Spark plugs

[sidewazegtsr]

There's also this thread on SAU.

It's full of VERY usefull information and tips. Basically it'll answer most, if not all, your questions.

http://www.skylinesaustralia.com/forums/index.php?showtopic=104405

These guys seem to know there shite.

[GT-Rob]

Re: Spark plugs

Here is the info I have on spark plugs for the R32 and R33 with NGK:


BCPR6EIX-11 = NGK iridium heatrange 6 gap = 1.1mm

BCPR5EIX-11 = as above but heatrange 5 (factory recommended)

PFR5A-11 = NGK recommended platinum plug for r32 rb engines.


NOTE: For the r32 and r33 engines if buying NGK you need plugs with part number starting BCP, not BK. They look the same but have a different taper. The heatrange 5 is standard, 6 is colder which may be a good idea for more boost, and the recommended gap is 1.1mm, which should be closed up for more boost, which is why .8 gap has been suggested. Its harder for a spark to jump the gap when theres more pressure in the cylinder.

You should have either BCPR5EIX or BCPR6EIX plugs if they are NGK.

Ok so I have been getting mixed infomation about this so I decided to look into more.

Now I needed new plugs so I looked up my stock PFR5As which crossed referenced with the BCPR5EIXs. HOWEVER, I was able to get the BKR5EIX plugs which are the equiv of the PFR5K plugs (out of the rb25). The only difference I see is the taper like you said.

So I called my NGK dealer to clear it up and he said that they will work, and the only difference is that the plugs will sit slightly higher (less than 1mm) and that there is no problem with this. It would be the same as running a thicker head gasket or having different pistons.

in any case I am going to try them tonight and see what happens. The reason I am staying with the BKRs is that I picked up all 6 new for $30 and I have to pay full price for the BCPs

[GT-Rob]

Just an update, car runs fine with these spark plugs.

Just changed them tonight and put 50km on them. car runs better than it ever has since it got here. I am going to check them again at 1000km and again at 10000km to be sure.

[turbo_CRX]

My car came with HKS F35's, r32 gtst type m (RB20DET) and I have never had a car run this good, I check them every month to see the color and burn pattern and they are working amazing.

[GTR-Dad]

I just changed from BCPR6EIX11's to BCPR7EIX (implied 0.8 mm gap) on my 89 GTR as part of the freshening up process. The old plugs looked healthy. Gaps were 1.1 mm with only #1 a bit wider.

I'm running an Apexi Power Intake and full 3" exhaust (down pipes, test pipe, HKS Priest exhaust) with about 11 psi boost.

I couldn't rev over 6k with much load because of hesitation and concerns that bad things were happening inside. With the new plugs the engine pulled hard to 7500 rpm and beyond. (Glanced down and saw 7500 go by. :shock: Note to self - Shift!)

There still may be some preignition or detonation I can't hear, so I'm not pushing it until I get my Power FC installed and tuned.

Going a heat range cooler and running the smaller gap really worked wonders. Thanks Sean and others!

[quebecgtr]

hks or ngk?

When i went to pick up my car at the train yard, it would start. took the car 2 the shop n pulled the plugs out...they were wet fooled! Dried them n put the back in and it started fine.Have hks s40 in my gtr..car was runnin ok until i let my car sit for a week without startin it. went to start it...nothin! pulled the plugs out..they were soaked with gaz. Could it be that they are too cold of a range??? they are 8's. I dont know if I should replace them with the ngk equivalents or go with an heat rang of 7!?!?!

[quebecgtr]

spark plug!

I went to buy a replacemant for my hks s40 plug. I wanted an heat range 8 ngk iridium plug .BCPR6EIX-11 being the stock replacemant i wanted to go with 2 heat range cooler but they dont make them!!! Could only get a 7 range. Called NGK and the guy told me that the right plug would be BKR8EIX! Is that true? Anyone using them?

[WRick]

Honestly, this thread is VERY confusing.

Can't we just have a list with working plugs and part #'s ?

