SUBARU Stock Sparkers Double Platinum?

[82DMC12]

Don't have the part # but they were NGK's, came in a blue and white box, single tip, I think the box said Subaru on it also. The car is 2.5 L, DOHC. The plugs I pulled out where NOT double-tip either. The car is N/A, I don't have the GT with turbo.

Like I said, the originals looked perfect and didn't need to be changed.

Andy



Originally Posted By: ARCOgraphite
How bout brand and part number? Was engine DOHC? The OM and the NGK site shows them as double platinum. STD gap would be 1.1mm which id 43-44mils. I would NOT use IR in the NA motor since the ignition is daul resonant with neagative firing - the IR has too small a center for neg firingh IMO. They are more for reduced misfire with coil-on-plug systems than use relatively "weak" coils. My subarus has dual fire coils like a Ford 302 or Buick 3800.

 

[fdcg27]

Could the 30K recommendation be a result of difficulty in removing plugs left in for a long time?
The flat four is pretty unique, and seems to have some unique issues.

 

[ARCOgraphite]

The only prob I had with the smaller subaru engines is plugs loosening up. Should be no problem, these are long reach plugs and NGK and Denso use trivalent metal plating to prevent seizing. Most all engines are Al heads today. My engine is PZEV and I would think CAL emissions would require warranteed long life plugs.

 

[ARCOgraphite]

Originally Posted By: 82DMC12
Don't have the part # but they were NGK's, came in a blue and white box, single tip, I think the box said Subaru on it also. The car is 2.5 L, DOHC. The plugs I pulled out where NOT double-tip either. The car is N/A, I don't have the GT with turbo.

Like I said, the originals looked perfect and didn't need to be changed.

Andy



Originally Posted By: ARCOgraphite
How bout brand and part number? Was engine DOHC? The OM and the NGK site shows them as double platinum. STD gap would be 1.1mm which id 43-44mils. I would NOT use IR in the NA motor since the ignition is daul resonant with neagative firing - the IR has too small a center for neg firingh IMO. They are more for reduced misfire with coil-on-plug systems than use relatively "weak" coils. My subarus has dual fire coils like a Ford 302 or Buick 3800.


I dont know if you'ld notice if they were double tip - as the GND electrode tip would be a tiny pill or possibly bonded level to the single GND electrode. I'll try to insert the NGK photo. NGK list STOCK plugs as double platinum.

 

[ARCOgraphite]

Here is a the photo of the FR5AP-11 OEM firing tip from the NGK website - this is a Double Platinum plug.

 

[ARCOgraphite]

Originally Posted By: 82DMC12
... The car is 2.5 L, DOHC. The plugs I pulled out where NOT double-tip either. The car is N/A, I don't have the GT with turbo.

Like I said, the originals looked perfect and didn't need to be changed.

Andy

Thanks, good inor the plugs looked fine, Andy. I dont think the legacy came with a DOHC 4cyl engine - just sohc v4 (EJ253) DOHC 6cyl(EZ30D), and EJ255 Turbo ??

 

[Solo2driver]

Every Subaru I've owned (5 of them) have had horribly worn-out plugs, I am assuming from when the previous owners neglected to follow the interval. The cars always ran great after changing the plugs with fresh NGK copper plugs. I just did another plug swap on the Legacy after 30K miles, and they did need changing or at least re-gapping, but not horribly worn out like the ones before with unknown interval.

YMMV.

 

[Eddie]

I used NGK standards in my 2000 Forester and when pulled at 30,000 miles they looked almost new. At one time the factory stated that the 2.5 SOHC engine used Plat for 60K miles but, changed their mind when the new model year came out. I never understood or could figure why.

 

[ARCOgraphite]

Originally Posted By: Solo2driver
Every Subaru I've owned (5 of them) have had horribly worn-out plugs, I am assuming from when the previous owners neglected to follow the interval. The cars always ran great after changing the plugs with fresh NGK copper plugs. I just did another plug swap on the Legacy after 30K miles, and they did need changing or at least re-gapping, but not horribly worn out like the ones before with unknown interval.

YMMV.
I agree in the past that the not-very-good BP(K)R6ES-11 OEM NGK are pretty weak plugs and the dual coil, waste spark ignition would erode the thin GND electrode out fast. OTOH, the stocker Champion that came factory on our 93 impreza trooped on for a good 50K. It was hard (impossible) to find the #8 heatrange champions at the time, and the easy available 9 heatrange didnt run correctly. All my others got NipponDenso K20 PRU-11 with hot-U ground. Now THERE is a excellent copper plug - Slaughters the NGK for a copper plug in the 1.8 - 2.2 litre engines.