Spark Plugs

[comet_666]

Hey everyone. Last year I noticed my plugs were getting a bit of carbon on them after only a few hundred miles. I am running NGK V power 8

I was told to maybe switch to NGK V power (7) because they are a bit hotter.


Thoughts?

Plug 1

[Draco]

   I have had better luck with AC plugs.

[Nacho-RT74]

usually the correct temp grade is 5 for NGKs on a stock BB

Last time I run my car ( allmost 4 years ago ) changed to 7 due pinging ( which found is not the reason, but bad quench on a stroked 400 ), but stockish is 5

[comet_666]

This is a 512 stroker.

[c00nhunterjoe]

What heads, cam, pistons are you running? What state are you in? How was that plug reading taken?

[comet_666]

Thanks for the reply guys!

I am running the following.

Edelbrock rpm Heads
Mahle Forged -8cc Flat Top Pistons
Howards Hyd Roller Cam 723445-10 Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,500-6,400
Intake Duration at 050 inch Lift: 235
Exhaust Duration at 050 inch Lift: 241
Duration at 050 inch Lift: 235 int./241 exh.
Advertised Intake Duration: 288
Advertised Exhaust Duration: 294
Advertised Duration: 288 int./294 exh.

I live in upstate NY
I noticed the reverse light lenses had a bit of soot on them so I removed the plugs and checked them, that is when I took the picture.
I texted my engine builder who told me try the 7's because they run a little hotter.

[cdr]

looks rich to me, BUT is it rich at idle,mid,or wot, or all ?

[PRH]

That combo looks more like about a "6" plug combo to me.

[comet_666]

I was thinking it might be running a bit rich as well. Maybe just at idle.
Everything runs fine, they just seemed dirty for having only about 500 miles which the builder agreed.

[BSB67]

Need to know the CR too, but a 6 or 7 is probably right.  My guess is it is fat too.  What carb and intake.  What is your idle quality, vacuum and rpm?

[comet_666]

Hi BSB67. thanks for the help as well. Forgive me by assuming the CR means compression ration, but if it is I believe that is 10:75:1
http://www.dodgecharger.com/forum/index.php/topic,124503.0.html
Edelbrock Intake rpm 7193
Carb Quick Fuel 850VS

Idles around 800 RPM and it seems to run great.
Not sure if it matters but it dyno'd at 580HP@5200/667TQ@3900


Thanks all!

[Draco]

    Is the plug number that you talking about NGK 6962 BKR6E?

[comet_666]

    Is the plug number that you talking about NGK 6962 BKR6E?

I am not sure what the current part # is but the ones I have to swap in are BKR7E (4644)

[Draco]

   Ok the number 7 is the heat range according to the NGK web page.

[Draco]

   So I decided to get a set of NGK plugs and now I thought I would check with Masters. I have a MSD-6L with a Blaster 2 coil and according to MSD I should gap the  plugs between 50 and 60. I had them set at 45 before and the old plugs did have some carbon build up. The motor is a 502 with Edelbrock heads 10.5  comp. Any thoughts on this would be great.

[68CoronetRT]

I run BKR6E's in my 440,Stealth Heads, !0:1 Comp, MSD 6AL, Blaster 2 coil, gapped at .038. Never had any kind of issues with the combustion. I'm also running Fitech so I can monitor my AFRs constantly.

[Draco]

    Thanks, I think .038 is a good starting point then after a hundred miles I will inspect them. See were I am from there.

[cdr]

This is what I run in my Stealths