I have stock (I replaced them with the stock ones) AC Delco platinums. Now, I was out last night and sprayed 150 shot during 3 1/4 mile runs. On the last run, I got 3/4 the way and the car felt like it fell off, hard. I let off and let the car slow down. I gave it some gas and it was missing like crazy. It has power, definitely not 100%, but it is drivealble. I popped the hood and didnt hear any knocking or anything like that, it is just missing. I also pulled 3 plugs out of the drivers side and they were orange-ish. Did I demolish my plugs or am I looking at a serious problem. I am going to change them out to some NGK's tuesday I think. I hope its the plugs.

Benji

 

i do know your not supposed to run a platnum plug with N20, mabey thats why?

dont think they can handle nitrous

 

I know, but I definitely have made a few passes with them. I just wanted to make sure it wasnt anything to worry about.

Benji

 

Were the platinum pucks intact on both the eletrodes? Did you check the gap? Were the ground straps burned part way off?

Those are the kinds of things I've seen after spraying on the stock AC/Delcos. They are probably the worst possible plug for nitrous.

 

if the electrodes are not burned off,your gap is probably HUGE. the Delco plugs will lose the plat. pucks quickly with nitrous.


from the sounds of it,that is what happened,you killed the plugs.

 

I did notice that the gap looked awful big when i pulled them out. Well I'll find out tomorrow when i replace the plugs. Thanks for all the help. Also, do you nitrous performance when you dont run the right plugs??

Benji

 

You can lose HP and possibly damage the engine on nitrous and the wrong plugs. With the big heavy ground electrode on the AC/Delco plats, you have the equivalent of a glow-plug.... if you are lucky the electrodes will just burn off, and give you a huge gap, which will allow the spark to be blown out. If you get unlucky, the "glow plug" will ignite the mixture prematurely and give you detonation.

 

Thank you for the help. I have some NGK's going in there tomorrow. Hopefully that fixes the problem.

Benji

 

NGK TR6

 

Ok, I finally got the NGK TR6's in today. I definitely melted 5 of the 8 plugs. I dont even know how the car still ran. But now, I have another problem. The plugs smoothed the miss out, but it is still there. It still has a miss through out the whole rpm range. It really doesnt feel much different than it did with melted plugs, just a little bit smoother. What could I have done????

Benji

 

Another possibility here.... and I know this from personal experience - . When the plug electrodes melt down, you have a huge gap. The spark can't jump the gap, so it looks for the path of least resistance. Sometimes, that can cause the spark to jump between two plug wires, or from a plug wire to some nearby metal. I had exactly that happen with the stock plugs, a 150-shot, 8mm Taylor Spiro-Pro's and an MSD-6A. The "cross firing" causes the wire to erode, and ruined the plug wires = rough idle, misfires under load.

 

I have the msd 6a, 8mm spiro pro's, and 150 shot. Is there anyway to test to see if the wires have eroded. I checked the "huffing" thing and there is nothing coming in or going out of the oil cap.

Benji

 

Sure.... put an ohm meter on the wire. If it reads "infinite" you have burned through the conductor.

 

Man I hope that is all it is, I just want it to be nothing internal. I do have I think two wires zip tied together to keep them off the headers. Maybe there, and also, they were arcing pretty bad before I raced, so maybe they got messed up there. Thanks for the help.

Benji

 

not nesc. right? that just means the wire is burned through and completely broke the circuit. You want to look at the resistance of one of equal length(maybe from the other side) and compare them, make sure one is not like 600ohms and the other 20,000 ohms, then you know where the problem is. But I dont think you should ever zip tie wires together, always use seperators. You can get mrgasket serperators that are rather sturdy f/autzone in 4 colors(for you ricers out there) for really cheap. Hope that helps.