Hi Bwings, As I know u're professional in Engine.
I just want to ask you about the spark plug, which will give the Best for the W12 engine...
First is Original One
NGK : PZFR6J-11

Center Electrode Core Material: Copper Core
Center Electrode Tip Material: Platinum
Ground Configuration: Standard
Ground Electrode Core Material: Copper Core
Ground Electrode Quantity: 1
Ground Electrode Tip Design: Standard
Hex Size: 5/8 in
Insulator Height: 50.50 mm
Manufacturer Heat Range: 6
Pre-Gap Size: .044 in
Reach: .75 in
Resistance: 1000 Ohms
Seat Type: Flat
Thread Diameter: 14.00 mm

Second is the Ruthenium one
NGK : FR7BHX-S
Center Electrode Core Material: Copper Core
Center Electrode Tip Material: Ruthenium
Ground Configuration: Standard
Ground Electrode Core Material: Copper Core
Ground Electrode Quantity: 1
Ground Electrode Tip Design: PSPE
Hex Size: 5/8 in
Insulator Height: 50.50 mm
Manufacturer Heat Range: 7
Pre-Gap Size: .032 in
Reach: .75 in
Resistance: 5000 Ohms
Seat Type: Flat
Thread Diameter: 14.00 mm


3rd is Iridium one
NGK : BKR6EIX-11
Center Electrode Core Material: Copper Core
Center Electrode Tip Material: Iridium
Ground Configuration: Standard
Ground Electrode Core Material: Nickel Core
Ground Electrode Quantity: 1
Ground Electrode Tip Design: Taper Cut
Hex Size: 5/8 in
Insulator Height: 50.50 mm
Manufacturer Heat Range: 6
Pre-Gap Size: .044 in
Reach: .75 in
Resistance: 5000 Ohms
Seat Type: Flat
Thread Diameter: 14.00 mm

they looks identical and fit perfectly..
Will the Ruthedium and Iridium will provice much better plug compare with the Platinum one?
Thank you

 

Hello @nguyennhatquang ,
I messaged with BWings, and here is the information he gave me for you.

Johnny

NG,

The best plug to use in the FI version of the W12 (with lower compression and much higher cylinder pressures) is the platinum plug. Cylinder pressure/temperature is the key here.

First, the iridium version - Because the center electrode is so thin and brittle, iridium plug center tips are notorious for breaking off under higher cylinder pressures. In the Corvette world you routinely see iridium plugs from engines with as low as 40,000 miles and will find two or three plugs with missing tips on average (about half or less than the expected 100,000 mile life). When they break off the gap then becomes about .080" (about 2mm), and these are in higher compression (10.7 to 11) NA engines. In a high compression NA engine, it will still fire at .080" but becomes a poor performer at warmups and cold starts, plus that iridium tip went "somewhere". But, in a lower initial compression, but boosted forced induction, the broken tipped plug will be a terrible cold starter and poor performer at low RPM and lower cylinder pressures. So, really NO on iridiums in the FI W12.

Onto the ruthenium plug, these are pretty new technology. If you use it, you will be a pioneer. With ruthenium technology, they realized the weakness of the iridium design and created two versions - the DFE and the PSPE tips. DFE for NA engines and PSPE for FI engines. In your spec NG, you picked the PSPE tip and that part is good. The heat range 7 would be a little bit of a gamble and might cause harder cold starts and poorer performance under unboosted RPMs. Maybe, maybe not. This technology is too new to really tell until someone experiments with it...maybe you, then you can be expert with some miles recorded.

All in all, the platinum is the de facto best and why the factory specced them.

 

@johny : thank Bwings for me... and thank you also..