4.7L spark plugs [Archive] - Dodge Durango Forum

: 4.7L spark plugs


jdc1422
11-09-2003, 03:02 AM
Computer at store said to use Autolite 3924 plugs. All I see on the web is to use 3923 or 5224...no mention of 3924. Any help would be appreciated. Thanks!

SSRage
11-09-2003, 03:07 AM
Go to the Performance Page (http://www.dakota-durango.com/performancetips.html) and scroll down to the Alternative Spark Plug section and read what is there. It is a good explanation of the reasoning behind going with the 3923's. I installed the 3923's in my truck and noticed that mine idled a little smoother and I actually noticed a small increase in mpg.

J Banning
11-09-2003, 04:56 PM
Originally posted by jdc1422
Computer at store said to use Autolite 3924 plugs. All I see on the web is to use 3923 or 5224...no mention of 3924. Any help would be appreciated. Thanks!

I just did this yesterday. Went to sparkplugs.com and looked up the 4.7 Durango specific offerings...

http://sparkplugs.com/results_app.asp?productTypeID=1&AAIA=1361821

I then went to my local auto parts store and got the NGK V-Power ZFR6F-11G

mrbaddakota
11-16-2003, 04:06 AM
Don't use Autolites. I just took out a set and after only 18,000 miles they were shot. I went to the Champion Truck plug and picked back up the 3 MPG I lost with the Autolites.

I never dreamed I would be telling someone not to buy Autolites I have used them in my Ford for years.

SSRage
11-16-2003, 05:32 AM
Huh... you got me curious now cuz I have 15k on mine and my mpg is dropping slowly. Have to pop mine out and check them

mrbaddakota
11-17-2003, 04:58 AM
My plug gaps varied from .045-.050, the tips were rounding and looked burnt, porcelain was white.

dvsone
11-26-2003, 09:03 PM
lol So which spark plug is good to go with as I am gonna change mine tommorrow?

SSRage
11-26-2003, 09:28 PM
I guess take your pick. I'm a little leary of the Autolites now... had them in my truck for almost 17k miles now and I have lost almost 2 miles to the gallon. My driving habits haven't changed either so... I am going to pull mine out this weekend and check them.

mrbaddakota
11-27-2003, 03:17 AM
I went with the Champion Truck Plug and picked back up not only my lost milage but the lost power. We'll see how these do the OEM plugs which were Champoins went 30,000 no problem.

SSRage
11-27-2003, 03:47 AM
Originally posted by mrbaddakota
I went with the Champion Truck Plug and picked back up not only my lost milage but the lost power. We'll see how these do the OEM plugs which were Champoins went 30,000 no problem.

Hey, MrBad do you remember what the part number was for those plugs? Give me something to do tomorrow before we partake of the beverages and plentiful bounty of food.

mrbaddakota
11-29-2003, 05:07 AM
Don't have the numbers of the plugs. I just went to my local parts house and they looked them up I got the stock plug for my app. I have been really surprised at how much better they are, we just returned from a 600 mile trip for thanksgiving and we got alittle better mileage than we ever had, 16.8-16.9., 16.5-16.7 before. We have a 4x4.

SSRage
11-29-2003, 06:13 AM
I pulled my plugs out yesterday and they still looked brand new. so I don't know whats up with mine. Guess I better just keep my foot out of it.

LeeGWU
12-01-2003, 05:30 PM
Has anyone underwent an emissions test with 3923 installed?

Is it known if the lower temp plug will allow the engine to pass an emissions test?

mrbaddakota
12-02-2003, 02:55 AM
Can't answer your question, Sorry. SS, I was thinking could your plugs be breaking down under load, but not enough to cause a miss? I remember when I was a kid I worked in a gas station, and my boss had a spark plug cleaner- tester, you could clean a plug then hook it up to a plug wire there was a button on the side and you could see how the plug was firing, as I remember you could adjust air to simulate loads, as I remember plugs could fire good under Low loads and start missing under heavy loads, and alot of times we had plugs like that that you couldn't hear or feel a miss.

Just a thought I wanted to share.

SSRage
12-02-2003, 04:26 AM
Huh, point taken. I hadn't thought about that. Considering its only gonna cost about 10 bux and 1 hours worth of time I think I will change em out anyway. Thanks for the idea, MrBad.

