Spark plugs for GN 1s

[007gn]

Hello everyone my question is whats The best spark plug to use for my GN1s that are fully race ported & will be run at @ 28lbs Of boost and what to gap them at. I'm using a 6870 Turbo with 93 n alky on my 4.1. Thanks guys

 

[BEATAV8]

Good features to look for:
gasketed plug. gasket plugs are easier on the threads compared to tapered seat plugs. important for aluminum heads.
non-projected tip. non projected tips help to avoid detonation
resistor style plug. resistor style plugs have low EMI and are less problematic on EFI cars.

I like the NGK 5430 but I also run E85. But there's no reason it wouldn't work well for gas and alky.

 

[bad V6]

I have been running the NGK 4554 up to 25# thus far with no issues.

 

[turbocamino1]

28 on the gap

 

[Major Nutz]

I run autolite 103's.

 

[Sinister CO]

I run autolite 103's.

Same here.

 

[forcefed3.8's]

I run ar3932 but these are non resistor plugs, and some have interference problems with them. Gapped out of the box, which is tight. Any plug on e85, i gap to .025.

 

[Silverttype1]

Autolite 104 tight gap .32

 

[Nick Micale]

...... important for aluminum heads.
non-projected tip. non projected tips help to avoid detonation...............

I know Champion recommended 103 plugs for their alum heads when they were first introduced, and this was before 109 builds were into the 9's yet.

With alky injection, and now e-85 is also common, my opinion is NOT to use any projected spark plug as this will become the hot spot at higher boost and RPM which can, and does, bring about pre-ignition which will instantly cause damage.

It may take 2 or 3 times at WOT before it actually becomes a complete disaster.

 

[TTA976]

I know Champion recommended 103 plugs for their alum heads when they were first introduced, and this was before 109 builds were into the 9's yet.

Understood

 

[Major Nutz]

Nick, thanks for the info. Definitely got me reconsidering my plug choice.

 

[whitehot1]

Nick, thanks for the info. Definitely got me reconsidering my plug choice.

Me too. I've always used projected plugs and never had any problems. But it's hard to argue with knowledge and reasoning that makes sense and backed with experience.

I just ordered a set of 8 NGK 4554 non projected plugs off ebay and they will be here before Friday and that works well for me since i'm doing some things on the car right now. The price of the plugs are less than 1/2 of what they cost in the auto parts stores and free shipping included plus no tax.

I'll run the plugs and see how they work out.

 

[whitehot1]

I received my NGK 4554 non projected plugs today. They all checked out ok with a visual inspection, all are pre gapped at .030''

Will be installing them shortly.

 

[TurboBob]

those are non-resistor plugs. let us know how they work for you.

Bob

 

[whitehot1]

those are non-resistor plugs. let us know how they work for you.

Bob

Yes they are. I will post how they work out.

 

[BEATAV8]

The NGK 5430 is the only resistor racing style plug I have been able to find.

If you find that you have loss of powerlogger connection when you build boost, try the 5430.

 

[TurboBob]

here is a link to a source. (no tb.com sponsors carry them, so I think its ok to post this.)

http://www.ninjaperformance.com/ngk-bcr8es-non-projected-tip-resistor-set-p-219374.html

not sure how many they stock, and I have no connection to them, I just found them after googling around for a while.

Bob

 

[vacuum 6]

I run ar3932 but these are non resistor plugs, and some have interference problems with them. Gapped out of the box, which is tight. Any plug on e85, i gap to .025.

I use the ar3933. I believe they are one range hotter from the 32s, out of box gap. I'm running 93 with 10% e85 mix and spraying alky.

 

[Heskahoka]

here is a link to a source. (no tb.com sponsors carry them, so I think its ok to post this.)

http://www.ninjaperformance.com/ngk-bcr8es-non-projected-tip-resistor-set-p-219374.html

not sure how many they stock, and I have no connection to them, I just found them after googling around for a while.

Bob

That is where I got my 5430s. That was the only place in the US I could find them. I wish a TB sponsor would carry some.

 

[BEATAV8]

They're on ebay too. Sometimes with free shipping.

http://www.ebay.com/itm/12x-NGK-SPA...296021?hash=item4ae9469195:g:PP4AAOSwNSxVQTtW

Just ordered another 12 pack for the shelf..... see what you guys made me do??