Iridium VS. Regular plugs

[dhorsman2000]

Who here is running Iridium/platinum type plugs? Are you having issues with knock? My train of thought on them is this: with the smaller electrode I would think that they would be more likely to heat up quicker/retain heat more than regular type plugs, therefore more likely to knock. I am running TR6's right now in my vortecs, but I have knock with them. I was thinking about going to a 7 and see what happens. And possibly a Iridium 7 if I am wrong......

P.S. This is a brand new motor w/vortecs and A/F's are in the 10's when it knocks so I know it's not a lean condition....Thinking the only thing it could be is the plugs....

 

[Luke]

Re: Iridium VS. Regular plugs

I had knock with the denso iridium plugs but I cant say that is what caused it due to putting in a Waller chip with more boost/timing at the same time. Waller has the chip now to pull some timing out and if it still knocks I will put the ngk's back in and see what happens

 

[SY2455]

Re: Iridium VS. Regular plugs

I'm using NGK Iridium UR6IX Part # 7348 in the stock heads with no issues at all.

P.S. This is a brand new motor w/vortecs and A/F's are in the 10's when it knocks so I know it's not a lean condition....Thinking the only thing it could be is the plugs....

Could you have a chip with to much timing? I had always heard that the vortecs heads were more forgiving in the area of knock, unless your timing is really off.

 

[Six-is-Enough]

Re: Iridium VS. Regular plugs

I'm using NGK Iridium UR6IX Part # 7348 in the stock heads with no issues at all.



Could you have a chip with to much timing? I had always heard that the vortecs heads were more forgiving in the area of knock, unless your timing is really off.

X2 on the NGK Iridiums.:tup:

 

[dhorsman2000]

Re: Iridium VS. Regular plugs

Could you have a chip with to much timing? I had always heard that the vortecs heads were more forgiving in the area of knock, unless your timing is really off.

I literally pulled all the timing out of the area where I was knocking and it still knocked????!!!! The spark graph on tunerpro looked like a big bowl. hehe

 

[Bill Z]

Re: Iridium VS. Regular plugs

I’m running the NGK Iridium UR5IX plug gapped to .032 with no problems. I do have my stock engine with stock injectors and an ultimate chip based at 2 degrees after TDC rather than the suggested zero. Everything runs just fine (most of the time). When things don’t run fine, it isn’t the plugs fault.

Just a thought here. try checking your centrifical advance in your distributor.

Since you asked.

 

[mrweelr]

Re: Iridium VS. Regular plugs

I'm using NGK Iridium UR6IX Part # 7348 in the stock heads with no issues at all.QUOTE]

I run the same plugs gapped at .025" and have zero knock at 25psi, bone stock motor. I never had problems with the UR6 platinums either. The stock Delco plugs did seem to knock more...

 

[ashman]

Re: Iridium VS. Regular plugs

UR6IX here too. no problems.

 

[syclone1100]

Re: Iridium VS. Regular plugs

I was using the UR6IX as well but quit till I could get an anwser to why they were orange when I changed them... right now delco's till I figure the color change...

 

[dirtdemon]

Re: Iridium VS. Regular plugs

had NGK's once in, swapped back to delco's - absolutly NO difference in performance, idle, etc ( for me - stock engine/turbo/inj. ) ...

... so why take a risk and walk beside the line, when delco's have proofen a 1000times ??

just :2cents:

pat.

 

[Bill Z]

Re: Iridium VS. Regular plugs

had NGK's once in, swapped back to delco's - absolutly NO difference in performance, idle, etc ( for me - stock engine/turbo/inj. ) ...

... so why take a risk and walk beside the line, when delco's have proofen a 1000times ??

just :2cents:

pat.

Did you know that AC Delco has an Iridium option now?