Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: rmmchl on February 03, 2008, 13:10:35

Title: spark plugs 250 sl
Post by: rmmchl on February 03, 2008, 13:10:35
what are the correct plugs and gap
Title: Re: spark plugs 250 sl
Post by: Raymond on February 03, 2008, 15:23:26
Bosch W7DC .9 mm (.035 in) is the short answer.

Do a search for Spark Plugs.  There is about everything you could want to know about the plugs for these cars.

Ray
'68 280SL 4-spd Coupe
Title: Re: spark plugs 250 sl
Post by: Benz Dr. on February 03, 2008, 15:41:40
I won't use W7DC - they're too cold on all but the best engines. This plug was intended for when the engine was new and doesn't work well on rich running or lower compression engines. I use W9DC0 for everything these days.

Dan Caron's
 SL Barn
benzbarn@ebtech.net
 slbarn.mbz.org
  1 877 661 6061
Title: Re: spark plugs 250 sl
Post by: 66andBlue on February 03, 2008, 16:48:38
Hi Dan,
what is the difference between a W9DCo and a W9DC?

Alfred
1966 blue 230SL automatic
Title: Re: spark plugs 250 sl
Post by: Richard Madison on February 03, 2008, 17:07:34
Perhaps this Spark Plug nomenclature chart will be helpful.

Richard M

Download Attachment: (http://images/icon_paperclip.gif) sparkplug.jpg (http://www.sl113.org/forums/uploaded/280sl71/2008231877_sparkplug.jpg)
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Title: Re: spark plugs 250 sl
Post by: Bob G ✝︎ on February 03, 2008, 20:55:55
What plug is the equivlant in the NKG line for a 280SL with 90,000 miles?

Bob Geco
Title: Re: spark plugs 250 sl
Post by: 66andBlue on February 03, 2008, 23:08:02
quote:
Originally posted by 280SL71

Perhaps this Spark Plug nomenclature chart will be helpful.

Thanks Richard.
It is quite helpful - now I know that the "zero" stands for "special shell or electrode" - but perhaps what I should have asked the good doctor was why the difference between a W9DC ad a W9DC0 is significant and/or important.

Alfred
1966 blue 230SL automatic