Recommended spark plugs?

Nixon1 · 12-16-2003, 11:29 AM

I need a new set of spark plugs... The Autolites I'm running right now have been fouled out from running pig rich due to poor AFPR adjustments, then lean due to MAF sensor problems.

What plugs would you guys recommend with my current mods? I'd like to stick to Autolites unless anyone knows of a better plug. I need a copper or something with a big electrode, since the car loses a tune very quickly, and I know how easy those platinums are to ruin.

Also, do you guys recommend any particular gap? I've just been using the factory gap.

Thanks.

b055 · 12-16-2003, 11:49 AM

ngk b9es possibly a 10 heat range if your na

PWR_RYD93 · 12-16-2003, 03:06 PM

Definitely Autolite 3924's.

USMC302 · 12-17-2003, 01:00 PM

Quote:

Autolite 3924's.

Yup that's what I use, but I will be trying the new...iridium plugs with the new 331 when it's complete

bigred90gt · 12-17-2003, 01:35 PM

Quote:

Originally posted by b055
ngk b9es possibly a 10 heat range if your na

I am all about the NGK plugs.

302 LX Eric · 12-17-2003, 04:14 PM

Another vote for the Autolites - 3924's for me.

E

Ieatcamaros · 12-17-2003, 05:42 PM

Autolites or motorcraft asf42c

b055 · 12-18-2003, 08:54 AM

autolites/motorcraft plugs are crap when u start making serious (600+hp) on spray! i've had too many to melt down to count. ac delco holds up a little better but by far the best has been the ngk's

302 LX Eric · 12-18-2003, 09:11 AM

Quote:

Originally posted by b055
autolites/motorcraft plugs are crap when u start making serious (600+hp) on spray! i've had too many to melt down to count. ac delco holds up a little better but by far the best has been the ngk's

Not many of us are making 600+ HP...

E

USMC302 · 12-18-2003, 09:24 AM

yet...

PWR_RYD93 · 12-18-2003, 09:45 AM

Quote:

Originally posted by b055
autolites/motorcraft plugs are crap when u start making serious (600+hp) on spray! i've had too many to melt down to count. ac delco holds up a little better but by far the best has been the ngk's

No flame intended: I understand that is your real world experience and that is fine. But that's an awfully general statement to make about those brand of plugs. I'm making over 600 HP and I never melt down my Autolite 3922 plugs with the correct tune. I have however melted down NGK's with a lean tune. And I would never put an AC Delco plug in my car

86GT · 12-18-2003, 10:21 AM

I run AC Delco R44XLS in my heads, on the 150 shot I run R43XLS. I've tried the champions, they didn't work so well, fouled out pretty quick. I've never tried Autolites, or NGKs, I was told that I needed NGK BCPR5ES for Edelbrock heads tho.

b055 · 12-18-2003, 11:16 AM

Quote:

No flame intended: I understand that is your real world experience and that is fine. But that's an awfully general statement to make about those brand of plugs. I'm making over 600 HP and I never melt down my Autolite 3922 plugs with the correct tune. I have however melted down NGK's with a lean tune. And I would never put an AC Delco plug in my car

no flame taken. i've melted down about every type of plug i've put in my car.. but only 2 ngk's EVER i just post my experience and let whoever buy whatever they want..

one of the ngk's i melted was on 13lb of boost run and 325 shot on top of that.

thats about double the 600hp mark mentioned before.

Nixon1 · 12-18-2003, 12:14 PM

Well what I'm basically looking for is a plug that'll last a good while, keep the car running nice and smooth, and not foul easily. Because the way the air temperature keeps changing (FL can't decide whether it wants to be winter or summer right now), I find myself tweaking with the AFPR fairly often....and as I mentioned earlier, I leaned the last set of plugs out, then richened the crap out of them. Now the car stumbles at idle...and it isn't from the cam because it never used to stumble idling at 1100 rpms. And it surges REAL bad too, but that's a separate problem I think that's usually started by running the a/c.

b055 · 12-18-2003, 12:20 PM

the ngk's will tend to outlast other plugs when going from one extreme to another.. IN MY OPINION.

jonnyk · 12-19-2003, 11:53 AM

Autolites for me also.
IMO if you are burning down plugs, your pistons aren't far behind.

PWR_RYD93 · 12-19-2003, 12:02 PM

I totally agree the NGK's are a great plug. Will they produce more power than an Autolite plug... I doubt it. Will they last longer... I bet they will. But I change plugs so often I never really wear a set of plugs out. At $0.89 per plug for Autolites I can justify changing them a couple of times per racing season. I guess that's all I'm trying to say.

b055 · 12-19-2003, 12:16 PM

Quote:

Originally posted by jonnyk
Autolites for me also.
IMO if you are burning down plugs, your pistons aren't far behind.

correct.. but have u ever tried to tune something over 1000hp? takes a few broke parts! unless u have unlimited access to a dyno or something simmilar.

if u doubt my hp claim... u figure it out. 5.6 in the 1/8th mile with me loosing .3 off the normal 60ft time due to traction.

jonnyk · 12-19-2003, 09:42 PM

Haven't played around at that level but you don't need a dyno to tune. Wideband O2's can be had for around $350, and EGT sensor setups for much cheaper. Both can be useful at the track also when the weather changes. I understand there is still a very small margin of error anyways

b055 · 12-20-2003, 01:59 PM

correct and i have access to a wideban but i'm no expert in tuning yet.. just a beginner.

if i had unlimited $$$ i'd just drop it off somewhere and have em to do it for me.. less headache. a guy can dream huh.

