yellowbanana

I use Denso Iridium plugs, gap setting at 35

Venomous S

can someone tell me what NGK 6564 are?
1 step or 2 step colder?

Also NGK 7173 1 step or 2 step colder?

AusS2000

I take it that's 35 thousandths of an inch, or about 0.9mm.

xviper

Wiser words were never spoken. If only more people running F.I. understood the importance of this and learned how to "listen" to the story that your plugs are trying to tell you.


If I'm not mistaken, the 6564 became the 7173 (new number). I "think" these are 1 step colder.

gsp

Yall sure are vague on this subject.

the 7173 is NGK R5672A-8: -7 for stock and -9 for 2 steps colder
or
the 7405 is NGK5672A-9

Maybe yall can tell me the difference in the
7173 and the 4554 (R5671A-8 )

7173 has a protruded tip over the 4554 but the same heat range and same reach.

S2000RAT

Denso IK24 With the Comptech. They are way better.

modifry

I have spent hours and hours today trying to find info on plugs. After my recent plug disaster I wanted to try a colder NGK plug, particularly now that my car is running like crap and misfiring all over the place again. While it's probably not a "plug problem" I still want a new set of plugs on hand when I pull the existing ones to check them out for the misfiring issue.

Here's what I now know:

1. Auto Parts stores don't know jack - only one out of 9 stores I visited or called even knew that plugs had heat ranges, and he couldn't figure out what plugs were available to fit my car that are one range colder.

2. There is no web site that sells plugs where you can buy a plug other than the factory recommended part. NONE of them let you look up a plug by manufacturer or part numbers, only by your car make and model and then they only give you factory recommended plugs. There is no way to find a colder plug from their site, or even list the plugs they sell. If I could get a list of plugs I could use NGK's cool chart to decode the designations and figure out which one I want.

3. NGK has a ton of good information on their site (like this chart of plug problems and their causes (just for you hecash). BUT - they don't have a list of what plugs they make or a chart to convert a part number (7772) to a designation (PFR7G-11). So if I want a plug one heat range colder I have no clue what part number to ask for because a PFR8G-11 (same designation as stock but one range colder) might not even exist.

Anybody have any ideas on where to get a list of available plugs? And just where can you buy them by part number instead of car model?

Incidentally - NGK recommends 18-21 ft-lb for a 14mm plug in an aluminum head.

.

xviper

[QUOTE]Originally posted by hecash
Let's talk about reading plugs.

I pull my plugs a lot.

Slows2k

[QUOTE]Originally posted by hecash
Let's talk about reading plugs.

Last spring, I noticed tiny metalic-like crystals scattered evenly over the ceramic on my IK-24s.

Slows2k

[QUOTE]Originally posted by gsp