SkidPalace

I hate to actually post this since the part numbers *should* be readily available on a sticky or a common post, but...
What are the part numbers of the spark plugs being used on your supercharged engines?
I see that Denso K16TR11s are the stock standard plugs. The NGK equivalents are the BKR5EKB-11s.
All I find in my searching is "one or two degrees colder plugs" in order to retard the "ping" a bit.
A denso Iridium plug model IK22 has also been mentioned in some threads. A look at the Denso chart shows the IK16 to be the "proper" iridium plug for the 3.4. I will assume the IK22 is the "colder" version of the IK16? If so, what is the colder version of the NGK plug?
The "Speedy's Supercharger thread" also mentions reducing the gap from .044 to .033 or less.
I have not checked first hand, but my paperwork from the last dealer service some 40K miles ago show part number TO90919-01192, which is a standard Denso K16TR11 plug for the 3.4 at $2.69 a pop.
As it is probably time to replace those things anyway, I may as well get the right ones.
The funny thing is that my engine doesn't really have a ping problem, so when I get the right plugs, it should be even sweeter.
What are the part numbers of the "colder" plugs you are running in your S/C engines?

mt_goat

Yes, suppost to be 2 steps cooler.


I'd like to see some good info on that too.

I'm using the IK22 right now, but they aren't wearing good on the drivers side. More on that here: https://www.yotatech.com/forums/f2/e...h-bank-177019/

Tragic Drive

Yep, I've had nothing but problems using the IK22's . Two separate sets I've installed. First ones lasted a little over a year, the second set didn't even give me two months before random misfires.
I went back to factory plugs and It runs better than ever.

MAIS0N

I ran the IK-22's for about 6 years with good results. Gap was the out-of-the-box gap they came with. (.032" I think) I just replaced them and gapped them to manufacturer spec but I have been rethinking that. I probably should have stuck with what worked.
I my case the significant wear was on the passenger side. Most of the wire electrode was worn down but the driver side plugs still looked pretty good.

*Edit* Oops. Got my left side mixed up with my other left side. Correction: Significant wear was on the DRIVER side. My bad

okie81

Gap out of the box looks to be around 0.028 to 0.032.

I'm on my second set of IK22's and I think the sweet spot lies somewhere around 0.035 gap. Of course it varies for each application, but I seem to have my best output at or near that range.

Still waiting for the VK22's to come around...

eddieleephd

bkur7et copper core two step cooler plug by ngk. is one recommended by some I run them on my non forced air induction.

this is definitely one you should choose to try a different one for the next couple tune ups and see which one YOU like best

j-man

Screw the iridiums and go to clubplug.net and order yourself some ngk bcpr7et plugs = 2 steps cooler copper plugs. ITs what gadet used to sell/recomend before the iridiums came out.

eddieleephd

ok now for some reason I see a conflict in part numbers

I get the bkur7et plugs at advanced auto parts and I could have swore at one time this was the number gadget used??? bcpr7et??? or bkur7et???

maybe the difference is that the bkur7et is a tripple ground and the bcpr7et is just dual ground??
both being a two step cooler plug.

GADGET!!!!!!!

j-man

ha, how crazy. i just checked mine since i have 6 new ones sitting on my bench and theyre the 3 prong ones. I wonder what the difference is now.

mt_goat

If I understand correctly the ground strap wears down more on the drivers side and the center point wears more on the passinger side. My drivers side wear was to the ground strap, the center iridium point looked good. Of course the more ground straps you have the less wear you'll get to each one, since they share the work. Probably why Toyota says to use dual ground strap plugs.

In my case the extra heat of running 10 psi of boost may have made the wear worse. My mileage on these plugs is still low, so I regapped them and will keep an eye on them.

okie81

That brings up a good point Dale. If you go to a smaller pulley and increase your boost psi (along with heat), would it be advantageous to open up the gap even more? I've heard about "Blowing out the Wick" on forced induction motors, just curious if it's significant at higher levels of pressure (>7-8 psi).

SkidPalace

Well I just found this chart in the Denso spark plug catalog online on page 5.




Here is the full breakdown of the part numbering system of the denso plugs:



Using this breakdown it would seem that the proper Denso standard copper plug in the two degrees colder version would be the K22TR11, and the NGKs assumably would be BKR7EKB-11. However, I cannot find any reference or link to those plugs.

SkidPalace

This helps explain why colder plugs are helpful in our s/c engines.

http://www.youtube.com/watch?v=LbR75wq9nmM

mt_goat

Great info, thanks.

MAIS0N

Went out and looked at the old plugs last night. Really odd. The driver side plugs had almost no iridium post left but the passenger side plugs still had almost the same gap that the were installed with! These plugs have 60k miles on them. I'm running a more conservative 6-7psi boost.

Anybody gone colder yet? Like an IK-24?

Odd, search function doesn't work for "IK-24"...or "IK-(anything)" for that matter.

okie81

That would make sense with the waste spark system, but that's still pretty good mileage for the IK22's. Any pictures?

I had the same problem, try removing the dash.

Greg_Canada

Im urnning the bkr7E's in my 3sgte celica. 2 steps colder than stock. I believe they work in our truck motors as well.

MAIS0N

My camera is not-so-great but I did my best:
http://i20.photobucket.com/albums/b2...aEngine007.jpg
http://i20.photobucket.com/albums/b2...aEngine008.jpg
http://i20.photobucket.com/albums/b2...aEngine009.jpg
http://i20.photobucket.com/albums/b2...aEngine010.jpg
http://i20.photobucket.com/albums/b2...aEngine011.jpg
http://i20.photobucket.com/albums/b2...aEngine014.jpg
http://i20.photobucket.com/albums/b2...aEngine015.jpg
http://i20.photobucket.com/albums/b2...aEngine016.jpg
http://i20.photobucket.com/albums/b2...aEngine017.jpg
http://i20.photobucket.com/albums/b2...aEngine018.jpg
http://i20.photobucket.com/albums/b2...aEngine019.jpg

j-man

wow, those things are toast. Just think of the boosted hell those went thru...

mt_goat

Let me guess, the 3 on the left were from the passinger side. Those are really toast. I'm thinking the 3 steps cooler may be worth consideration.