compression?
Re: nitrous plug recommendation? [Re: Quicksilver440] #447566
08/24/09 01:41 AM 08/24/09 01:41 AM
Joined: Nov 2004
Posts: 2,825
Sk. Canada
RemCharger Offline
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Sk. Canada
Quote:

Quote:

Here is the info for the "9" plugs:

R5671A-9
Stock No. 5238



is that a projected tip or non projected tip plug?

I believe the 71 's are non and the 72's are projected.
Re: nitrous plug recommendation? [Re: RemCharger] #447567
08/24/09 06:34 AM 08/24/09 06:34 AM
Joined: Jan 2003
Posts: 642
South Dakota
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dakotahotrodder Offline OP
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Thanks for the help everyone. The comp. is 10.7:1 and I will use Turbo blue 110 gas.
Re: nitrous plug recommendation? [Re: 8secDart] #447568
08/24/09 09:29 AM 08/24/09 09:29 AM
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann Offline
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Long Beach, CA
Quote:

I agree the 9s are best,but if he's new to nos the 10s are safe.Plug gap 30 to 35 will work.



If you miss your tuneup, you can take a strap out on a 9 without damaging the pistons for the most part. If you do this with a 10, the piston will be hurt.

0.02

8.30's @3400 lbs
Re: nitrous plug recommendation? [Re: Mike Swann] #447569
08/24/09 03:57 PM 08/24/09 03:57 PM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
I Live Here
Quicksilver440  Offline
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Posts: 10,766
Central Valley, CA.
Quote:

Quote:

I agree the 9s are best,but if he's new to nos the 10s are safe.Plug gap 30 to 35 will work.



If you miss your tuneup, you can take a strap out on a 9 without damaging the pistons for the most part. If you do this with a 10, the piston will be hurt.

0.02



Mike...why is this? Is it just because your tuneup would have to be off more to lose the strap on a 10..or?
Re: nitrous plug recommendation? [Re: Quicksilver440] #447570
08/24/09 04:12 PM 08/24/09 04:12 PM
Joined: Dec 2008
Posts: 1,200
UK
6
602heavy Offline
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UK
I ran that exact same combo hitting it with a 250 shot & a -8 NGK plug , As said before , the NGKs are a lot more forgiving if you loose a ground strap , i think a -10 will be overkill & confuse the tunning process.
Re: nitrous plug recommendation? [Re: Quicksilver440] #447571
08/24/09 09:52 PM 08/24/09 09:52 PM
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann Offline
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Mike Swann  Offline
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Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Quote:

Quote:

Quote:

I agree the 9s are best,but if he's new to nos the 10s are safe.Plug gap 30 to 35 will work.



If you miss your tuneup, you can take a strap out on a 9 without damaging the pistons for the most part. If you do this with a 10, the piston will be hurt.

0.02



Mike...why is this? Is it just because your tuneup would have to be off more to lose the strap on a 10..or?



You are trying sneak up on lean and "Goldilocks" timing. Doent matter if its fuel, N20 or Alcohol. This applies in So Cal weather too, cant say about back east.

If you nick a 9 (over) the piston is generally ok.

If you nick a 10, the piston has some damage. This is from personal experience because it is such a cold plug.

If you miss it by a mile, it doesnt matter.

BTW, this is some other mis-information in this thread too. Do not run big plug gaps.

8.30's @3400 lbs
Re: nitrous plug recommendation? [Re: Mike Swann] #447572
08/24/09 10:11 PM 08/24/09 10:11 PM
Joined: Dec 2004
Posts: 1,256
Salisbury North Carolina
8secDart Offline
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8secDart  Offline
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Posts: 1,256
Salisbury North Carolina
I agree 30 to 35 is wide.On his tune it should be fine.On some of my little motors the wide gap helps keep the plugs a little cleaner when not on the jug.

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