Spark Plugs : which ones to use 4age ?

[jondee86]

SutteR... If you already have the plugs in the engine, try this. Find a
long, straight, deserted piece of road, without crossroads, where you can
safely experiment. An uphill slope would be even better. Stop your car,
and when it is safe to do so, take off like your ass was on fire

Give it full throttle and redline every gear !!! If you can make it to the
top end of 5th gear (say 6000 rpm plus) without feeling the car misfiring,
then your plugs are fine If you feel it starting to miss as you rev out
in 3rd, 4th or 5th, then your ignition system can't handle the 1.1 gap
under heavy load.

If it does miss, try a fresh set of NGK basic copper plugs at the 0.8 gap
and see if the problem goes away. If it doesn't, you need to look at your
plug caps, leads, distributor cap, rotor and coil. These should be clean,
tight fitting, no cracks or broken connectors, and the edges of the rotor
should be clean and sharp. Do the basics first

Cheers... jondee86

[SutteR]

Thanks jondee, I will find the solution then.

Another option is to adjust the gap as necessary to have the .8 gap.

[jondee86]

Yes... if you can try to bend the ground electrode in such a way that
the end of the electrode remains at right angles to the pin, you should
have no problem.

Cheers... jondee86

[SutteR]

I might not be a professional enough but can the angle go wrong in a .3mm adjustment? I mean bending the ground electrode .3mm on the end causes a very little difference in angle. Or...should I be wrong?

[assassin10000]

SutteR Wrote:I might not be a professional enough but can the angle go wrong in a .3mm adjustment? I mean bending the ground electrode .3mm on the end causes a very little difference in angle. Or...should I be wrong?

The issue on the IRIDIUM plugs is not adjusting the electrode...

It's measuring the GAP. The tiny little Iridium tips on these DO NOT like ANY kind of contact. They break off with a very small amount of pressure. I was checking the gap on my Iridiums and gave it just a hair to much pressure and broke one off... That is why ngk/denso/ect. do not recommend changing the gap.

I run the BCPR6EIX-11 in my largeport for drifting (constant 6-7.5k rpms for up to 15-30 minutes at a time) and have no issues...

I doubt the gap difference is really going to hurt you.

Andrew

[SutteR]

All I can say: we'll see... Thanks for the answers!

[Red]

Sutte-
Last time I bought stock replacement plugs for my car (bluetop) the plugs were shipped with those nice plastic protectors on the tips to make sure the tips stayed pristine. But, they were all gapped to 0.8mm when the spec for the plugs and my car is 1.1mm.

So despite the "DO NOT ADJUST GAP" warning I adjusted the gap and said the hell with them, I know how to adjust a gap. I just go back and forth between the two sets of factory plugs now, maybe every 20,000 miles I'll pull the plugs, swap in the other set, and clean and regap the ones that came out. Very little cleaning or gapping needed. The hard part of trying to find a 1.1mm wire gapping tool (to measure the gap). In the US, they simply don't exist.

BTW, my plugs are the stock "platinum tip" which is not platinum--just a wafer of it on the tip. 50,000 miles in street use is no problem for them, that's what they are intended for. Copper tips erode much faster. Iridium...Damfino who needs it, certainly not street drivers.

[SutteR]

Hmmm... I don't think a .8mm metal plate would be so hard to find here...I can do it. This story also helps me thinking of adjusting the gap is not a _real_ problem, maybe only a marketing stuff to buy new plugs in every damn year or so...