3 reasons not to buy NGK platinums...

[Zensoku]

Bosch plugs? Bosch SUPER4 plugs? :bahaha: They would have to be the worst plug ever. Alot of wasted R&D there... The produced spark is grounding all over the place, much like an lightning storm! Unstable spark! The best actual spark energy, is the one with the finest diameter with the highest voltage and the shortest distance. (but not too small to not entirely burn the whole mixture evenly)

Predator 666 wrote: NGK BPR6ES - $23 for 6.. Repco..

I'd like to see you fit these plugs into a skyline!! The correct part number is BCPR6ES. Just some friendly criticism to be more careful with your part numbers!

[Zensoku]

but, yeah, i tend to agree with everyone else. this is pointing to either extreme detonation or failure due to heat fatique.. NGK would be quick to point this out too. I have NEVER had to make a claim on faulty NGK spark plugs in my 5 years of automotive retail. The condition of plugs is an excellent indicator of an engine's health/tune.

[JEBEM]

nark

what gap did u have in them

i got those plugs in my VL...

but i put a .5 gap in em and there working fine

[BHDave]

BCPR6ES-11 if you want to maintain a stock 1.1 or similar gap, BCPR6ES if you want .8 gap or less.

I run bcpr6es-11 gapped to 1.05 no misses or anything. Dynoed at 164.2rwkw on 11 psi today with no pings. Found out my pnuematic boost controller brought the boost on way too quickly and the car pinged it's ass off, apparently, not that you could hear it while driving.

You should have seen the near vertical power curve though (I wish I'd got a print out of that run)

[inark]

dale - they were the plugs recommended as factory replacements in the NGK manual.

Danny - .8 but the recomended was 1.1 according to NGK however i was told to gap them to .8 by sam and he guys at ICE.

This car never had this issue before i went to the platinums over the coppers... even running 15psi it never had an issue and the plugs in it had been there for quite some time.

Im at a loss... im going to have to open it up for the 3RD time now and see if they have ****ed up yet again.

[Dr_Drift]

Ni - Possible over heating / detonation put some coppers in and come in for a checkup/

[inark]

BCP7ES's are in and its running well.... will bring it in when we pick up the soarer.

[Cubes]

Busky2k.. The problem with BKR7E plugs is that they are based on the ISO (International Standards Organization) plug height which is 50.5mm.

What the Jap cars need is the JIS (Japanese Industrial Standard) which is 53mm high (when screwed in).

The only problem I can see occuring is if the spring in your coils do not have enough tension then the voltage/spark may not transfer to the spark plug correctly or it may cause the spring to overheat due to slight sparking/arcing in turn eventually damaging coils.

On the USA NGK www site the BCPR6E spark plugs are listed & have a V-Groove. The strange thing is in AUS or where I shop anyway these spark plugs are no longer under the part number BCPR6E.

I found the spark plugs to use which still have the correct attributes with the JIS standard. I can't remember..

I'll have to have another look at the NGK part number break down pdf and this time write down the spark plug number.

When running standard timing and near stock boost you won't notice any difference between the standard type plugs and the V-grooves. I'm able to run more timing when running up around 1-1.1bar with the V-grooves. I've had a little bit of a fiddle as my last set of plugs were standards. I put the standards in and had to drop the timing back as once on boost and powering down the road I would notice a slight hesitation or flattening out.

So I upped the timing again and drove the car.. yep hesitation. Slapped the V-grooves in and no hesitation.