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Carbon vs. Platinum Spark plugs #5347010 02/11/20 09:41 AM
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Omar_Eltahan Offline OP
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I have a chery A5 with chery SQR484F 2.0 L engine installed. it replaced the original chery SQR481FF 1.6 engine.
car's manual stated that suitable spark plugs for the original engine is FR7DTC which is Bosch made (Carbon). this spark plug's Gap is 0.8mm and its heat range is 7 (Bosch standard) with resistor 6K Ohm.

i want to try platinum ones, as life span is much longer (60.000 km vs. 20.000 km) and as far as i know spark is more accurate.
so i made a research and finally found Bosch 6724 FR7DPP30X
Gap: 1.1mm
Heat Range: 7
with resistor 6K Ohm.
https://www.boschsparkplugs.net/product.aspx?zpid=27961

and its equivalent NGK 7092 BKR6EGP (BKUR6EGP)
Gap: 1.0mm
Heat Range: 6
with resistor 5K Ohm.
https://www.ngk.com/product.aspx?zpid=9329

Gap can be modified easily to match 0.8mm and heat range 6 in NGK is the same 7 for Bosch. both are same measurements of the Carbon one.

my question is: am i going to face any problems replacing Carbon with Platinum??
also what's the difference between 6K & 5K Ohm resistors?? is it safe to use the 5K Ohm NGK?


2012 Chery A520 2.0 L

Engine:Castrol Magnatec 10w40
Transmission: Mobile ATF 320 (Dexron III)
Brake:Castrol DOT4
Power Steering: Mobil ATF 220
Radiator Coolant:Mobil HOAT 33% EG
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347016 02/11/20 09:45 AM
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CT8 Offline
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Use which ever type of spark plug was oem.


2015 F150 2.7
2018 F350 6.2
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347017 02/11/20 09:45 AM
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Rand Offline
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I think you mean Copper Spark plug not carbon?


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347077 02/11/20 11:14 AM
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DrDanger Offline
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Denso and NGK are reputable internationally available brands of good quality and reasonable price. Get an Iridium or Ruthenium tipped plugs, you wont regret it.

In case you want to read up as to why: https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5322738/spark-plug-tips#Post5322738

Denso and NGK have part catalogues on their websites, which will give you the right part number for your car.

Last edited by DrDanger; 02/11/20 11:16 AM.
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347195 02/11/20 01:28 PM
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First off, you should try to keep the same heat range so you don't get into problem, that's unless you know what you are doing and run a different heat range to address a problem (in racing or in an engine with issues).

If you want to try a different plug, try to get the same or smaller diameter and gap size. You may pick a larger gap size with a smaller diameter plug tip electrode (dielectric strength equation, surface area is inversely proportional to distance), but I personally prefer not to adjust fine wire precious metal plug gap because I don't want to break them.

The resistance is there to suppress noise, 5k vs 6k should be reasonably close as it is only 20%. If you have noise in the radio right after changing plugs, you know why. Keep your old plugs until you know the new plugs are working fine.

Last edited by PandaBear; 02/11/20 01:31 PM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Carbon vs. Platinum Spark plugs [Re: CT8] #5347203 02/11/20 01:42 PM
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Omar_Eltahan Offline OP
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Originally Posted by CT8
Use which ever type of spark plug was oem.


I'm afraid i don't understand.


2012 Chery A520 2.0 L

Engine:Castrol Magnatec 10w40
Transmission: Mobile ATF 320 (Dexron III)
Brake:Castrol DOT4
Power Steering: Mobil ATF 220
Radiator Coolant:Mobil HOAT 33% EG
Re: Carbon vs. Platinum Spark plugs [Re: Rand] #5347204 02/11/20 01:42 PM
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Omar_Eltahan Offline OP
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Originally Posted by Rand
I think you mean Copper Spark plug not carbon?


yes, my mistake


2012 Chery A520 2.0 L

Engine:Castrol Magnatec 10w40
Transmission: Mobile ATF 320 (Dexron III)
Brake:Castrol DOT4
Power Steering: Mobil ATF 220
Radiator Coolant:Mobil HOAT 33% EG
Re: Carbon vs. Platinum Spark plugs [Re: DrDanger] #5347207 02/11/20 01:45 PM
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Posts: 57
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Omar_Eltahan Offline OP
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Posts: 57
Originally Posted by DrDanger
Denso and NGK are reputable internationally available brands of good quality and reasonable price. Get an Iridium or Ruthenium tipped plugs, you wont regret it.

In case you want to read up as to why: https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5322738/spark-plug-tips#Post5322738

Denso and NGK have part catalogues on their websites, which will give you the right part number for your car.


I'll read carefully, but why you don't recommend Bosch?
just curious to know.