AAR Kota
12-02-2003, 07:43 AM
i did an smog test last month with the autolites 3923s and had no problems at all.theyve been in there at least six monthsand i get about 18 mpg on long trips, dont know in the city.

mrbaddakota
12-02-2003, 10:07 PM
SS, Let me know what happens, I noticed a difference right away when I put in the Champion Truck plugs. When I think about it .005 in gap is not that much in my case.

dvsone
12-03-2003, 02:18 AM
I think ill try the champ plugs this week

JST2SIC
12-09-2003, 05:29 PM
how tight do you all tighten the spark plugs? I stripped one and I don't want to do it again. the book says 20 ft. lbs I think thats to much.

mrbaddakota
12-10-2003, 06:29 AM
I just go by feel myself, but keep in mind I made my living as a mechanic. Dodge does say 20 FT/LB if in doubt I'd go with the torque specs.

vrman
12-12-2003, 05:31 PM
Hi all!
It was my understanding, when I first ran across the references at the DML that the 3923 needed to be changed every 10K miles. At least that's what I've been doing at haven't experienced any mpg loss. Heck, for as cheap as they are compared to the ones the dealer wants to put in, it's worth it!!

Phil
2000 4x4 CC 4.7L

mrbaddakota
12-13-2003, 12:42 AM
I'm not sure about that, but what I'm sure of is if I have to change plugs every 10,000 miles I will be selling this DODGE and go back to a FORD. That's crazy I got over 10,000 miles out of a set of plugs street racing my 56 FORD post with a built 312, in 1967.

jdc1422
12-22-2003, 06:26 PM
Thanks all. I just pulled my original Champions with 45k on them and they were shot.....but what a pain in the ass changing out plugs 2 & 3 under metal A/C tubes. Getting air intake body off was also a big prob for me.....any hints on how to make it easier.

mrbaddakota
12-23-2003, 03:23 AM
I think the tubes that are in your way are heater tubes. and if you look closely you will see they unclip allowing you to move them out of your way. As for the intake box there are two bolts and two hose clamps, if I remember correctly I found it easier to put the inner rubber on the throttle body then install the intake box. Hope this helps.

ballz3
01-27-2004, 10:19 PM
well, as you all have stated, I too have read a lot about the autolite 3923's. Is the general consensus now to go with the champions? I have stock plugs in mine, I believe, and I get pretty bad mileage, but I also have 60k miles on it. (i just bought the truck this month, so I assume they are stock plug).

I am installing my 360airintakez soon, so I might as well change the plugs while I have it off.

thanks!

SSRage
01-27-2004, 10:26 PM
Ballz... hehe i said ballz... sorry I'm high on pain killers. I am not happy at all with my Autolites. I am going to swap mine out with either the NGK's or the Champions when it gets warmer.

ballz3
01-28-2004, 03:08 AM
i am leaning towards these. on that site some one posted, sparkplugs.com, they have 3 stages of quality. does every one go with the best in there? the highest ones on there are about $4-$5 each. are those the best to get?

thanks


maybe even a good model number will help me out ;)

SSRage
01-28-2004, 04:03 AM
I'm a cheapskate and thinkin more along the lines of the $2 per pair. Otherwise your lookin at $40 to change your sparkplugs.

ballz3
01-28-2004, 01:44 PM
thanks for your help. i just wanted to make sure i wouldn't get terrible perfomance with the lower quality ones. if the lower quality will still be better than your experiences with the autolites, they are worth getting.

thanks again!

dvsone
01-29-2004, 04:16 AM
I got the bosch platinum and they seem to be doing good

ballz3
02-04-2004, 06:51 PM
Hey all,

I bought the Champion 7071 yesterday (they didnt have NGK, and only some basic other plugs) and will be putting them in today. I will let you know how it goes!

They were like $4.80 per plug, but i think it will help with my gas mileage, so will see how worth it they are.

thanks for the help!

~harry

mrbaddakota
02-07-2004, 01:58 AM
So far I have no complains with the Champions I put in my wifes truck, the test for me will be about 25,000 mile.

tiggerweed
02-07-2004, 03:35 AM
I'm running the Bosch Platnium +2 and they work just fine. I got a Durango with a 318 and get about 16mpg and i drive fast

mrbaddakota
02-07-2004, 09:32 PM
I'm so sick of this Dakota of my wifes that today I spent this morning at the Chevy dealers talking about a half ton chevy 4x4. I have three friends with Chevys with 5.3s that get 18mpg easy. and have more room more hauling and just better satifaction. My last Chevy Truck when 340,000 miles with little problem and got 14 mpg in 1979. The guys with Chevys I talk to here in the Vegas area don,t know about spark plugs unless they have around 100,000 miles. I get 10-13 mpg out of my 86 F250 4x4 with a 460 & C-6, and to drive a newer truck and get 2 more mile per gallon is sad, and I am quiet sure these Dodges will not hang with my 460.

