FYI - Failed Denso Irridium Spark Plugs
10-05-2005, 09:59 AM
#31
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Originally Posted by nibble,Oct 4 2005, 04:25 PM
Skip, as I was researching through NGK and other site, I found that 7173 is 1 step colder than our stock. according to their web site, you should increase as per 75 to 100 hp increase. If I remember correctly, I heard that you were putting down 390 hp at the wheel. If so, I believe using 2 step colder spark plug would've been better.
NGK for OEM 2000
part# PFR7G-11S, Stock# 7772. Platinum tip, 14mm, 3/4" reach, 5/8" Hex. heat Rating: 7, Gap 1.1mm (.044")
NGK for 1step colder
part# R5672A-8, Stock# 7173. 14mm, 3/4" reach, 5/8" hex, heat Rating: 8
NGK for 2step colder
part# R5672A-9, Stock# 7405. 14mm, 3/4" reach, 5/8" hex, heat Rating: 9
So, I think it would've been appropriate for you to go with 7405 instead of 7173. I hope someone else can confirm the information I have.
cheers,
NGK for OEM 2000
part# PFR7G-11S, Stock# 7772. Platinum tip, 14mm, 3/4" reach, 5/8" Hex. heat Rating: 7, Gap 1.1mm (.044")
NGK for 1step colder
part# R5672A-8, Stock# 7173. 14mm, 3/4" reach, 5/8" hex, heat Rating: 8
NGK for 2step colder
part# R5672A-9, Stock# 7405. 14mm, 3/4" reach, 5/8" hex, heat Rating: 9
So, I think it would've been appropriate for you to go with 7405 instead of 7173. I hope someone else can confirm the information I have.
cheers,
10-05-2005, 04:50 PM
#32
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I just put a set of IK20s in my car this past weekend. Not sure what the difference is between them and the 22s or 24s. Could someone please tell me if they need to be removed. All this talk to plugs falling apart is scary. Thanks.
10-05-2005, 05:03 PM
#33
Originally Posted by SstoneS2k01,Oct 5 2005, 06:50 PM
I just put a set of IK20s in my car this past weekend. Not sure what the difference is between them and the 22s or 24s. Could someone please tell me if they need to be removed. All this talk to plugs falling apart is scary. Thanks.
10-05-2005, 06:38 PM
#34
xviper,
I think you've got that backwards: the stock heat range for Denso's in a normally aspirated S2000 is IK-24 and the IK-22's are one heat range colder. I'm NOT sure about the IK-20's, but assume they are 2 heat ranges colder than the IK-24's.
From what I remember heat range is a measure of how fast the plug transfers heat from the plug to the head and NOT a measure of how hot a plug actually sparks within the cylinder. That being said I'm running IK-22's here in the Arizona heat. I feel that the plug and head are plenty hot and long as the IK-22's burn cleanly, then reducing the heat transfer (within reason) is to the engine's beneifit.
As always, I'm sure my thinking may be flawed (and it will be pointed out ad-infinitum here), but my car runs strong, no longer exhibits any off throttle down to idle stumbling, and idles smoother with the IK-22's than it did with the OEM plugs.
Sorry to go off-topic (a little) and am crossing my fingers that "my" IK-22's hold up for the next 50,000 miles or so.
I think you've got that backwards: the stock heat range for Denso's in a normally aspirated S2000 is IK-24 and the IK-22's are one heat range colder. I'm NOT sure about the IK-20's, but assume they are 2 heat ranges colder than the IK-24's.
From what I remember heat range is a measure of how fast the plug transfers heat from the plug to the head and NOT a measure of how hot a plug actually sparks within the cylinder. That being said I'm running IK-22's here in the Arizona heat. I feel that the plug and head are plenty hot and long as the IK-22's burn cleanly, then reducing the heat transfer (within reason) is to the engine's beneifit.
As always, I'm sure my thinking may be flawed (and it will be pointed out ad-infinitum here), but my car runs strong, no longer exhibits any off throttle down to idle stumbling, and idles smoother with the IK-22's than it did with the OEM plugs.
Sorry to go off-topic (a little) and am crossing my fingers that "my" IK-22's hold up for the next 50,000 miles or so.
10-05-2005, 07:41 PM
#36
Originally Posted by Gloffer,Oct 5 2005, 08:38 PM
I think you've got that backwards: the stock heat range for Denso's in a normally aspirated S2000 is IK-24 and the IK-22's are one heat range colder. I'm NOT sure about the IK-20's, but assume they are 2 heat ranges colder than the IK-24's.
http://www.sparkplugs.com/results_app.asp?...=1&AAIA=1363104
By your own logic, you should be running IK-24.
10-05-2005, 10:25 PM
#37
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Originally Posted by FF2Skip,Oct 5 2005, 05:57 AM
I have heard the same.Benjiman, you might want to reconsider your choice to sc. It does require attention if you go any higher than a stock kit. Even then, you should be diligent in getting out your car: fluids, plugs, tires, etc.
it's an additional thing i have to think about along with the oil change and i rarely do the work myself as i pay someone to do it for me as my car is not my life.
though i do enjoy the thing.
every 3k for peace of mind... i'll deal.
10-06-2005, 02:49 AM
#38
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If you're going to change plugs every 3k miles, there is no need to spend the money on irridium or platinum plugs. Their only benefit is longevity. In fact some mechanics will use copper plugs as a tuning trick to gain more power.
So use the NGK copper plugs at $2 each rather than the pricey $10+ long life plugs.
So use the NGK copper plugs at $2 each rather than the pricey $10+ long life plugs.
10-06-2005, 04:40 AM
#39
Originally Posted by CoralDoc,Oct 6 2005, 04:49 AM
If you're going to change plugs every 3k miles, there is no need to spend the money on irridium or platinum plugs. Their only benefit is longevity. In fact some mechanics will use copper plugs as a tuning trick to gain more power.
So use the NGK copper plugs at $2 each rather than the pricey $10+ long life plugs.
So use the NGK copper plugs at $2 each rather than the pricey $10+ long life plugs.
10-06-2005, 05:18 AM
#40
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the thing is, it doesn't sound like we forced induction guys have a safe alternative to copper plugs since the iridiums are creating a bit of a mess.
ideally, i want some sort of long lasting plug that's reliable. platinum or iridium. does this long last plug exist for FI S2000s? so the coppers are "cheap"... how's it cheap if you're buying ~30 $2 copper plugs over ~100K miles v. 1 platinum plug at $10? it's WAy more pricey. and on top of that, add in the additional time spent. it's WAY WAY more pricey .
if copper is the ONLY safeish bet, then i'm all right, but not sure we've exhausted the platinum, or some other brand reliable iridium route thus the reason why i'm bringing it up. not ready to "settle" for the copper idea until someone with some info/credibility can say... "there is no platinum/iridium that's safe for FI S2000s"
u feel me?
ideally, i want some sort of long lasting plug that's reliable. platinum or iridium. does this long last plug exist for FI S2000s? so the coppers are "cheap"... how's it cheap if you're buying ~30 $2 copper plugs over ~100K miles v. 1 platinum plug at $10? it's WAy more pricey. and on top of that, add in the additional time spent. it's WAY WAY more pricey .
if copper is the ONLY safeish bet, then i'm all right, but not sure we've exhausted the platinum, or some other brand reliable iridium route thus the reason why i'm bringing it up. not ready to "settle" for the copper idea until someone with some info/credibility can say... "there is no platinum/iridium that's safe for FI S2000s"
u feel me?