nbr01f

For those of you running NGK Iridium plugs what gap are you using!!! I have read many posts and have not found a definite answer. So here it goes should I use a 0.040 or 0.060 gap, or somewhere in between
I am confused as hell, especially after seeing the ACDelco Bulletin.

Thanks Guys!!

shaun

well the gap on regular tr55 is about 55. and i think ngk plugs are already gaped mine where[regular tr55's] be carful if you try to gap them it's not that hard to snap the tip off.
hope that helps

BlutVonSchwachen

iTrader: (7)

Last I knew manufactorer recommendation was 60 for stock applications.

TA TECH

iTrader: (8)

I set mine at .055 N/A. If ya spray ya got to gap them tighter!

Marc '99T/A

iTrader: (22)

Are these things worth it? O'Reilly wants $7.00 each for them, and they don't have any of the regular TR-55's in stock. I was going to check the gap on them in the store, but they guy said not to because they come already pre-gapped and you could easily mess up the center post by a gap gauge. WTF???


Please elaborate....

davered00ss

iTrader: (4)

I had them. They went in @ .059, came out at .069. 1 year and 15K later. Lots of track time. I run TR55 copper now.

nbr01f

Thanks for the input so far. I am not sure if the plugs are worth it or not. Gm now uses a replacement Iridium Plug for our cars (Instead of the Double Plat. Ones) and many other gm vehicles. The new plugs are gapped at 0.04 at the factory. The NGK Iridium plugs are gapped at 0.06 from the factory. So I am confused because GM is using a 0.04 gap and NGK is using a 0.06. So for the hell of it I gapped the plugs to 0.04 and have not really noticed a difference. If you are careful and use a spark plug gapper with blade style feeler gauges you shouldn't have a problem gapping the plugs. On the other hand if you use the bent wire style gauges you might damage the plug.

I am currently trying to track down misfire issues and I thought the gap might of caused it, but it didnt..