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Wed May 25, 2011 6:36 am

Local supply here in Canada seems to be drying up with the WR8AC being substituted. I'm not a fan of 'R' or resistor plugs as I've chased problems with them in the past. The NGK cross keeps coming back as a 'R' plug too.

Are we going to have to change over to higher output ignitions to run these or have I just had a bunch of Bad plugs?

Is the resistor there just to suppress ignition noise so your stereo is cleaner or is there some other function?

Wed May 25, 2011 6:56 am

i think they have discontinued the bosch plugs for our cars. i just cleaned, checked the gap, and threw mine back in.
don't know what a good replacement plug would be, im interested also.

Wed May 25, 2011 7:04 am

Just get NGK B5HS, they will work just fine.

Wed May 25, 2011 9:44 am

Glenn wrote: Just get NGK B5HS, they will work just fine.

the ones I get are B6HS. i think they're a slightly hotter plug.

Wed May 25, 2011 9:49 am

I've managed to locate some of the Bosch plugs thru an industry contact.

I'll be trying some of the NGK's when this source dries up.

I was wondering if Bosch W8AC availability is a local issue or a global thing???

Wed May 25, 2011 9:59 am

JSMskater wrote: Glenn wrote: Just get NGK B5HS, they will work just fine.

the ones I get are B6HS. i think they're a slightly hotter plug.
They're colder.

Wed May 25, 2011 10:05 am

i wont even bother with bosch plugs, just get NGKs

Wed May 25, 2011 3:39 pm

NGK BP6HS has worked well for me for the last 29 years.

Wed May 25, 2011 8:06 pm

Not sure about the W8AC plugs, but the WR8AC plugs should still be readily available. Bosch has introduced this new metal into the mix called Yttrium (whatever the hell that is), and now labeled the plugs "Super Plus". They also have some new BS numbering system. A WR8AC is now crossed over as a #7902. The shop I work at uses the counterpart to the WR8BC, which is a #7903. The #7903 has a protruded electrode that the shop owner feels burns better. I think the resistor plugs have replaced the non-resistor ones. If you need/want the non-resistor ones go with the NGK B5HS (new #4210) Glenn mentioned, or a BP5HS (#4111) for the protruded electrode.

Wed May 25, 2011 8:09 pm

where can i get the ngk B5HS plugs at?? all i can find at advance auto or autozone is BP6HS

Wed May 25, 2011 8:11 pm

I by mine at napa.

Wed May 25, 2011 8:14 pm

i always forget about that place :oops:

Wed May 25, 2011 8:19 pm

Nirvana92 wrote: where can i get the ngk B5HS plugs at?? all i can find at advance auto or autozone is BP6HS

Autozone has them listed on their web site, but they're special order. You should be able to get them within a day, or two. Advance doesn't have a listing on their site, but I would imagine they could get them within a couple of days also. Look for them using NGK's new numbering system as #4210

Thu May 26, 2011 1:59 pm

Sparkplugs.com shows the w8ac as being obsolete too,and I agree NGKs from Napa,they stock all the weird shit.

Thu May 26, 2011 3:16 pm

Also check motorcycle shops they sell them also thats where i get mine
i use the BP5HS work great

Sat May 28, 2011 8:56 pm

Nirvana92 wrote: where can i get the ngk B5HS plugs at?? all i can find at advance auto or autozone is BP6HS

Try Carquest; they bought WorldPac some years ago & usually have decent foreign car parts...

bnc

Sun May 29, 2011 3:32 am

Berg still has them, and several others, listed in their online catalog.

http://www.geneberg.com/advanced_search_result.php?keywords=Spark+Plugs&x=8&y=8

.

Fri Jun 07, 2013 6:50 am

Will w3ac spark plugs do the job? German bosch are hard to come by

Fri Jun 07, 2013 7:54 am

Are these the 14 or 12mm plugs? I need to get some 12mm for my new heads.

Sat Aug 03, 2013 6:18 am

Bashr52 wrote: Are these the 14 or 12mm plugs? I need to get some 12mm for my new heads.

http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf

First digit indicates thread size.
ie: 14mm is B.
12mm could be D, DC or J.

Length is the 'E' or 'H' digit which indicates "3/4" or "1/2".