Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

EJ20G Spark plug difference?


  • Please log in to reply
6 replies to this topic

#1 rxleone

rxleone

    Subaru Fanatic!

  • Members
  • 528 posts
  • Christchurch, New Zealand

Posted 16 December 2012 - 07:07 PM

Going to change the spark plugs in the girlfriends 90' Legacy GT (4EAT, EJ20 turbo). I know you stateside guys didn't get this motor, but I did some checking at the parts store and they say the motor takes NGK BKR6EIX Iridiums, which are about five times more expensive per plug then standard V-Powers.

I was going to use just the standard V-Powers. I take it you just drop the IX at the end of the part number to become BKR6E. Are regular NGK plugs okay to use?

I figure the iridiums are just a bit of a marketing ploy or last a bit longer to save changing them too often in a DOHC motor, but I'm not fussed about changing them more often. Are the standard plugs just as good to use?

Edited by rxleone, 16 December 2012 - 08:59 PM.
typo


#2 89Ru

89Ru

    Eat, Live, Breath Subaru

  • Members
  • 363 posts
  • Nashville TN

Posted 16 December 2012 - 08:53 PM

I can't speak for iridiums. Perhaps they are better than platinums. I have not been impressed with platinum plugs in the EJ22 (not OEM) OR double platinums in the EJ25D (OEM). They wear unevenly and after 80km they should be inspected if not sooner. I have seen coppers go 120km and still be evenly worn (EJ22). I think the advice I have been given to stick with copper makes sense, they are cheap and just replace them after 50km. Several recent posts on this subject. Yes all these mileages are in km's not miles. Its been a while since I have seen the southern cross...hope to get back in the southern hemisphere soon.

#3 Fairtax4me

Fairtax4me

    Su bah roo'n

  • Gold Subscribers
  • 8,747 posts
  • Charlottesburg, VA

Posted 16 December 2012 - 11:26 PM

BKR6E-11 is the V power copper plug with the same heat range. They'll work just fine, but you may need to re-gap them after 15 or 20 thousand miles.
Spark doesn't jump the plug gap quite as easily with higher cylinder pressure that the turbo creates. This is overcome by closing the gap a bit, but as the plug wears the gap widens and can cause misfire issues under boost.
The iridium tip plugs are more resistant to this problem over the long term, but they cost about 3-4 times as much.

If you don't mind pulling the plugs every now and then, standard copper should work just fine.

#4 rxleone

rxleone

    Subaru Fanatic!

  • Members
  • 528 posts
  • Christchurch, New Zealand

Posted 17 December 2012 - 03:22 PM

Thanks for that. Learn something new every day.

#5 torxxx

torxxx

    I void warranties

  • Members
  • 2,914 posts
  • Fairbanks

Posted 17 December 2012 - 03:27 PM

put V-Powers in it and be done with it. Iridiums are a waste of money. Got tricked into buying them for my SVX a few years ago = random misfires. Put cheap V-powers back in it = misfires gone

#6 Legacy777

Legacy777

    Moderator

  • Moderator
  • 12,607 posts
  • Houston, Tx

Posted 18 December 2012 - 12:36 PM

The reason they call for the iridiums is because the plugs on that motor are a pain in the butt to change, so Subaru calls for plugs that last longer. You can use the standard v-power plugs with the knowledge that you may need to change them more frequently.

#7 rxleone

rxleone

    Subaru Fanatic!

  • Members
  • 528 posts
  • Christchurch, New Zealand

Posted 18 December 2012 - 02:53 PM

The reason they call for the iridiums is because the plugs on that motor are a pain in the butt to change, so Subaru calls for plugs that last longer. You can use the standard v-power plugs with the knowledge that you may need to change them more frequently.

I've never really had a problem changing plugs on a DOHC motor, maybe because my hands aren't too big. Doesn't bother me changing them every 30,000km or so, that's only about once every two years anyway.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users