Thread: Quick! Best spark plug for a DE!

The problem with that is Nissan never ran a Non Platinum Plug in the SR20 ... so ... I would bet they never spent any time with a non Platinum plug to tune them ...again ... they just asked NGK which plug was the Non Platinum equivalent of the OE Platinum plug ... and again at that time NGK had the wrong listing ... Again ... this is strait from an NGK Rep !!!

NO NO NO, not what I said or meant.

Here is what I meant: The guy who sold you the plugs knew that our Pistons don't have the extra space for extended electrode plugs, and probably things that regular BKR6E's are extended electrode plugs.



I agree

About the bolded area, technically, if we listen o the manual, and follow it, and something screws up, can't we hold Nissan liable and force them to say give us a new engine if it comes down to that?



Shawn, I will have to apologies to you, I miss read one of your first posts, about Nissan never using the non-platinum plugs. Do to your wording I thought you meant to say that Nissan never used/released a Platinum plug.

This does make it interesting. If Nissan didn't really test the regular plugs and just put them in the manual as a cheaper alternative.

Now for Platinums and Iridiums, did you mention that you do gap them or you don't? Also can you translate the 1.1mm to 1.4mm into standard numbers? .044 is which?

Thanks

Wow.......What a thread. NKG all day.

thanks Rob,,,





and thanks Vadim,,, I just miss understood what you said....

either we all are learning something here or just having fun with this.... I think I'm learning ,,,, sooooo THANKS to all of you even if a few of you disagree about this topic......

from my understanding you never gap platinum plugs because you may damage them

That is very correct, it's hard to get information from people until you try to prove them wrong



That is true, but you could always user pliers

I don't want to come off as an ass to you SHAWN, I am just trying to make my point. For whatever reason, Nissan felt that if you were using standard copper plugs in your SR20DE as opposed to platinum plugs, you should use a smaller gap. This would more then likely be due to the different wear characteristics and spark characteristics between the copper and platinum plugs.


The reason that all parts stores list the BKR6E-11s for the standard plug is because that is what cross references from the SR20DEs suggested platinum plug, the PFR6B-11.
It is obvious that nissan did not intend for the -11 to go into the SR20DE.

Nissan Had the BKR6E listed as the standard plug for the B13, B14, P10, and P11 SR20 powered cars. I do not think that Nissan would have made an uncorrected mistake that has spanned over 8 years.
I think that NGK is wrong. They are basing their statement that "Nissan has made a mistake" solely on the fact that the -11 is what cross references to the PFR6B-11. This is contrary to the fact that it says specifically in the FSM to gap a standard plug to 0.8-0.9 mm for the SR20.

I would think that the Nissan Engineers were the ones who decided what spark plug was suitable for each motor, not NGK engineers. NGK merely makes plugs of varying specifications.
Nissan did not go to NGK and say "we need a plug made of this material with this gap." The BKR6E was used in pre-1990s cars, so it was not specifically made for the SR20DE. Therefore this says to me that the BKR6E was chosen for a reason.



This is my take on it all, and of course the only way we could ever know for sure is talk to one of the engineers who designed the SR20 back in the day.

Reading some SE-R.net I found some similar to your information Shawn.

Link



I highlighted some ares. So the best to use is .045, but Nissan made the gaps smaller to prevent misfires etc.

I think I'll be ordering another set of BKR6E's and testing them with the .045 gap

Just saving you some time here, If gap the BKR6E at .045,it is the exact same thing as ordering the BKR6E-11. All the -11 designates is a larger gap.

Good tip thanks Rob

More at SE-R.net!

http://www.se-r.net/engine/platinum_copper_ngk.html

Read through the article to why the Platinums have a higher gap and look at the bottom bolded sentence.