Spark plug x-reference

[Wulfgang]

Someone said to use Denso IQ20 plugs on the part list sticky. But I cross-referenced the OEM NGK PFR5A-11 plugs to a Denso IK16 plug using several cross-references, which has an ISO plug length and is one heat range hotter than the IQ20.

Now my 2 questions are:

#1) Is the IK16 too hot for an an RB20DET with nothing more than an aftermarket intake and 3" exhaust for mods?

#2) Will the ISO plug (IK16) fit under the coil packs? The difference in plug height should only be a matter of 1-2 mm.

So basically, why are people using the IQ20 when the IK16 is the true OEM cross-reference? Is it because you turned the boost up?

Shane

[Wulfgang]

Ok, vududoc... I know you said to use the IQ20's. Why?

[vududoc]

Ok, vududoc... I know you said to use the IQ20's. Why?

dude i havent been here in ages

Anyways doesnt matter which one you use. denso iriduim i have found at 9 bucks a piece vice oe plug as high as 20 per plug triple platinum.

Xref the 88 nissan pulsar ca18 at sparkplug.com and you'll have all the plugs for the rb.

i have my accounts with nismo/nissan and bought NGK bcpr6es-11for 1.80 a plug. i will gap them to .8mm. theyre nissan pn 224-01p16 and there is no problem using copper unles youre cranking boost & need longevity. Platinum is poorer conducticity than copper so its a toss up.

the heat range 6 is a cooler plug in NGKautolite does the reverse with their #'s

[vududoc]

Someone said to use Denso IQ20 plugs on the part list sticky. But I cross-referenced the OEM NGK PFR5A-11 plugs to a Denso IK16 plug using several cross-references, which has an ISO plug length and is one heat range hotter than the IQ20.

Now my 2 questions are:

#1) Is the IK16 too hot for an an RB20DET with nothing more than an aftermarket intake and 3" exhaust for mods?

#2) Will the ISO plug (IK16) fit under the coil packs? The difference in plug height should only be a matter of 1-2 mm.

So basically, why are people using the IQ20 when the IK16 is the true OEM cross-reference? Is it because you turned the boost up?

Shane

the iq20 is a cooler plug than the 16 the plug is meant more or less for stop and go(ik16/bcpr5es-11)theres good plug faq out there to read and SDU has good stuf on people whom have cranked up their boost and are using different plug setups to avoid detonation.

[vududoc]

http://www.stealth316.com/2-sparkplugtech.htm

this link has the same plugs x ref.....great write up and faq.it also shows the voltage requirements from a 1.1 gap to a .8 gap.

[Wulfgang]

Thanks for the replies. I went ahead and got the Denso IQ20's for $9.74 each. I didn't know they were the same as the Nissan Pulsar... good info.

Shane

[vududoc]

NP glad to help

[themadscientist]

NGK PFR5A-11 for early RB20DET, later RB20DET, RB25DET and RB26DETT takes PFR6A-11.Save that Iridium foolishness basic NGK platinums are good plugs, never let me down.

[Wulfgang]

I could be wrong, but I think we will start to see iridiums spec'd as OEM parts on some new cars. Although the double platinums are the current OEM durability king, an iridium center electrode with a platinum tipped ground electrode will last just as long as a double platinum while being able to throw a longer spark at the same voltage.

Unfortunately for us, the platinum/iridium plugs are currently sold for a few race-only applications. But when they come out in the RB20 size, I will be buying them.

Shane

[vududoc]

Unfortunately for us, the platinum/iridium plugs are currently sold for a few race-only applications. But when they come out in the RB20 size, I will be buying them.

???????? this makes no sense.....

[Wulfgang]

The Denso IQ20 has a steel ground electrode and an iridium center electrode. But you can buy Denso's with platinum tipped ground electrodes and iridium center electrodes for certain applications.

Check it out: http://www.densoiridium.com/identifyplugs.htm

"IQ20Pt" would be the part # if there was such a thing.

Shane

[vududoc]

i think you are kinda referring to this autolite3923 standardap3923 platinumdp3923 double plattp3923 triple plat

i dont think that they will be mixing and matching the metals the way you have posted.

platinum is a longevity factor....now cars with 100,000 miles between tune ups have them as OE plug preference.

i run coppers till i crank the boost and need a plug that will hold up longer.

there is alot more to read on plugs but id stick with NGK or platinum from other manufactures. i dont care for splitfire.Beru,silverstone, and other plugs id look at but the prices are higher hence i would just look at them.

Just read up on plugs,gapping, & heat ranges and you should be well versed and it would be only a matter of personal choice.

[themadscientist]

NGK already makes irridium plugs for RBs if you can't get the # let me know and I will check the book.

[WDRacing]

For the record, I used 300zx plugs in my RB20DET powered Skyline for 4 years. Worked like a champ...Or like Cam said, simply use the 240sx plugs.

I started out with NGKr Iridiums, they work great, best plug to date that I've used. The Denso is also a sweet plug, so is Autolite. The key is to make sure your not detonating. This more then anything else will jack up your plugs. Since even very minor knock will erode the ground on the spark plug. When I was racing I would go through a set of plugs every week, at 150 bucks thats to much, course thats jap pricing at 24bucks a pop.

ANother tip, mark which side the the plug gap faces, make sure that side faces the intake valves once the plug is torqued. it helps everything from efficiency to idle. Use spacers to get the best lineup.

WD

[vududoc]

The Denso is also a sweet plug, so is Autolite. WD

Which autolite did you prefer? as alot of people shy away from autolite...your personal choice.