BAM92

What brand and part number are you guys running with the gasket type spark plugs with your AFR heads and F/I. Thanks...

Mo_Bandy

I'm using Iridiums NGK 2667 ...

Mo

BAM92

Thanks, I will give them a try.

BAM92

They should arrive Saturday Fed Ex. Kinda expensive at 71 shipped. Thanks again MO for the reply.

Mo_Bandy

Yeah I think I paid alittle over 8 bux a pop for mine too, but I have had them in almost a year with no problems

Your very welcome

MO

Brand-X

can you do me favor once you receive them? Measure how long they are from the gasket to the top of the tip where the boot goes--I tend to burn boots with long plugs.
thx
chris

lead foot 85 vet

chris.....I'm using the accel shortys 8198.......for header to plug boot clearence........with hooker supercomps and straight plugs it's still close......but better then beating a dent in the header.......they make quite a few differant heat ranges...........there about 1/2 inch shorter.


oppssss.......just read your looking for gasketed plugs........my bad........I believe they make those too but I wouldn't know the number.

BAM92

Should be here Saturday. Will measure them, no problem.

Brand-X

My number seven plug is EXTREMELY close to the header pipe. If I run a regular plug (standard length plug), I tend to burn the spark plug boot. There are two things I absolutely hate... burnt spark plug wires and valve cover leaks!!

AKS Racing

I have run many of the expensive brands, and have always had better performance with the side-cut regular plugs. Champion Racing 3923 works well with high cylinder pressures. ~$2/ea to boot.
Aaron

BLWN BUX

I know that many are using Rids and like them.

I had a bad experience. After viewing many posts I decided to try a set in my AFR 195's. I got a set of NGK's that would be equivlent to "Mo's"

The car ran fine for a few hundered miles. After that it started to progressivly run a bit weak under high boost. I thought it was just me.
I worsened to the point of a "POP" at higher RPM.

I was way scared. It happened like 3 different times. I thought it was a lean POP. I started doing data logging; nothing but I only have a left bank WBO2. thought a bad injector, or wire.

I finaly pulled the plugs for a read. Several of the plugs had evidence where the center trode was arking to the base instead of the ground strap

I re-installed a new set of AC as recomended from AFR's sight and it runs great.

BTW: I had the Rids gapped at 30

The darker area on the porcelane is where it was arking


[IMG]ttp://s178.photobucket.com/albums/w270/BLWNBUX/?action=view&current=IridPlugBurn.jpg[/IMG]

BLWN BUX

Mo_Bandy

Hmmmm wonder if I should pull my plugs and check, I'm not getting any popping, I you using water injection or just a intercooler?

Aaron, I agree with the AC's you were talking about I still have them as backups... I'm only hitting like 12 pounds , so i'm not probably hitting as much boost as you are..

Mo

BLWN BUX

I am just using water/alc 70/30 no IC.
Look at how dirty the plugs are. Also, the porcelane has erosion.

Non of my AC's look anything like this. Even after a lot more miles.

Chad

AKS Racing

My plugs look nothing like the plugs above. They are actually quite clean. I am now running at 0.031" and it seems to work well, following the switch to the large MSD coil (no more cylindrical MSD Blaster). I am running a large amount of xxOH/H2O injection.

I have also had fairly good luck with AC Delco plugs, but run the Champion Racing plugs in the AFR 215CPs.

Aaron

BAM92

2 1/16 from the tip to the gasket surface that mates with the head.

Brand-X

Thx!!
CT

tjwong

Aaron are you sure that isn't a Autolite AR3923 race plug? I can't seem to find that particular part number.

AKS Racing

You are correct in that they are Autolite plugs. I posted this same info in a post earlier this week.

I ran AR3910 plugs for a while, then switched to Autilite 3823, and have run Autolite 3923 plugs for the past 2-3 years. The AR3910 are plugs from Autolite's racing line, which means they come with the "cut back ground strap" and the requisite much higher price. The Autolite 3923 plugs are essentially the same except better under higher boost conditions, but the plugs' ground strap will have to be cut back manually.

If you found an AR3923, that means that it comes with the cut back electrode and the ~$8/ea price tag.

Sorry about the confusion.
Aaron

Widebody

Just an FYI, Jeg's carries the Autolite AR series for $2.99 per plug, and sparkplugs.com has them for $3.54 per plug. Supposedly the plain 3923 and 3924 have been replaced by ar3923 and ar3924 respectively. Summit's price for the plugs is about the same as Jegs if I remember right. Autolites website still shows the plain 3923/3924 so either will work if you want to cut back the electrode on the standard plug.