12-16-2003, 11:29 AM	#1
Nixon1 Registered Member Join Date: Jan 2003 Location: Palm Bay, FL Posts: 432	Recommended spark plugs? I need a new set of spark plugs... The Autolites I'm running right now have been fouled out from running pig rich due to poor AFPR adjustments, then lean due to MAF sensor problems. What plugs would you guys recommend with my current mods? I'd like to stick to Autolites unless anyone knows of a better plug. I need a copper or something with a big electrode, since the car loses a tune very quickly, and I know how easy those platinums are to ruin. Also, do you guys recommend any particular gap? I've just been using the factory gap. Thanks. __________________ '91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60'

12-16-2003, 11:49 AM	#2
b055 Registered Member Join Date: Mar 2003 Location: philadelphia ms Posts: 180	ngk b9es possibly a 10 heat range if your na __________________ i got mustangs. do u?

12-16-2003, 03:06 PM	#3
PWR_RYD93 Registered Member Join Date: Sep 1998 Location: IL Posts: 1,155	Definitely Autolite 3924's. __________________ Craig Supercharged 93 GT "I drive way too fast to worry about cholesterol!" Then I went to the doctor.... whoa 312! Hello Lipitor

12-17-2003, 04:14 PM	#6
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Another vote for the Autolites - 3924's for me. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

12-17-2003, 05:42 PM	#7
Ieatcamaros Domestic Rice really sucks! Join Date: Apr 2002 Location: KY Posts: 973	Autolites or motorcraft asf42c __________________ The sig says it all.

12-18-2003, 08:54 AM	#8
b055 Registered Member Join Date: Mar 2003 Location: philadelphia ms Posts: 180	autolites/motorcraft plugs are crap when u start making serious (600+hp) on spray! i've had too many to melt down to count. ac delco holds up a little better but by far the best has been the ngk's __________________ i got mustangs. do u?

12-18-2003, 09:24 AM	#10
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	yet... __________________

12-18-2003, 10:21 AM	#12
86GT Sniffed too much n20 Join Date: Oct 1998 Location: Ont, Canada Posts: 1,018	I run AC Delco R44XLS in my heads, on the 150 shot I run R43XLS. I've tried the champions, they didn't work so well, fouled out pretty quick. I've never tried Autolites, or NGKs, I was told that I needed NGK BCPR5ES for Edelbrock heads tho.

12-18-2003, 12:14 PM	#14
Nixon1 Registered Member Join Date: Jan 2003 Location: Palm Bay, FL Posts: 432	Well what I'm basically looking for is a plug that'll last a good while, keep the car running nice and smooth, and not foul easily. Because the way the air temperature keeps changing (FL can't decide whether it wants to be winter or summer right now), I find myself tweaking with the AFPR fairly often....and as I mentioned earlier, I leaned the last set of plugs out, then richened the crap out of them. Now the car stumbles at idle...and it isn't from the cam because it never used to stumble idling at 1100 rpms. And it surges REAL bad too, but that's a separate problem I think that's usually started by running the a/c. __________________ '91 Mustang GT 5.0 AOD Daily Driver Current stats: NEW 302 short block, E-303 cam (@.050, 220/220, .498/.498, 110 degrees), 1.6 roller rockers, Performer RPM heads (aluminum, 1.9/1.6, 60cc chambers), Cobra intake, Granatelli 75mm MAF, Billet AFPR, Equal-Length Shorty Headers, Off-Road X Pipe, Flowmasters, 4.10 POSI 13.73 at 103.8, ~2.2 60'

12-18-2003, 12:20 PM	#15
b055 Registered Member Join Date: Mar 2003 Location: philadelphia ms Posts: 180	the ngk's will tend to outlast other plugs when going from one extreme to another.. IN MY OPINION. __________________ i got mustangs. do u?

12-19-2003, 11:53 AM	#16
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	Autolites for me also. IMO if you are burning down plugs, your pistons aren't far behind. __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

12-19-2003, 12:02 PM	#17
PWR_RYD93 Registered Member Join Date: Sep 1998 Location: IL Posts: 1,155	I totally agree the NGK's are a great plug. Will they produce more power than an Autolite plug... I doubt it. Will they last longer... I bet they will. But I change plugs so often I never really wear a set of plugs out. At $0.89 per plug for Autolites I can justify changing them a couple of times per racing season. I guess that's all I'm trying to say. __________________ Craig Supercharged 93 GT "I drive way too fast to worry about cholesterol!" Then I went to the doctor.... whoa 312! Hello Lipitor

12-19-2003, 09:42 PM	#19
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	Haven't played around at that level but you don't need a dyno to tune. Wideband O2's can be had for around $350, and EGT sensor setups for much cheaper. Both can be useful at the track also when the weather changes. I understand there is still a very small margin of error anyways __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

12-20-2003, 01:59 PM	#20
b055 Registered Member Join Date: Mar 2003 Location: philadelphia ms Posts: 180	correct and i have access to a wideban but i'm no expert in tuning yet.. just a beginner. if i had unlimited $$$ i'd just drop it off somewhere and have em to do it for me.. less headache. a guy can dream huh. __________________ i got mustangs. do u?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Oh no mass air convers= no spark at plugs	drtbiker	Windsor Power	3	01-12-2008 05:48 AM
replaced spark plugs, now car runs like ****	cavdo	Modular Madness	10	12-31-2002 05:49 PM
Where the heck are the spark plugs at?	FivepointOH	Blue Oval Lounge	3	07-12-2002 06:57 PM
spark plugs	j's69stang	Classic Mustangs	1	09-17-2001 12:17 PM
Wrong spark plugs helping performance?	QuantumMotorsports	Windsor Power	4	01-18-2001 12:20 PM