2012 Chery A520 2.0 L

Engine:Castrol Magnatec 10w40
Transmission: Mobile ATF 320 (Dexron III)
Brake:Castrol DOT4
Power Steering: Mobil ATF 220
Radiator Coolant:Mobil HOAT 33% EG
Re: Carbon vs. Platinum Spark plugs [Re: PandaBear] #5347211 02/11/20 01:53 PM
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Omar_Eltahan Offline OP
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Originally Posted by PandaBear
First off, you should try to keep the same heat range so you don't get into problem, that's unless you know what you are doing and run a different heat range to address a problem (in racing or in an engine with issues).

If you want to try a different plug, try to get the same or smaller diameter and gap size. You may pick a larger gap size with a smaller diameter plug tip electrode (dielectric strength equation, surface area is inversely proportional to distance), but I personally prefer not to adjust fine wire precious metal plug gap because I don't want to break them.

The resistance is there to suppress noise, 5k vs 6k should be reasonably close as it is only 20%. If you have noise in the radio right after changing plugs, you know why. Keep your old plugs until you know the new plugs are working fine.


Thank you for the Ohm information.

as for the plugs, both NGK & Bosch models i listed are identical to the manual's recommended copper plugs in everything, except for the gap which can be adjusted easily with below tool:

[Linked Image from cdn.gsparkplug.com]

so as for heat range the copper from Bosch is 7, same for Bosch's platinum ones, 7 for Bosch equals 6 in NGK which is the one in the model i listed.


2012 Chery A520 2.0 L

Engine:Castrol Magnatec 10w40
Transmission: Mobile ATF 320 (Dexron III)
Brake:Castrol DOT4
Power Steering: Mobil ATF 220
Radiator Coolant:Mobil HOAT 33% EG
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347215 02/11/20 02:00 PM
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PandaBear Offline
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Don't use that tool to adjust platinum, iridium, rhodium plugs, they can crack the fine wire tip. When you are going from copper to these rare earth / precious metal plugs, you will notice that the tips are now a lot smaller, and therefore don't worry about the plug gap anymore. 0.8mm vs 1.1mm is not a big deal if you go from the wider copper plug to fine wire platinum / iridium / rhodium. Don't go the opposite way though, the ignition will not like it.

Last edited by PandaBear; 02/11/20 02:01 PM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347236 02/11/20 02:24 PM
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sohccammer427 Offline
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It's perfectly ok to up grade to a newer technology when replacing plugs as long as they are the correct part for the application.

copper/nickel -> platinum -> double platinum -> iridium -> ruthenium

Downgrading is probably not a good thing.

(if you're doing nitrous injection, skip platinum)


2015 VW Passat TDi 6 Speed Manual
2017 Colorado Duramax
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347262 02/11/20 02:43 PM
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Ded Mazai Offline
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You may try platinum spark plugs but I think you need to do deeper research if other people had problems. If your car has a waste spark ignition system than you may have troubles. It looks like your OEM spark plugs are not usual ones. There could be a good reason for that. [Linked Image]


BRZ | M1 HM 5W-20, FU | PZ Synchromesh.
Re: Carbon vs. Platinum Spark plugs [Re: Ded Mazai] #5347305 02/11/20 03:26 PM
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PandaBear Offline
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Originally Posted by Ded Mazai
You may try platinum spark plugs but I think you need to do deeper research if other people had problems. If your car has a waste spark ignition system than you may have troubles. It looks like your OEM spark plugs are not usual ones. There could be a good reason for that. [Linked Image]


These fancy side electrode plugs are now obsoleted. The same can be done with double platinum for a better flame for the same mileage, they were invented back when platinum was too expensive to use.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347420 02/11/20 05:25 PM
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ARCOgraphite Offline
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I would go with a K20PRU-11 Denso copper in place of that bosch, but the bosch copper is a quality plug

The bosch heat range is a bit cold for a 7 unless you work the engine real hard.

NGKBKR6ES-11 tend to overheat their GND electrode.

I Know as it is the STD plug in most Toyota and Subaru and Suzuki from 15 - 20 years ago.

Tried 'em all in many of my cars and customers cars.



[Linked Image]


2019 VW Jetta S 6MT OCI#2 7378mi-MOTUL Specific VW508.00+VW Service Filter; '17 Subaru Crosstrek CVT OC#8 60864mi-Subaru Idemitsu 0W20 + SOA Filter
Re: Carbon vs. Platinum Spark plugs [Re: Omar_Eltahan] #5347463 02/11/20 06:11 PM
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benjy Offline
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exotic metals used in todays spark plugs are for long life NOT performance so unless plugs are to hard to DIY use standard plugs as i do in my 2001 1.8T audi TT 225Q

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