DakIsBackJack
02-08-2004, 05:13 AM
Go wit Platnums for a little bit more performance, just a thought :mullet:

mrbaddakota
02-08-2004, 10:38 PM
Thanks for the insight. Yesterday I decided that my wifes Dakota is going good-bye, I'm working on setting her into a Ford or Chevy. This Dodge is the worst truck I have owned. This was the first Dodge I have ever bought and it will be the last. Brakes are going again 67,000 miles.

DakIsBackJack
02-08-2004, 11:28 PM
Ok, Good Luck and Godspeed with a chevy peice of sh#t, the cities of bowie uses chevys are they out right suck

SSRage
02-09-2004, 02:27 AM
Get her a new F150... least you would like it. Get the harley supercrew edition... those are fun!

Crashyyz
02-09-2004, 06:21 AM
platinums are NOT recommended in the 4.7L

I've used.. NGK V-POWER ZRF5F-11 (2262)... Kenne-Bell known for their supercharger, did massive research and dyno's and stated that these NGK 2262 are an excellent plugs for our Dodge engines

hey they're even recommended on the Viper.. so they can't be all that bad... :D

LeeGWU
02-09-2004, 02:14 PM
I began running the NGK Iridium IX [ZFR6FIX-11] a couple of weeks ago.

Does anyone have any experience with these plugs in the 4.7L engine?

Crashyyz -- do you know if these plugs show on a "NOT recommended list"?

Crashyyz
02-09-2004, 11:13 PM
Hey Lee.. hmm.. are they a new model? .. I've never even heard of the Iridium IX

As for the platinum plugs... any brand...

The power packs (aka coil packs) on the plugs don't produce enough current for platinum. By using them it will cause damage to the motor.. improper spark means poor combustion in the cylinders.

LeeGWU
02-10-2004, 01:03 AM
Check out

http://www.ngksparkplugs.com/products/cars_trucks_suvs/iridiumix.asp?nav=11420&country=US

Since you said the power packs do not produce enough current for Platinum -- Iridium may be okay. The URL claims they require less voltage.

SSRage
02-17-2004, 07:18 PM
http://www.ngksparkplugs.com/apps/car_truck_suv/results.asp

I installed the NGK V-Power ZFR6F-11G (6987) on Sunday. Noticed a difference right off. The truck for awhile has lugged coming off idle and with the new plugs thats went away. Its also smoothed out while idling in gear. In one tank I've went from 13.1 to 15.3 mpg driving the same as always. Thats what its supposed to be for me. When I pulled the old Autolites out they were starting to foul out and the electrode was domed and corroded instead of clean and flat. Not to mention some of them looked like they had dirt in them. Course that was from the stupid dealer. Some of you know that story. Oh well real happy with the NGK's. They were $1.89 at PepBoys.

ballz3
02-17-2004, 08:28 PM
I put my Champions in the other day and haven't noticed any difference in MPG. I have noticed a smoother, easier start, but that's about it so far. The plugs should last a while though...they are double platinum. The old plugs were pretty nasty and worn.

SSRage
02-18-2004, 04:41 AM
umm thats odd I posted a reply and it just now popped up like 4 hours later. love computers.

mjmcneese
03-02-2004, 08:19 PM
I've had the Champ 4071 in for about two months now. I wanted to get the 7071, but the guy at AutoZone also has a D and said that the 4071s were the way to go. Low and behold, my MPG went from 14 to 17 hwy, and the idle is a bunch smoother.

walley10
03-23-2004, 12:37 AM
My '01 4x4 QC has just over 50K on the clock, original plugs, and still getting 16.5mpg avg. - has gotten 19 (it's a 5spd) - the manual says that 60k is when plugs are to be changed. After reading all of these threads, which of the discussed plugs is considered to be the favorite? I've always run Champions in nearly all of my vehicles (I've had more than 30 at this point) and have found them to be good long running plugs.

Also, since I'm fairly new with these computer controlled engines, is there anything that needs to be done after the plugs are installed, or do you let the computer make whatever adjustments?

