Well after hours of searching i have found all the part number for the NGk spark plugs that are compatible with the 2.3 and 2.4 motors. The plugs go from heat range 5 to 8
heat range 5-TR55ix -7164
heat range 6-TR6ix -3689
heat range 7-TR7ix-3690
heat range 8-TR8ix -3691
For heat ranges 6,7, and 8 the gap will have to be set on these, since they are not plugs intended for our cars. The common gap to set these at is .035, stock gap is .060
The numbers 6,7, and 8 all represent the heat range, normally there would be a number following the 6,7 or 8 but that number refers to the gap (ex.tr65), which u can set urself
Part number 3692 is not a recognized part number on the Ngk website. But some other websites recognize it as a TR65IX
Hopefully this will help someone, now all you have to do is go to NGK.COM and type in the 4 digit part number, this is also the number most part stores will also recognize because you cant walk into pepboys and ask for some tr6's for a cavy, they will never find it. Also these are all iridium IX plugs
Here are the spark plug specs for the 2.3/2.4 motors also
Iridium IX Plug, 14mm Thread, 17.55mm (.691") Reach, 5/8" (16mm) Hex Size, Tapered Seat, Resistor, Solid Terminal, Projected Tip, Fine Wire (0.6mm) Iridium Center Electrode, Tapered Cut Ground Electrode, .040" (1.016mm) Gap,
On champion plugs the thread length is 18mm and not 17.55 like ngk
Another difference which wont matter much is that the stock recommended plugs have a removable terminal (TR55) and anything colder have a solid terminal
if it can't win a race it better win a show
I'll get the numbers for the 2.2/2200 LN2 guys at work today and post em up tonight.
Since this is an NGK spark plug part number thread.
for the eco i use the LTR7IX-11 they are 2 steps colder than stock and i have not had any problems with them yet. granted they are pricey but still worth it.
4177 is a v-power plug and its not iridium, those part number where mainly for the guys running boost. or highly modified, that need to run colder plugs
if it can't win a race it better win a show
you realize you can't gap irdiums either right unless your very talanted but they will not return them if you attempted to gap them
JBO since July 30, 2001
1fast 2point3 wrote:4177 is a v-power plug and its not iridium, those part number where mainly for the guys running boost. or highly modified, that need to run colder plugs
I used them and made 438 whp at 18 psi....
IIRC, they are 2 steps colder (heat range 6)
Marksy32 wrote:1fast 2point3 wrote:4177 is a v-power plug and its not iridium, those part number where mainly for the guys running boost. or highly modified, that need to run colder plugs
I used them and made 438 whp at 18 psi....
IIRC, they are 2 steps colder (heat range 6)
i was gonna say that. just because you're boosted doesn't mean you need iridium plugs.
87 Firebird
All stock...........lol.
Yeah ur right u dont need iridium plugs, i just thought i would post the info since thats what i found while looking for them, and a heat range 6 is only one stage colder, cavalier run heat range 5'S stock. And some people preffer to use other materials like platinum or copper, i dont really believe there is one specific plug or plug material that will work for every cavalier, it all depends on ur setup and what u want to do. Some people want nice safe tunes and some people want to push there car to the limit, but i figured this would at least save someone the time if they decide to go with NGK. I personally like them, I installed some TR6's yesterday. I had TR55's and just by changing the plugs it smoothed out my idle a little. But thats not to say that some champions or bosch or any other plug couldnt have done the same thing
if it can't win a race it better win a show
I just bought some LTR5IX-11 (4344) NGK plugs for my ecotec. I'll install this weekend and post up. I used to have NGK iridium plugs years back, loved them. Switched to DENSO iridium for a while, then to AC Delco iridiums, now back to NGK. The NGK iridium plugs I initially had (forgot part #), I noticed a nice difference. All the aforementioned plugs did not make that much of a difference when installed.
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