spark plug question

[FuelSlut]

ok I run denso irridium plugs. I know most of us run irridiums on here. Now I heard that we should stay away from irridium on higher boost. Did any one else hear or read about this?

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[ILLINI-SVT]

I just researched plugs this morning. From what I have found:

There is a rumored issue that high boost would tend to blow out the spark or lead to problems with quenching. Since the iridium plugs are a very fine tip, they would be easier to blow out.

All indications however are that the iridium plugs used in the Cobra motors do not suffer any such issues even with high boost. Possibly, the lower voltage requirements of the iridium plugs produce a stronger spark.

Now my experience:

The stock plugs in my Lightning led to a rough idle as they aged. I put a set of Denso Iridiums in, and it was as smooth as can be.

I was going to change the plugs on the Cobra. I liked the Densos with the Lightning, but there have been wide reports of the centers of them cracking in the Cobras. That, coupled with the $12 pricetag, has led me to order a set of the NGK TR7IX (NGK's equivalent iridium plug). Rock Auto sells them for $7.20 each - $64 total shipped.

 

[Wiked03]

I refuse to run iridiums cause I am cheap... Plain ole $2 NGK TR6s are working just fine in the Cobra and the Lightning.

 

[ChicagoMike]

The tips break off on the Denso iridiums and do damage to the motor. Plenty of threads on this on modfords and svtperf.

The NGK TR IX series which are iridium have held up, no reports of tips breaking off.

Don't use Denso Iridiums unless you really want to risk it - and I think it WILL happen.

 

[Cobratom]

ok I run denso irridium plugs. I know most of us run irridiums on here. Now I heard that we should stay away from irridium on higher boost. Did any one else hear or read about this?

I ran the Iridiums just like everyone else. I suffered from spark blowout about 5800 rpms. Replaced with NGK TG6's gapped at .034 with the granitelli Coil Packs and it idles and runs like a banche.

 

[02RedL]

I ran Densos in my Lightning with a built JL motor, and I loved em!

 

[FuelSlut]

I just researched plugs this morning. From what I have found:

There is a rumored issue that high boost would tend to blow out the spark or lead to problems with quenching. Since the iridium plugs are a very fine tip, they would be easier to blow out.

All indications however are that the iridium plugs used in the Cobra motors do not suffer any such issues even with high boost. Possibly, the lower voltage requirements of the iridium plugs produce a stronger spark.

Now my experience:

The stock plugs in my Lightning led to a rough idle as they aged. I put a set of Denso Iridiums in, and it was as smooth as can be.

I was going to change the plugs on the Cobra. I liked the Densos with the Lightning, but there have been wide reports of the centers of them cracking in the Cobras. That, coupled with the $12 pricetag, has led me to order a set of the NGK TR7IX (NGK's equivalent iridium plug). Rock Auto sells them for $7.20 each - $64 total shipped.

So to be safe run the ngk tr6 or 7 and what abut the coils?

 

[ChicagoMike]

How much HP and Boost are you planning on making (eaton?) This determines which plug you should use (cold or colder), what gap - and as for the coils, there really isn't anything available yet. Weapon-X is supposed to come out with them "any week now" and Granatelli as well (the old granatelli's don't fit correctly and it's a total hack-up job).

 

[doug@performance]

NGK's have always worked out well on everything including our mid 8sec Renegade ride. As far as coils go i personaly have seen the Weapon X fail on a couple of vehicles. The stock ignition can hold its own on a pretty healthy set up 600+h.p.
Just my .02
Thanks
Doug

 

[wizdawg]

I have BR7EFS at 0.028" with a 2.93/4# eaton. Seems to work good for me.

 

[FuelSlut]

How much HP and Boost are you planning on making (eaton?) This determines which plug you should use (cold or colder), what gap - and as for the coils, there really isn't anything available yet. Weapon-X is supposed to come out with them "any week now" and Granatelli as well (the old granatelli's don't fit correctly and it's a total hack-up job).

This spring i plan on getting a KB/whipple. I dont plan on ever seeing over 650rwhp. 550-600rwhp on the street on 17psi, and 19-20psi for track only.

 

[hoofnit1]

Plugs

I go as cold as I can until I run into driveability problems then go back.
In my ported eaten car I run 7s in the 03 turbo car we run 8s and 9s.

 

[dun4791]

This spring i plan on getting a KB/whipple. I dont plan on ever seeing over 650rwhp. 550-600rwhp on the street on 17psi, and 19-20psi for track only.

BR7EFS at 028 for that setup.. See me at work when you are getting prices, I can hook you up a good deal on either one.

 

[FuelSlut]

BR7EFS at 028 for that setup.. See me at work when you are getting prices, I can hook you up a good deal on either one.

Sounds good thanks Lyle.