Nitrous Spark Plug help

Slow91 · Feb 16, 2020

Hello guys! I am pretty new to nitrous and need some input. Recently bought a 5.0 that Is running 150 shot of nitrous. Cars been running great, its just time to change the plugs. Car is a 306 built motor, aluminum heads, cam, etc. What plugs do you guys recommend? Talking to the previous owner, he said he couldn't remember what plugs were in it, and said it was gapped at .28. I feel that gap might be a little off? Car does run great though. Any information will help!

96pushrod · Feb 16, 2020

Well I guarantee the gap isn’t .280, as that is over a quarter inch. Probably more like .028, which is acceptable for nitrous. Should be able to get a little more gap with only a 150 shot though, but I wouldn’t push it if it runs well.

Without knowing the head, I’ll guess it takes something like an Autolite 3924 plug. I’d put an Autolite 3922 in there for nitrous, although it will want to foul a little quicker, If you’re not spraying.

Slow91 · Feb 16, 2020

Sorry, thats what I meant .028. The heads are Gt40X Aluminum heads. Are the 3922's considered a colder plug? Like I said I am new to this stuff.

srtthis · Feb 17, 2020

why not just pull a plug out and see what they are?

Gear grabber · Feb 17, 2020

In a nitrous application, I like a soft (NGK) non projected plug.
I use NGK R5671A-8 in the 150 -175 range.

srtthis · Feb 17, 2020

id also suggest running NGK over autolite...

you ever want to start leaning on the tune up you'll melt a piston before an autolite... but an NGK will melt before a piston

Slow91 · Feb 17, 2020

For some reason when looking up the spark plug it says it would not fit a 5.0. Is that incorrect? I used NGK R5671A-8 as the part number. Would there be any difference at all gapping the plug from .028 to .030? Or .028 to .035? Any information will be great! Thanks!

revhead347 · Feb 17, 2020

The early model GT40x heads use the same plug as a stock head. The later models us the Autolite 3924 plug (Autolite 3923). I run a 3924 with nitrous, it's fine. The NGK is a TR5 plug.

Kurt

srtthis · Feb 18, 2020

number 8s are way too cold

Slow91 · Feb 19, 2020

What NGK plugs to you guys run? A part number or link will help a lot!! Thanks.

General karthief · Feb 19, 2020

See post #5?

Slow91 · Feb 20, 2020

He just said #8 were way too cold?

General karthief · Feb 20, 2020

Then post #8

https://www.summitracing.com/parts/NGK-2238/

Gear grabber · Feb 20, 2020

Timing and plugs.

http://inductionsolutions.com/wp-content/uploads/2016/06/GTG3.pdf

revhead347 · Feb 20, 2020

Gear grabber said:
Timing and plugs.

http://inductionsolutions.com/wp-content/uploads/2016/06/GTG3.pdf

100 octane fuel for a 125 shot sounds way conservative to me.

Kurt

Gear grabber · Feb 21, 2020

It is conservative for sure,i have sprayed 190 on pump 93.
With C16 in the stand alone.

revhead347 · Feb 21, 2020

Gear grabber said:
It is conservative for sure,i have sprayed 190 on pump 93.
With C16 in the stand alone.

I've sprayed about 150 with 100% 93' Octane coming from the tank. No problem.

Kurt

srtthis · Feb 22, 2020

I sprayed 250 on straight 93..

Gear grabber · Feb 22, 2020

srtthis said:
I sprayed 250 on straight 93..

That is good news. My street car is taking a slightly more serious turn this winter.
BTE Top sportsman glide https://www.bteracing.com/products/BTE074473 (great Christmas sale)
Innovative PSN-1 https://www.innovatemotorsports.com/products/psn1.php
Looking to spray 225 ish.

revhead347 · Feb 22, 2020

srtthis said:
I sprayed 250 on straight 93..

How much timing did you have to pull?

Kurt

Nitrous Spark Plug help

New Member

I think they're a little easier to get off

New Member

the guy doing it does every local racers rear end

Well-Known Member

the guy doing it does every local racers rear end

New Member

Apparently my ex-husband made that mistake.

the guy doing it does every local racers rear end

New Member

wonder how much it would cost to ship you a pair

New Member

wonder how much it would cost to ship you a pair

Well-Known Member

Apparently my ex-husband made that mistake.

Well-Known Member

Apparently my ex-husband made that mistake.

the guy doing it does every local racers rear end

Well-Known Member

Apparently my ex-husband made that mistake.

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