NGK Iridium Race Plugs

Has anyone tried the NGK Iridium racing plugs in a blown or nitrous Pro Mod type application, or have any thoughts about doing so?

 

which number would you run in blown

 

Magneto or CD ignition?

 

Correct, Kenny is partial to the Motec CDI-8 igniiton.

All of the NGK Iridium plugs that I've looked at (part number suffix IX) seem to have a very fine/small center electrode. Just wondering whether that electrode might quickly become a glow plug? NGK did not seem to think so when I talked with them, but having real world feedbak is always nice. I see Bosch have some nice Iridium plugs with the same sort of electrode, but the electrode is fully ecased flush to the tip by the insulator. Less likely to glow plug??

 

NGK is usually pretty good when it comes to tech stuff like that. The ground strap is what glow plugs on the standard b10es and that is why we all run the 6061 style plugs. I would think thata the electode being shielded by the porcelan would help with the situation.

 

We did a small experiment with a fine wire plug and it didn't look like it would take the heat from a 44 amp "welder" but I wouldn't be surprised if it works with a CD.

 

Rb0804, yeah I had wondered about that. It would be nice to have a ground strap sort of like the 60661, but with the Iridium center electrode. Best of both worlds?

Stan was that a bench test or an in-engine test of that plug? Would like to hear more. PM me if you want. We won't be having any "welders" onboard.

 

We just put a fine wire plug in one cylinder and ran about 1/8th mile. Nothing bad happened but the center electrode looked sort of "krinkled" and we just never did any more. We have also experimented a little with the Champion NASCAR plug, but it is really hard to get the gap right. The regular NGK seems to work pretty good so we will probably wait until someone else discovers something.

 

Thanks Stan....

 

Iridium, I think the number was 7440-11 but not positive. Not a scientific test, just put one in a cylinder to see what might happen. Actually not much, the center electrode looked a little abused. The biggest thing we learned from cylinder pressure measurements was to maximize each cycle which got us to thinking about spark plugs. I am going to stop by the MSD trailer and see if we could stick one in the mag tester just to see how it looks.

 

Did you notice anything different in terms of cycle/cycle variation or pressure profile in the cylinder with the test plug?

 

Never did it on the dyno, just stuck one in the motor at the track out of curiosity. The NGK rep gave it to us and being a typical redneck it was "hey y'all watch this". Fortunately nobody got killed.