Ngk spark plugs

i was recomended ngk -9 plugs for my tune-up from serval different racers on some froums i go on;;;RBS has killer deal on -10 ngk's..what's everyones thoughts on going from -9's to 10's?or should i stay with the -9's?if i go to the -10's what changes think i'd need to do;;haven't made any passes on the -9's so don't have a plug reading;;i put my eng specs on the fourm's and -9's was what most suggested me to go with;;I need to buy plugs ASAP;was having plugs reached to me to reinstall in car and they dropped 2 of them on the floor so i'm affair to use them for test n tune..not sure if they got cracked when dropped and Iknow that would be bad news if cracked and try to run car with them so need to buy new plugs to be safe then sorry;;

 

Mike, I have a lot of respect for you on reading plugs. But isn't your answer contrary to what you've preached in the past as far as running to cold of a plug??

Blessings........Ron Clevenger

 

I had the same problem last year and I took Mikes advice also. I got a great deal on the 10's when I was using the 9's in the past. The engine didn't know the difference.

Corey

 

Thanks, makes sense. I also have some 10's that I'll use up.

Just a thought or I suppose question. I recently changed my fuel system (ProCharged blown alcohol) and was running 9's. It nipped one plug strap which gave me a heads up on the tune up, but didn't hurt anything else. The colder plugs (10-11), will that move the burnt strap clue to a point were more damage is the result? Seems to me it would.

Blessings..........Ron C

 

I guess I need to pose the question better. My question is, going to a colder plug and with the same tune up as with a 9. Will the 10 or 11 move the point at which the strap gets burnt with the 9. In other words, the strap on the 9 burning gave me a big heads up I'm on the edge with that cylinder. Will the 10 or 11 cover that heads up and allow more heat before the strap burns and maybe starts affecting the piston.

I thought (in my own mind anyway) that it was a simple question. But now I'm starting to sound crazy

Blessings........Ron C

 

I get what you're saying Ron; I was wondering this myself a couple weeks ago. I've been using old nitrous plugs to warm mine up, ended up leaving an old set of -11s in for a pass because we got in a hurry. Nozzle line came loose, took the strap off and torched the head. The line came loose 0.3 seconds before I lifted (no, I'm not that good, just came off right before the finish line). I was wondering if I had been running -9s, would the strap have dissapeared soon enough to keep from torching the head? I'm assuming (and I think you are too) that once the strap is gone, that cylinder goes silent, but that may not be true. If its hot enough to burn a strap, it may have the chamber/valves/whatever hot enough to keep running without the spark.

 

Thanks Mike.......................................Blessings..................Ron C