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Looking for a perfect fit Colder Spark Plug? Look inside!
EDITED WITH ADDITIONAL INFO FROM 1ForcedBenz to correct my screw up on Bosch Heat Scale
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I've tried a couple plugs now with mixed results, and needed to try something new. I came across a great reverse lookup based on specs here: https://www.boschsparkplugs.net/Sear...ptn=Spark+Plug
This returns a range of options, but what we most care about for big power and safety is Heat range 7 or 8 on /NKG scale ( OEM is 6), or in this case a 5 or a 4 on bosch scale ( thanks 1forcedbenz). In my case I was looking for an 7-8 NGK due to turbo upgrades, so a 5 on bosch is a good start. Found this perfect physical match! Hope this helps others out there, since vendors have been ripping people off on plugs for some time now.
This plug is identical to OEM spec in every way. I've used brisk mr12 and was going to go with ngk dilkar8a8. Both of those have the right thread reach and heat range but different tip configuration, hex size and insulator size too small compared to oem. If the insulator is not the right size, the boot it loose, and I don't like that. The mr12s idle like **** since DI doesn't seem to like non projected tip. This plug is identical to OEM fitment and will behave just like OEM, but give you the heat range you need to pull heat away from tip and into the head. If you are making big power this is the one you want.
This plug is identical to OEM spec in every way. I've used brisk mr12 and was going to go with ngk dilkar8a8. Both of those have the right thread reach and heat range but different tip configuration, hex size and insulator size too small compared to oem. If the insulator is not the right size, the boot it loose, and I don't like that. The mr12s idle like **** since DI doesn't seem to like non projected tip. This plug is identical to OEM fitment and will behave just like OEM, but give you the heat range you need to pull heat away from tip and into the head. If you are making big power this is the one you want.
I just checked application list for that spark plugs, they don't really give confidence😂
On 705whp I never experienced any problems. And my tuner also advices to use oem plugs for some reason.
Cool...you can trust your tuner...I prefer research. Heat range 6 on greater than 650 whp is asking for trouble. Going to a colder heat range is cheap insurance against detonation and burning tips off under high boost and heat conditions. You can use this info however you choose 😘
Cool...you can trust your tuner...I prefer research. Heat range 6 on greater than 650 whp is asking for trouble. Going to a colder heat range is cheap insurance against detonation and burning tips off under high boost and heat conditions. You can use this info however you choose 😘
Well, just like how Canada as a country provides nothing new nor is a global leader in pioneering anything relevant these days or ever. Your information is based on Canadian ignorance then, I'm glad your able spout off spec sheets and title a thread so people will get misinformation.
Your comment of "you can trust your tuner" and "I prefer research" just goes to show how pompous and blissful your ignorance makes you.
Most of me wants to not tell you this so you learn the hard way, but what would be the point if I talk ***** and wasn't helpful. So self righteous parts guru, Bosch's heat range numbers aren't the same as NGK or most everyone else's heat ranges, the higher numerically a Bosch plug is the higher the heat range, so a 8 Bosch plug is equivalent to a 6 NGK heat range. MIC DROP
Stick with maple syrup, Canada at least has that market cornered
Disclaimer - Don't take this to seriously...lol... I mean no insult
Last edited by 1ForcedBenz; 06-20-2017 at 07:00 AM.
Good catch...THANKS! I must have been drunk on Drake's maple szzrup drank at the time because I did know that at one point. Happy to eat moose ( that's the canadian equivalent of eating crow) and correct the info. In that case the colder plug is indeed:
That is a 5 on the bosch heat scale, so in between 7 and 8 from what I can tell on the conversion matrix. I will update info accordingly. I'll order a set and report back.
Information sharing, thats what this is all about.
Good catch...THANKS! I must have been drunk on Drake's maple szzrup drank at the time because I did know that at one point. Happy to eat moose ( that's the canadian equivalent of eating crow) and correct the info. In that case the colder plug is indeed:
That is a 5 on the bosch heat scale, so in between 7 and 8 from what I can tell on the conversion matrix. I will update info accordingly. I'll order a set and report back.
Information sharing, thats what this is all about.
That definitely would be the more correct plug heat range your looking for!
EDITED WITH ADDITIONAL INFO FROM 1ForcedBenz to correct my screw up on Bosch Heat Scale
------------------------------------------------------------------------------------------------------------------
I've tried a couple plugs now with mixed results, and needed to try something new. I came across a great reverse lookup based on specs here: https://www.boschsparkplugs.net/Sear...ptn=Spark+Plug
This returns a range of options, but what we most care about for big power and safety is Heat range 7 or 8 on /NKG scale ( OEM is 6), or in this case a 5 or a 4 on bosch scale ( thanks 1forcedbenz). In my case I was looking for an 7-8 NGK due to turbo upgrades, so a 5 on bosch is a good start. Found this perfect physical match! Hope this helps others out there, since vendors have been ripping people off on plugs for some time now.
Material: Platinum
Type: Standard
Shape: Taper Cut
Quantity: 1
Specifications
Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.
Brand: NGK
Heat Range: 8
Even has the correct Copper gasket which should allow for proper indexing following OEM torque specs. I've order a set of these as well and will be trying those first. Will report back.
Just to close the loop. I received and installed the NGK Iridium plugs, and I'm happy to report they were a perfect fit. I removed non projected brisk Silver mr12s plugs, which sucked. They had a dead miss at idle, and would stumble on quick throttle application. DI and non projected tip plugs just do not work! The new NGK's idle dead smooth with excellent throttle response and and no hint of misfire. Exactly what I was looking for with the Extra protection of a heat range 8 plug. This is the one is recommend if you are doing a big power build.
Did you monitor the plug for indexing when installed? I recently installed oem replacement bosch plugs and they didn't index as well as the mercedes branded ones. They ended up about 30° off from the oem ones that I removed. I want to try oem plugs next to see if the extra money gets the proper indexing. Hahaha
Did you monitor the plug for indexing when installed? I recently installed oem replacement bosch plugs and they didn't index as well as the mercedes branded ones. They ended up about 30° off from the oem ones that I removed. I want to try oem plugs next to see if the extra money gets the proper indexing. Hahaha
Only way to truly index the plugs is with the head off and shims. Indexing is not an exact science. You have about 45 degrees of coverage where it's not materially different. That said I just followed OEM torque spec of 14.75ft/lbs WITH NO THREAD LUBRICANT. That should put it in the range of similarity to the stock index
Only way to truly index the plugs is with the head off and shims. Indexing is not an exact science. You have about 45 degrees of coverage where it's not materially different. That said I just followed OEM torque spec of 14.75ft/lbs WITH NO THREAD LUBRICANT. That should put it in the range of similarity to the stock index
I marked the socket and extension with an orange paint pen. I removed the old ones with the mark pointing at the injector (12o clock) and referenced where the plug was. Then I stalled with plug facing the Orange Mark and noted where it ended up after torquing, about 10o clock.
Only way to truly index the plugs is with the head off and shims. Indexing is not an exact science. You have about 45 degrees of coverage where it's not materially different. That said I just followed OEM torque spec of 14.75ft/lbs WITH NO THREAD LUBRICANT. That should put it in the range of similarity to the stock index
06-19-2017, 09:25 PM
