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Any down side to 1 step colder plugs?

 
Old 04-17-2019, 09:02 AM
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CLS 55 AMG E500 99 ML320
Any down side to 1 step colder plugs?

I've got to do plugs this weekend and I was thinking about going 1 step colder in view of future mods. If I don't have time for the mods this year, should I just go with stock. I found ILFR6A NGK (stock) on amazon for $10 each. Thoughts?
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Old 04-17-2019, 10:35 AM
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2005 E55
Colder plugs pass heat better. The tips stay colder and reduce the chance of pre ignition in highly modified cars. But because they stay colder in normal operating conditions the tips foul faster, and they need to be thoroughly put through their paces often to be heated enough to keep the tips clean. Low lifespan.

IMO I would only go colder if you were very highly moded and could tell based on tracking timing that you were getting some knock retard. I think a lot of folks go to colder plugs a little too soon around here.

One of the tuners I chatted with said he started seeing some timing loss from detonation upwards of 600whp on stock plugs before going colder.
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Old 04-17-2019, 11:13 AM
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Great info! Thanks! I'll go ahead and order the stock ones. Forget to ask about a plug wire tool. I've never even seen one.
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Old 04-17-2019, 12:16 PM
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Originally Posted by StarvingArtist View Post
Great info! Thanks! I'll go ahead and order the stock ones. Forget to ask about a plug wire tool. I've never even seen one.
I havenít done plugs yet but Iíve removed the wires to do gaskets a couple times. People mention a boot tool for them but Iíve had no problems just using an open- ended wrench, I believe 11/16 to leverage against the head and pop them off no problem.
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Old 04-17-2019, 12:20 PM
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With added boost, colder plugs are good insurance and some notice a slight rougher idle. drivers rear plug is a little tough to get to and you may need a few extensions or swivel heads.
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Old 04-17-2019, 10:17 PM
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CLS 55 AMG E500 99 ML320
Originally Posted by Exotic-metal55 View Post
With added boost, colder plugs are good insurance and some notice a slight rougher idle. drivers rear plug is a little tough to get to and you may need a few extensions or swivel heads.
Ok thanks, I'll do that one first and the rest will seem easy
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Old 04-17-2019, 10:34 PM
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Originally Posted by Jake528 View Post
I havenít done plugs yet but Iíve removed the wires to do gaskets a couple times. People mention a boot tool for them but Iíve had no problems just using an open- ended wrench, I believe 11/16 to leverage against the head and pop them off no problem.
AAAHH the wrench trick. Forgot about that one. I think I did that with my wife's E.
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Old 04-18-2019, 07:31 PM
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Just a little FYI. A colder plug will help prevent detonation by pulling heat out. Yes. And it's great for the street where temps constantly change. But........you want to keep as much heat in the chamber as possible with out detonation issues. Thermal barrier on piston tops is a perfect example of this. Thermal energy ... controlled energy, is how you make power.
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Old 04-19-2019, 08:04 AM
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I've never heard of a thermal barrier on a piston before. What is that all about.
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Old 04-19-2019, 09:56 AM
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Old 04-19-2019, 09:58 AM
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Reflects heat right back into chamber and not into the piston. I do this on all my pistons.
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Old 04-20-2019, 06:10 AM
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Wow, even looks cool. Some kind of ceramic coating?

Plugs are here. I forgot to ask about the gap?? I've got to work all weekend anyway to finish a job.
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Old 04-20-2019, 05:32 PM
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I just use a 17mm spanner to get the boots off...always seemed to be super easy to me but maybe I am damaging them lol dont think so though..
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Old 04-20-2019, 09:52 PM
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Anybody know what the gap should be? Normally I just leave them alone, but this car gets the attention to detail.
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Old 04-20-2019, 09:59 PM
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You shouldn't be gapping anything mate. Pretty sure its 0.032" but the plugs you got shouldn't require adjustment. I brought the NGK one step colders and just slapped them straight in. Hasn't ****ed out in 30,000 miles of absolute hell (must be at least 6 sets of rear tyres) must be good!
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Old 04-21-2019, 08:33 AM
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OK thanks.
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Old 04-21-2019, 10:10 AM
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Check the gap....you never know and it will be "perfect" piece of mind when done if you are detail oriented !!
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Old 04-21-2019, 03:26 PM
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if your not running huge amounts of boost and high timing you don't need colder plugs as the stock 2 per cylinder do very well.
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Old 04-21-2019, 05:42 PM
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Yeah I am going back to stock plug I sick of my idle being cheap and nasty not amg smooth but probably not plugs fault.
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Old 04-21-2019, 09:10 PM
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Originally Posted by PieRat View Post
You shouldn't be gapping anything mate. Pretty sure its 0.032" but the plugs you got shouldn't require adjustment. I brought the NGK one step colders and just slapped them straight in. Hasn't ****ed out in 30,000 miles of absolute hell (must be at least 6 sets of rear tyres) must be good!
Thats actually what will make them last haha Driving like a grandma will wreck colder plugs.
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Old 04-25-2019, 08:23 PM
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Put the plugs in today. HUGE difference! I guess I let that bit of maintenance go too long. No more misfire, More responsive, more power. The gap of the new plugs was .031, I left it that way. I set off the check engine light stomping on it last Tuesday, I hope it goes out with a couple key cycles.
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