Spark Plugs?? NGK???

[LETHALxLS1]

I have a 98 z28 and would like to know the exact name of the NGK plugs alot of you guys talk about on here. I believe its NGK 555 but are they the v-groove or not?? I was also wondering how long these plugs usually last as well. I want a long lasting plug so maybe you guys could reccomend a good plug for my car if the ngk plugs dont last long. My car is completey stock as well if that matters. Thanks fellas------mike

[2001NBMZ28]

NGK TR55 V-Power are a favorite, and cheap. (NGK stock number 3951). What do you consider long lasting? Once you've changed plugs a couple times it's easy.

[LETHALxLS1]

NGK TR55 V-Power are a favorite, and cheap. (NGK stock number 3951). What do you consider long lasting? Once you've changed plugs a couple times it's easy.

My problem is I have a herniated disc in my back and cant do much. What I mean by long lasting is something that wouldnt need changed too often.Is 1 time a year about right for plugs if you dont drive much?? Thanks

[2001NBMZ28]

My TR55's have been in the car a couple years now, only put about 5K/year on it though. You can get better, longer lasting plugs but expect to pay a lot more. My car came with Denso PTJ16R15's.

[jeremy_m70]

98 z T56 with 122k on factory spark plugs!!!! Still strip GT's any day of the week!! Of course it would not hurt to change them now (or earlier) but I honestly can not tell alot of difference since it was new, although I haven't check my fuel mileage in a while either, but with 117k i was still gettin 26-28 MPG hwy, averaging around 23-26 MPG.

Point is spark plugs are alot better than they used to be and I (personally) wouldn't be a fanatic about changing them on a factory engine every 5-10K. I have a 05 chevy 2500 4x4 duramax with 70k still running like new. I would think most are good for atleast 80-100K but other's may disagree. Just from my experience!!!!! Also had a 89 toyota 4x4 with 186K when sold and also had factory plugs and wires!! Only problems I have had with spark plugs was when I was 8 and had to replace the spark plug on a go-cart about twice a year.

If you have a modified engine then things are prob. different, but I would think 50k on any sparkplug should be realistic.

[Jon7I2]

At an LS1 shop near my house the mechanics said about 20,000 on the NGK Tr 555's.

[Steve Crowe]

TR55 is a plain copper plug, close the the same heat range as an AC-Delco 41-932
TR55-IV is the v groove plug
TR55-IX is the Iridium plug.

The AC-Delco plugs are usually made by NGK.

The AC-Delco 41-932 and the NGK TR55-IX are theoretically 100,000 mile plugs but I'd regap them around 40K or so.

[LETHALxLS1]

Thank you very much fellas that helps alot

[socmninja]

those tr-55ix's are freekin expensive tho. all the iridiums are

[jigger1166]

98 z T56 with 122k on factory spark plugs!!!! Still strip GT's any day of the week!! Of course it would not hurt to change them now (or earlier) but I honestly can not tell alot of difference since it was new, although I haven't check my fuel mileage in a while either, but with 117k i was still gettin 26-28 MPG hwy, averaging around 23-26 MPG.

Point is spark plugs are alot better than they used to be and I (personally) wouldn't be a fanatic about changing them on a factory engine every 5-10K. I have a 05 chevy 2500 4x4 duramax with 70k still running like new. I would think most are good for atleast 80-100K but other's may disagree. Just from my experience!!!!! Also had a 89 toyota 4x4 with 186K when sold and also had factory plugs and wires!! Only problems I have had with spark plugs was when I was 8 and had to replace the spark plug on a go-cart about twice a year.

If you have a modified engine then things are prob. different, but I would think 50k on any sparkplug should be realistic.

You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.

The factory plugs have been platinum tipped for a while now( since '96? ), and don't require replacement until 100k, under normal usage. But I drive my cars hard, and will need to check/replace them sooner.

[Wesman]

You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.

The factory plugs have been platinum tipped for a while now( since '96? ), and don't require replacement until 100k, under normal usage. But I drive my cars hard, and will need to check/replace them sooner.

I changed my stock platinum plugs at 80K miles and they were totally shot. The gap was twice what it was supposed to be set at. I was getting a slight misfire between 1-2K RPM, so I figured I better pull them out and replace them.

I went with AC Delco Iridiums for the new ones, and I've been happy with them.

[jeremy_m70]

[QUOTE=jigger1166;612207]You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.



Correct, Diesel has GLOW PLUGS not Spark Plugs, Sorry!! Wasn't thinking about it at that time.

[jigger1166]

[QUOTE=jeremy_m70;613374]

You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.



Correct, Diesel has GLOW PLUGS not Spark Plugs, Sorry!! Wasn't thinking about it at that time.

[Steve Crowe]

The Iridium plugs are great provided you're not past moderate modding. Introduce a higher compression ratio, anything that advances the timing, greatly increases the volumetric efficiency or even a touch of nitrous and they'll be too hot.

Sad, as they have an outstanding ability to fire into higher compression but you can't pick and choose heat ranges - yet.

[jeremy_m70]

[QUOTE=jigger1166;613401]

Yeah, I'm sure YOU have never made a mistake!!!!!! I was illustrating my point late that night. At least I'm man enough to admit my mistakes and apologized instead of belittling others.

[GUSHER]

Get The Denso Iridium Part Number It16 You Would Feel The Car Much Better
Im Using Those

[jigger1166]

[QUOTE=jeremy_m70;614748]

Yeah, I'm sure YOU have never made a mistake!!!!!! I was illustrating my point late that night. At least I'm man enough to admit my mistakes and apologized instead of belittling others.

Wow, don't be so sensative.
I know you made a mistake. We all make them. I was just pointing out that you made a "DOH!" I wasn't belittling you. Sorry you took it that way.

[Wheeler99WS6]

The Iridium plugs are great provided you're not past moderate modding. Introduce a higher compression ratio, anything that advances the timing, greatly increases the volumetric efficiency or even a touch of nitrous and they'll be too hot.

Sad, as they have an outstanding ability to fire into higher compression but you can't pick and choose heat ranges - yet.

TR55IX for me........TR6 is heat range colder. Popular for the nitrous guys.

[Steve Crowe]

If I were shooting serious Nitrous I'd move to copper, probably Autolite 104 or 103. If it's just a mild shot the AC-Delco 41-913 is a tad colder than a TR6 and double plat. Good streetability yet won't burn holes in your piston from pre-detonation.