NGK TR6 out of box gap size

[GloomySVT]

Just a reminder for anyone changing their plugs in their pullied Cobra. Make sure and double check the gap, even when closing it, with fresh NGK TR6 plugs. I used a wire style tool when I first installed them, to what I thought was .035 gap. Got spark blowout when accelerating on the highway, so today I took out the plugs to re-gap them. This time I used a coin style tool. To my surprise, the plugs were at .050 gap, when I thought they were .035 via the wire gauge. Re-gapped the plugs to a snug .032 for peace of mind with the coin tool. Was quite surprised at the inaccuracy of the wire style tool.

 

[Blkkbgt]

I ALWAYS use a feeler guage when gaping plugs. Even the coin style ones tend to be off, measure it with a micrometer and you'll see. When you factor in the human error with the inaccuracy of the coin style you can easily be off 3 to 5 thousandths.

 

[Jsantana91]

Yeah that's crazy. I used 2 different coins and both read different numbers. I'm going to take the plugs out as I'm getting some misfire in low rpms. Going to buy a micrometer. Never thought about it great idea

 

[fangs99]

I put fresh plugs in mine about 1,500 miles ago. Gaped them at .030 with a feeler guage well this week on my way home from work at 5:30am I decided to make a little pull in 3rd. At aroud 5,500 it acts like it has a rev limiter. Any idea?

 

[SnakeBit]

I've used this gapping pliers for years:
http://static.summitracing.com/global/images/instructions/ACC-810-85-016.pdf
I do one plug and check it with feeler gauge. If necessary, I readjust the pliers. Once I get one plug exactly where I want it, then I do the remaining 7. I spot check with the feeler gauge, but once I have the first plug dialed in, the remaining 7 are all spot on.

 

[ctgreddy]

the ONLY way to gap plugs is with feeler gauges! Coin tools and all the other cheap plug gappers are terribly inaccurate. I've probably installed close to a thousand tr6's in various cars, 99% of the time they come out of the box at .035-.036. But if that's the spec you want, never assume that's what they are and double check them.

 

[Bigggy]

the ONLY way to gap plugs is with feeler gauges! Coin tools and all the other cheap plug gappers are terribly inaccurate. I've probably installed close to a thousand tr6's in various cars, 99% of the time they come out of the box at .035-.036. But if that's the spec you want, never assume that's what they are and double check them.

X2, feeler gauge here also and never had any problem.

 

[03' White Snake]

0.040"

 

[Venom351R]

I picked this up awhile ago.

 

[How2003cobra]

Thank you all much appreciate all your help