SSRage
03-23-2004, 03:33 AM
I thought that I originally liked the Autolites but after 18,000 miles they went to crap. I've had the NGK's in for 2,000 miles now and they are doing just fine. Part of it is personal preferences to what you are looking for. I like the NGK's and Champion's personally. Stay away from the platinum plugs for our trucks. They aren't recomended at all. Platinum breaks down under a very high current. The coil pack setup that our motors use produces a very high current compared to the old single coil style setups. I picked up the NGK's (listed in my sig) at Pep Boys for $1.98.

cpa7man
03-23-2004, 04:33 AM
Wow how confusing can buying spark plugs get!:confused:

NGK V-POWER ZFR5F-11 (2262) Per Crashyyz
NGK V-Power ZFR6F-11G (6987) Per SSRage
Champion 4071 Per mjmcneese

Refering to this web site:http://sparkplugs.com/results_app.asp?productTypeID=1&AAIA=1361821

None of these plugs are listed in the premium class, the 4071's are listed in the super class.
SSrage your plugs 6987 are in the regular class.
So were saying don't go with an NGK 3271 double platinum and go with the 6987, they will perform better in the 4.7 due to extreme voltage. :confused:

What are the oem plugs that are supposed to last 60k?:)

SSRage
03-23-2004, 11:44 AM
Originally posted by cpa7man
Wow how confusing can buying spark plugs get!:confused:

NGK V-POWER ZFR5F-11 (2262) Per Crashyyz
NGK V-Power ZFR6F-11G (6987) Per SSRage
Champion 4071 Per mjmcneese

What are the oem plugs that are supposed to last 60k?:)

OEM plugs are just regular champion truck plugs. Crashyyz is running basically the same plug as me its just one heat range colder than mine. The spark isn't quite as hot. Helps kill some of the pinging. And yes stay away from the platinum. You can go with the NGK Iridiums but they are like $6.95 a piece. Too rich for my blood. Now if I can ever get about $12k up I put dual turbos on my 4.7L run something totally wild and then will blow $6.95 on plugs cuz I'll have too. Until then to me its pointless to spend more than $2 a plug when its only gonna make a minute difference in performance that we won't even feel.

2000Quad
03-06-2007, 09:56 PM
any new opinions on the NGK Iridium?

Geoguy
03-07-2007, 02:29 PM
any new opinions on the NGK Iridium?

I installed a set (NGK ZFR6FIX-11) in my 4.7L Quad Cab last month (only about 1,200 miles on them so far). I know many of the guys on this forum warned me not to waste my money on these plugs but they just look so sexy with that pointed center electrode - like a little lightening rod. I changed plugs because I was seeing a decrease in gas mileage over the past few months. The Autolites I replaced only had 17,500 miles on them and they looked fine, but I've burned four tanks of gas and seen an increase in mileage (one to two mpg) with the new NGKs. The truck runs great! Although, it ran great with the old Autolites and the factory Champions before that.

So,,, opinions,,,,,,, I likem', so far. Worth the extra money?,,,, maybe not, but I likem'. :onethumb:

2000Quad
03-07-2007, 03:12 PM
i already ordered the iridiums but i haven't picked them up yet and i'm trying to decide if i want to see how difficult it would be to swap those for the Vpowers or just go ahead and buy these

Khyren
03-15-2007, 02:30 AM
It will take me more time than what I have spent looking through this post, but Imy truck had 178k on the stock champion plugs and looked like the ones linked. I replaced them with some bosch single plats gapped at .040 and I already hate them as powe is down and I get ping. The worst stock plug's gap was .087. Pretty damn impressive if you ask me.

Khyren
http://i86.photobucket.com/albums/k119/kilgree/oldplugs.jpg

Mopar Mike
03-15-2007, 11:55 PM
Go wit Platnums for a little bit more performance, just a thought :mullet:Platinum plugs will not increase performance, nor are they recommended for this engine. The only purpose for platinum is increased durability.

As long as the heat range is the same, a spark is a spark. It doesn't matter what brand of plugs you install, the end result will be identical.

2000Quad
03-24-2007, 12:30 AM
Platinum plugs will not increase performance, nor are they recommended for this engine. The only purpose for platinum is increased durability.

As long as the heat range is the same, a spark is a spark. It doesn't matter what brand of plugs you install, the end result will be identical.


Don't know if i agree with that at all....when i worked for Honda you could put a champion or autolite in there and just listen to the rough idle...put a NGK or a Denso iridium in there and it was smooth as butter....




also what's the easiest way to get to the 2 plugs under the piping?

