Denso IK24 compared to NGK BKR8EIX technical discussion
Posted 13 December 2004 - 01:48 AM
The specs on each are.
Denso IK24 ($11.99)
Iridium center electrode= 0.40mm
Ground electrode = U groove
Electrode = tapered cut
Pre-gap = 0.32"
NGK BKR8EIX ($7.60)
Iridium center electrode = 0.60mm
Ground Electrode = flat
Electrode = tapered cut
Pre-gap = 0.30"
From the above I would deduce that the IK24 is technically the better spark plug, but in a FI application, would the smaller gap from NGK make up for some of the difference? Also is Denso's U-grove proven or could it be more marketing than technical advantage.
Essentially my focus is on real world differences and results vs. technical specifications that are often hashed in with marketing.
Posted 13 December 2004 - 02:05 AM
I used the OEM platinum plugs for about the first year I had the Vortech on and the car ran quite well. The plugs never fouled even at the lower gap.
Then I changed to the NGK copper racing plugs (V-Power, one step colder). Experimented with those for a couple of months. Again, they performed quite well, no fouling during the trial period.
After that, I put in the IK-24s, which are still in the car now.
All plugs were gapped to 0.034".
Performance wise and by "butt dyno" only, I could not tell the difference from one plug to another. I'm going to stay with the IKs simply because these are the last plugs I bought and they were expensive and they work well. I will check them a couple times a year to make sure they are OK and that my engine is not running consistently lean. I am hoping that these will be the last plugs I buy for my car.
Good luck with your thread. If it truly gets "technical", I will move it to "Technical".
Posted 13 December 2004 - 10:35 AM
This is a little off topic, but I'm curious. . I understand the principles behind using cooler plugs in FI applications, but is there any data available to support this in NA applications? I've been using the IK-24's in the warmer months and IK-22's in my NA 2.2L during the cooler months, but I can't say that I notice any real difference in performance or gas mileage between the two.
"Je n'avais pas besoin de cette hypothèse-là" -- Pierre-Simon LaPlace
"Those who can make you believe absurdities, can make you commit atrocities." -- Voltaire
"... I see it as a very gentle and firm deportation, taking me from the country of the well across the stark frontier that marks off the land of malady". -- Hitchens
Posted 13 December 2004 - 10:53 AM
Posted 13 December 2004 - 10:48 PM
Denso is quiet pround of their U-groove design ground claiming it reduces quenching even further. NGK Iridium doesn't have that feature, nor does the stock. I would say the Denso IK22 is a good stock replacement. The IK24's are probably borderline for NA application and somehow my feeling is they were specifically developed for FI applications given their particularly small gap.
If Denso and NGK intended the IK24 and BKR8EIX for NA applications then why wouldn't they pre-gap them larger. If the iridium biggest selling point is the improved spark and elevated melting point, hence they can generate more heat. Shouldn't the gap be larger then to take advantage of that?
I am not sure my logic is correct though because event the IK22 is pre-gapped to 0.32mm. Could the U-groove be a factor when selecting such a small gap on the Denso?
This post has been edited by Wael El-Dasher: 14 December 2004 - 11:40 AM