Got an rb25. What plugs do I use ?

Ngk please.

[WRick]

Here's my inmput concerning spark plugs for RB25's.

Engine came with BKR6EIX-11 ( no idea on gap, lost the tool somewhere in laundry )

I replaced with ngk 6662's. Coppers, gapped at 8mm. Runs great, and UBER CHEAP.

Enjoy.

Rick

[atmguy]

Here's my inmput concerning spark plugs for RB25's.

Engine came with BKR6EIX-11 ( no idea on gap, lost the tool somewhere in laundry )

I replaced with ngk 6662's. Coppers, gapped at 8mm. Runs great, and UBER CHEAP.

Enjoy.

Rick

Um 8mm gapping? Are you sure?!!


AH!! .8mm Nevermind!!!

[Stinky_1]

ok, so I know I may be beating a dead horse here. BUt I gotta ask.....

Rather than the NGK spark plug numbers could we get a vehicle in the NA market that has the SAME spark plugs in it? For example, If I walk in to Crappy tire, Napa, or any other parts place. and I am looking at the different brands and types of plugs. What vehicle could I look up that the plugs would work in the rb as well?

I just looked up online at NGk's site to see which vehicles use the BCPR6EIX-11 plugs. I get a huge list of different honda's and acuras, and Nissan and everything.

SO I am wondering, would ANY plug listed for all those other vehicles fit into the skyline and match the taper and thread length and all that?

Please shed some light on this. The whole "NGK part number" thing seems to be leading to too much confusion.

EDIT: For example, cross referancing with the site online I notice that a Honda Civic DX (1.5 sohc) lists the same plug type. Now I know I bought some of these BCPR6EGP plugs to do a tune up on my wifes civic 1 year ago, and never got around to installing them. So I have a package of 4 of those, and could easily go pick up another 2 and put those in. I am sure I wll get all kinds of people commenting on
"driving an expensive car so put expensive parts in it", and
"if you cant afoord $60 for spark plugs then just sell your car because you cant afford it...." and so on.

But anyway...... The point I am trying to make is, if we say for example

"when getting spark plugs for your car you should look up a 91 honda civic DX with 1.5L engine, and ANY plugs listed for that car will work in your car. It is recomended though that you get IX iridium plugs whenever possible"

Would that be fair to say? Just looking on line it seems the other specs are the same. Just the center electrode is iridium rather than platinum.

Someone feel free to jump in and correct me if I am wrong.

[ecokeRB20]

100% stock rb20det
should I use a colder heat range?

[M13]

100% stock rb20det
should I use a colder heat range?

At least go with a 6. Stock plugs are 5.

I had 7 on stock motor. I've done some minor stuff to it so far and 7s are still in there and working well.

[Dragon Humper]

Recent developements have prompted me to add to this.

For those of you who don't want to ever change your plugs and are running a fairly stock setup with less than 1 bar of boost, .8mm of whatever plug you want to run is fine. Platinum, Irridium, Unobtainium....whatever.

For those of you that are pushing the limits you are just asking for trouble running a plug whose whole purpose is to run super hot on the center electrode so that it burns off carbon and anything else that can get stuck in there and foul the plug. They are a detination promoter, plain and simple.


For those of you that never want an issue with your plugs in a motor that's in the 450+ hp range I suggest the AutoLite AR3923 Race Plug. It's a super cold, copper plug with a thicker, cut-back ground strap so it will never burn off even with 500hp of NOS (Outlaw 10.5 cars running 7 sec. quarters use them). The best part of all is that they are only $3 each from anyone who sells AutoLite.

And before you think that they might be too cold, don't. With a good tune, good gas and a motor that doesn't use oil there is no such thing as a plug that's too cold in a turbo application. I've been using them for the last 3 months and they come out squeaky clean every time I pull them.



Jon.

[Skym]

They use Autolite AR5383 sparkplugs on Nitro engines -

http://www.bmeltd.com/Dragster/specs.htm

and

http://www.bmeltd.com/Dragster/sponsors.htm