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The best Spark Plug for Forced Induction

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Old 06-19-2016, 01:39 PM
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Default The best Spark Plug for Forced Induction

I have run ACs which I have had great success with, and NGKs which worked fine.
I have a fresh Procharger F-1 build in the works and want the best plugs.
Which plugs do you think are best out there these days?
Old 06-19-2016, 02:23 PM
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I always run ngk and nothing else but that's just me. the type of plug you'll need all depends on your boost level. for anything over 10 lbs I've been running br7ef with good results. plug gap can be just as important as well... some others will likely chime in with other experience
Old 06-19-2016, 02:33 PM
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Br7efs

Comes down to how crazy you're getting with it at the end of the day.
Old 06-19-2016, 04:15 PM
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What is your definition of best ?

Given that could mean anything from a $2 plug to a $100 plug

And the reality is that cheap $2 will work perfectly fine for almost every user.
Old 06-20-2016, 03:18 PM
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Thanks for the responses. I agree about the cost of the plugs. I love the ACs and they are very well priced. The NGKs are a little more, but have had equal success. I am planning on boosting well above 10psi. Old legendary school tuner and car guy Ed Wright out of Tulsa tuned my first motor till issues stopped us and I had to get back to sacramento, CA. I want to say the NGKs are 8s, but I will have to look again. I am running a LSX 434 with a Procharger F1-C Bell intercooled with 4" lines. Looking to hit 1100hp at the flywheel.
Old 06-20-2016, 03:36 PM
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for high boost high hp motors, what gap do you suggest? I also have been told to clock the plug so that the ground electrode down leg is pointing towards the intake valve to help prevent high boost charges from blowing out the spark, if that makes sense since it is on the backside of the compression stroke.
Old 06-20-2016, 06:56 PM
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Just bought these for $19
http://m.ebay.com/itm/8-pc-8-x-NGK-V-Power-Plug-Spark-Plugs-3346-BR7EF-3346-BR7EF-Tune-Up-Kit-Set-nl-/121876700514?txnId=1648193084002
Old 06-20-2016, 08:50 PM
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NGK R5671a-10

Last edited by scottywheels; 06-23-2016 at 09:37 PM.
Old 06-20-2016, 11:02 PM
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Originally Posted by scottywheels
NGK 5671a-10
Ive never seen that plug before what were you using before and how do they compare
Old 06-21-2016, 11:10 AM
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Careful with those Ebay plugs slamdik, lots of Chinese rip-offs of so many parts these days. The ole' Chinese proverb..."if it is too good to be true, it probably is."
Unless the parts are coming from a reputable source of-course.


Is3fox, those are non-resistor racing plugs, how are they on the street?
Old 06-21-2016, 11:21 AM
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I have no idea ive never tried them i was asking scottywheels
Old 06-21-2016, 01:18 PM
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https://sites.google.com/site/sloppy...ls/spark-plugs
The following users liked this post:
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Old 06-22-2016, 11:18 AM
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Next we can talk about which oil is best for forced induction engines! lol
Old 06-23-2016, 09:36 PM
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Originally Posted by ls3fox
Ive never seen that plug before what were you using before and how do they compare
at lower boost I ran NGk R5671A-9


http://www.sixityauto.com/8-pc-8-x-n...FcNahgodhFsBmQ



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