Anthony
03-24-2007, 01:02 AM
also what's the easiest way to get to the 2 plugs under the piping?


you need to remove the 2 bolts holding down the heater lines and push them a side to get access to the 2 plugs.

2000Quad
03-24-2007, 01:26 AM
aight i think i am gonna try this tomorrow

Matts00SLT
03-24-2007, 01:30 AM
aight i think i am gonna try this tomorrow

i just did mine today its a piece of cake to do them and very easy to get around those 2 lines i think at most took me an hr but i wasnt watching the time

DocZ
03-24-2007, 01:50 AM
I just did mine last weekend , it was a breeze.
I moved the pipes, pulled the little plastic brackets that hold them.
then took all the coils out. I was careful to used compressed air with a long wand on blower to blow dust/dirt out from around plugs before removing them.
Mine had 37k miles and I replaced with Bosch platinums, it starts a bit quicker and idles much smoother.
http://i89.photobucket.com/albums/k220/DocZ_2006/Dodge/PlugG_9711.jpg

viperkota
03-24-2007, 08:11 AM
platinums are NOT recommended in the 4.7L

I've used.. NGK V-POWER ZRF5F-11 (2262)... Kenne-Bell known for their supercharger, did massive research and dyno's and stated that these NGK 2262 are an excellent plugs for our Dodge engines

hey they're even recommended on the Viper.. so they can't be all that bad... :D
actually on that HO plats are the only thing you can use...but they do have higher compression and better air flow....i have used the autolite 3923 plats in my truck for about 25k miles and no problems at all...if i keep my foot out of it i get about 18 mpg in the city..on the hwy it doesn't matter...its usually always over 20mpg and thats doing over the speed limit



The power packs (aka coil packs) on the plugs don't produce enough current for platinum. By using them it will cause damage to the motor.. improper spark means poor combustion in the cylinders.

just curious but where did you get this info?

Stay away from the platinum plugs for our trucks. They aren't recomended at all. Platinum breaks down under a very high current. The coil pack setup that our motors use produces a very high current compared to the old single coil style setups.
now you post is opposite of the one above...where did you get your info?


and here is some info on different plugs

I have heard that platinum plugs aren't very good for performance...how is this so?

All things being equal, a more powerful spark will create higher cylinder pressure which will create more power. The power of a spark is determined by its voltage (more voltage = more powerful spark).

Aside from variables such as cylinder pressure and A/F ratio, the amount of voltage required to jump across the gap of a given type of spark plug is determined by the plug gap. A smaller plug gap requires less voltage to jump across the gap and a larger plug gap requires more voltage to jump across the gap.

There is a way to reduce the amount of voltage required to jump across the gap of a plug. By increasing the number of sharp edges that the spark can jump from and to (as in SplitFire and Torquemaster plugs) or by using an electrode material that is a more efficient conductor than the standard steel material (like platinum) you can decrease the amount of voltage required to "jump the gap". The only problem is that these "specialty" plugs will produce a less powerful spark than a standard plug will at the same gap. This means that, as long as your ignition system can provide enough voltage to jump the gap on the spark plug all of the time, with these "specialty" plugs installed in your car your engine will produce less power than it will with standard spark plugs. The only way you can regain the power lost with these "specialty" plugs is to open their gap out farther (a wider gap requires more voltage to jump the gap).

I've seen a number of cases where people have installed SplitFire, Torquemaster or platinum plugs in their car in the place of standard spark plugs and have complained of reduced power. In all of these cases the specialty plugs were installed using the plug gap specified for the car's original standard plugs (with the exception of the Torquemaster, whose gap is not adjustable). The reduced spark power due to the reduced voltage requirement of these plugs was the culprit.

Nissan DID address this problem by specifying a larger plug gap when using platinum plugs (0.039" to 0.044") instead of standard plugs (0.032" to 0.035"). In this case, the platinums will produce roughly the same spark energy as the standard plugs while providing an extended service interval (50K to 60K miles for platinums versus 20K to 30K miles for standards).

