NGK TR55 spark plugs good for LT1 ?

[LoudLT1]

they have them on ebay for $20 shipped
good deal???
ed

[Z Ya Later]

they have them on ebay for $20 shipped
good deal???
ed

Very good plug, not sure on the price. Many users here use them...I bought a set of Iridium's that will go on once the current start to show enough wear (or I'm feeling masochistic lol)

[95TransAm]

Very good plug...

I concur

[Kevin - Blown 95 TA]

I use TR5 plugs and they were less than $2 locally.

[alenstein]

I got'em for over a year now, no complaints.

[ravenlt1]

Life of plugs?

What is the life of NGK TR55 Plugs? I'm looking to upgrade my plugs in the next few weeks. Thanks in advance for info.

[Z Ya Later]

What is the life of NGK TR55 Plugs? I'm looking to upgrade my plugs in the next few weeks. Thanks in advance for info.

Welcome to the board Raven. It depends on what material you buy the TR55 plug in. They are available in copper (~30k mi.), platinum (~70-100k mi.) and iridium (longer than platinum? lol). Hope this helps

[ravenlt1]

Thanks Steve93Z for the welcome and the info. They are the iridium plugs. Not that would keep plugs in that long , but 100K+? WOW

WHen I purchase these are they pre gapped or not ? If not what is the proper
'gap'?

[Z Ya Later]

Thanks Steve93Z for the welcome and the info. They are the iridium plugs. Not that would keep plugs in that long , but 100K+? WOW

WHen I purchase these are they pre gapped or not ? If not what is the proper
'gap'?

Anytime .

They are not pre-gapped. The proper gap for a stock or near-stock car is 0.050". The Iridium's are supposed to last longer than the platinum's from what I've read, but I don't know how much longer. If you happen to find someone giving out a number, feel free to let me know lol

[Kevin - Blown 95 TA]

I work with the engineers from both NGK and Champion on spark plug projects and I can tell you that iridium plugs are highly thought of, and that's not necessarily true for a lot of the other gimmiky plugs that are out on the market. I'd say that you can't go wrong with the iridiums - they will fire in conditions that other plugs will not.

[Z Ya Later]

I work with the engineers from both NGK and Champion on spark plug projects and I can tell you that iridium plugs are highly thought of, and that's not necessarily true for a lot of the other gimmiky plugs that are out on the market. I'd say that you can't go wrong with the iridiums - they will fire in conditions that other plugs will not.

Ahhh, good to hear. What's the life expectancy on them, assuming normal driving conditions? 100k? More?

[Kevin - Blown 95 TA]

Well, they might last that long, but you'd be crazy not to check them at some interval sooner than that and probably replace them at 30,000. the thing is that these ignition systems are so powerful that they will fire an .080 or bigger gap (on a standard plug), and it will still be working, but not really what you want in your car, if you know what i mean. Now the iridium center electrode won't wear like that ,like a normal plug will, but the u-groove ground electrode is not iridium, and it will wear so that it is rounded off and sparks prefer a squared off or sharp edge, so you would loose some spark efficiency. I think your wires would wear out sooner than 100k also, and you'd have to replace them anyway. Now some new cars have iridiums with a platimum puck on the ground electrode and they are advertised to last 120k or so, but that's a stretch IMHO.

[Z Ya Later]

Well, they might last that long, but you'd be crazy not to check them at some interval sooner than that and probably replace them at 30,000. the thing is that these ignition systems are so powerful that they will fire an .080 or bigger gap (on a standard plug), and it will still be working, but not really what you want in your car, if you know what i mean. Now the iridium center electrode won't wear like that ,like a normal plug will, but the u-groove ground electrode is not iridium, and it will wear so that it is rounded off and sparks prefer a squared off or sharp edge, so you would loose some spark efficiency. I think your wires would wear out sooner than 100k also, and you'd have to replace them anyway. Now some new cars have iridiums with a platimum puck on the ground electrode and they are advertised to last 120k or so, but that's a stretch IMHO.

But changing them in the 60-100k range wouldn't be bad, right? They should last that long without a problem, right?

[Kevin - Blown 95 TA]

But changing them in the 60-100k range wouldn't be bad, right? They should last that long without a problem, right?

I'm sure you could leave them in 100k and the car would still be running OK, but do you want a high performance car or don't you? Maybe you could take them out and sharpen the ground electrode once or twice, but you want to leave them in 100k and not check them, you should go with double platinums or iridium/platinum and hope the pucks don't fall off.

[Z Ya Later]

I'm sure you could leave them in 100k and the car would still be running OK, but do you want a high performance car or don't you? Maybe you could take them out and sharpen the ground electrode once or twice, but you want to leave them in 100k and not check them, you should go with double platinums or iridium/platinum and hope the pucks don't fall off.

Yeah, I want the performance...but I also want my hands to stay in one piece lol. Let me rephrase my question...can I treat the NGK Iridium TR55 plugs like one would treat platinum plugs or should I treat them like copper plugs?