Denso Iridium IK22's?

[scdsolara619]

Just wondering how long should you run the plugs before changing again. I was told 30K miles, but seems a little too soon, for me at least. How long do you guys run with those?

Thanks.

[Sleeper]

Are the IK22 a good set up to use on our cars?

[SC V6]

for S/C applications only

[JavaJoe_2]

Are the IK22 a good set up to use on our cars?

I have a set of new IK20's FS $45. shipped!

[StockSolara]

Iridium are said to last 100,000 miles

[Turbosolara]

depend on how well is your computer tuned. mine last only 10000 miles because it runs under the harsh condition of rich and lean

[scdsolara619]

I found this on the DENSO website under FAQ:

Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes. DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus’ and Toyota models carry an ultra long-life Iridium plug variation (.7mm with platinum tipped ground) that is capable of up to 120,000 miles of service. DENSO Iridium Power plugs, with their .4mm center electrode, have been developed for performance applications. Because gradual wear will “round-off” firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. For this reason, DENSO advises replacement after 30,000 miles.

I guess it all depends on the tip size, therefore the IK22 should be replaced after 30,000 miles.

[siennasc98]

I found this on the DENSO website under FAQ:

Q. How long will Iridium Last?
A. Iridium use represents the most significant technological advance in automotive spark plug manufacturing, since platinum was introduced in the early eighties. As vehicle manufacturers produce increasingly complex and efficient automobiles, there is a greater need for long-life plugs that can tolerate leaner fuel mixtures and improved combustion processes. DENSO has responded to this need by developing its Iridium alloy, originally for OE applications. For example, many newer Lexus’ and Toyota models carry an ultra long-life Iridium plug variation (.7mm with platinum tipped ground) that is capable of up to 120,000 miles of service. DENSO Iridium Power plugs, with their .4mm center electrode, have been developed for performance applications. Because gradual wear will “round-off” firing points over time, the concentrated firing power and voltage requirement benefits will be reduced. For this reason, DENSO advises replacement after 30,000 miles.

I guess it all depends on the tip size, therefore the IK22 should be replaced after 30,000 miles.

The Iridium (Denso P/N SK20R11) .7mm sparkplug with platinum tipped ground from Toyota/Lexus is the one I'm using.

The Toyota P/N is 90919-01210.

The currently installed (6) plugs on my 98 Sienna are in service for about 47k miles now and they are still excellent condition.

[Sleeper]

so what would be better? IK20 or IK22? My friend had a supercharged EG on a K Series motor using IK22 and 2 of the electrodes cracked off completely. I've never seen that before.