AleroGuy
03-24-2007, 09:07 AM
Don't know if i agree with that at all....when i worked for Honda you could put a champion or autolite in there and just listen to the rough idle...put a NGK or a Denso iridium in there and it was smooth as butter....

i have found this to be true as well.

seems NGK and Denso are better suited for honda/acura/etc.......

while autolites/champion/ seem to run better in domestic.

i put NGK's in a chevy blazer once and that thing ran like piss. replaced them with stock ac/delco plugs and ran like a champ again

2000Quad
03-24-2007, 02:34 PM
alright so my haynes manual has gone missing...these caps are they a part of the boot? how do i get the boot assembly off? never messed with anything like the 4.7 set up

DocZ
03-24-2007, 03:04 PM
You unplug and remove nut holding coil down and gently lift coil straight up. 2 you remove brackets from intake that supports heater pipes to allow access to the 2 coils under pipes.
PM me if you want a couple pictures of the parts and brakets ,bolt locations etc.
Pete

Anthony
03-24-2007, 03:50 PM
alright so my haynes manual has gone missing...these caps are they a part of the boot? how do i get the boot assembly off? never messed with anything like the 4.7 set up

Check out my site for pics and info on changing plugs look under the Maintenance link.

2000Quad
03-24-2007, 04:18 PM
i guess after having the same plugs for a 177k miles the coils get a little tight...just took a little convincing and they came out nice...and yeap took me right around 1hr to do everything....here's a before and after too...

http://i26.photobucket.com/albums/c144/Cliffstuff/0324071025.jpg

2000Quad
03-24-2007, 04:19 PM
so what are the chances looking at those that i wasn't running on all 8 cylinders lol.....oh yea and now the truck idles quiet and smooth as hell

2000Quad
04-01-2007, 02:52 PM
oh btw i gapped the new plugs then gapped the old....new plugs gapped right at .35 old plugs... .95

Khyren
04-04-2007, 11:40 PM
Well, I finally got around to putting the new copper plugs in the truck... WOW is all I gotta say.... after having the stock plugs in there that were trashed... they still ran better than the bosch plats.... but now with new plugs like what came factory... it's a whole new animal... first is useless again and second can still break the tires loose almost anytime you want too.... don't know how the mileage is now though

Khyren

Edit: wrong name... been on too many msg boards today

024.7durango
01-25-2010, 03:27 PM
NGK V-POWER ZRF5F-11 (2262 or NGK V-POWER BKR7E part number 4644 I am putting a HO jeep engine from a 2002 Overland into my durango same year, I have used 3923's in the durango engine since 2002 no problems, in an email from NGK they say the BKR7E part number 4644 is equivelant to the 3923 but from reading previous posts is the 3923 good for the HO's or should i use one of these NGK's?

actually on that HO plats are the only thing you can use...but they do have higher compression and better air flow....i have used the autolite 3923 plats in my truck for about 25k miles and no problems at all...if i keep my foot out of it i get about 18 mpg in the city..on the hwy it doesn't matter...its usually always over 20mpg and thats doing over the speed limit




just curious but where did you get this info?


now you post is opposite of the one above...where did you get your info?


and here is some info on different plugs

I have heard that platinum plugs aren't very good for performance...how is this so?

All things being equal, a more powerful spark will create higher cylinder pressure which will create more power. The power of a spark is determined by its voltage (more voltage = more powerful spark).

Aside from variables such as cylinder pressure and A/F ratio, the amount of voltage required to jump across the gap of a given type of spark plug is determined by the plug gap. A smaller plug gap requires less voltage to jump across the gap and a larger plug gap requires more voltage to jump across the gap.

There is a way to reduce the amount of voltage required to jump across the gap of a plug. By increasing the number of sharp edges that the spark can jump from and to (as in SplitFire and Torquemaster plugs) or by using an electrode material that is a more efficient conductor than the standard steel material (like platinum) you can decrease the amount of voltage required to "jump the gap". The only problem is that these "specialty" plugs will produce a less powerful spark than a standard plug will at the same gap. This means that, as long as your ignition system can provide enough voltage to jump the gap on the spark plug all of the time, with these "specialty" plugs installed in your car your engine will produce less power than it will with standard spark plugs. The only way you can regain the power lost with these "specialty" plugs is to open their gap out farther (a wider gap requires more voltage to jump the gap).

I've seen a number of cases where people have installed SplitFire, Torquemaster or platinum plugs in their car in the place of standard spark plugs and have complained of reduced power. In all of these cases the specialty plugs were installed using the plug gap specified for the car's original standard plugs (with the exception of the Torquemaster, whose gap is not adjustable). The reduced spark power due to the reduced voltage requirement of these plugs was the culprit.

Nissan DID address this problem by specifying a larger plug gap when using platinum plugs (0.039" to 0.044") instead of standard plugs (0.032" to 0.035"). In this case, the platinums will produce roughly the same spark energy as the standard plugs while providing an extended service interval (50K to 60K miles for platinums versus 20K to 30K miles for standards).