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Tech Forum : Spark Plug Question

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- BMW E21 Community
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      - Spark Plug Question

g323   Posted Sunday, Dec 17th 11:36am [Edit] [Quote] [IMS] [View car]
Post nr. 50
323i 1982
What is the best spark plug for a 1982 323i? I am using WR8DC right now and I am wondering if i would benifit from using WR7DC as it is somewhat cold right now. Or is there some other plug that would be better?

ArnZ   Posted Sunday, Dec 17th 2:10pm [Edit] [Quote] [IMS] [View car]
Post nr. 37
Qld, Australia
BMW 323i
im using NGK BP5ES which are the standard plugs for my 323i.... works great

i used slighty hotter plugs which were the NGK BP4ES for my old engine which kept fouling up BP5ES spark plugs

bmw_m_320i   Posted Sunday, Dec 17th 5:30pm [Edit] [Quote] [IMS] [View car]
Post nr. 741
Helena, Montana
none right now :(
I always have the best luck with W9DC's on M10/M20/M30's

imaradiostar   Posted Sunday, Dec 17th 8:54pm [Edit] [Quote] [IMS] [View car]
Post nr. 970
Nashville, TN
81 323i, 82 525i, 85 524td, 90 535i
I've seen a lot of bad results with platinum plugs in older bimmer engines. It's zgr5a, bosch silbers or bosch supers in all my old bimmers.


g323   Posted Sunday, Dec 17th 9:13pm [Edit] [Quote] [IMS] [View car]
Post nr. 51
323i 1982
do you recomend zgr5a? or were those the ones that didnt work?

imaradiostar   Posted Monday, Dec 18th 7:01am [Edit] [Quote] [IMS] [View car]
Post nr. 972
Nashville, TN
81 323i, 82 525i, 85 524td, 90 535i
ZGR5A is a normal plug- either silver or copper, I don't recall which. It works great and is often cheaper than the factory Bosch plug.


g323   Posted Monday, Dec 18th 7:54am [Edit] [Quote] [IMS] [View car]
Post nr. 54
323i 1982
Sources then,
BMW_M_320i - W9DC - Bosch
Arnz - BP5ES - NGK
ImaRadiostar - ZGR5A - NGK
Haynes for e21 six cil, N10Y - Champion
Bav Auto - WR8DC - Bosch

I would like to get Bosch, in all reality, how much difference does it make?

Also what does the "heat range" mean, for what reasons would I want a higher heat range, or lower?


ArnZ   Posted Monday, Dec 18th 9:54am [Edit] [Quote] [IMS] [View car]
Post nr. 39
Qld, Australia
BMW 323i
ive used bosch before and i had a good run with them so their not bad plugs. really just upto ur preference to which brand u want, they all pretty much perform the same.

the link below explains a bit about the heat range

spark.asp" TARGET="_blank">

wharthog   Posted Saturday, Dec 23rd 10:04am [Edit] [Quote] [IMS] [View car]
Post nr. 112
SF Bay,California, USA
1982 323i, , R1150RT
When I was wrenching my shop used the Bosch W9DC and NEVER had any problems with them.

Remuxer   Posted Saturday, Dec 23rd 5:28pm [Edit] [Quote] [IMS] [View car]
Post nr. 3
Atlanta GA USA
83 320i
Platinums are horrible for E21s!!! -that did a number on my '82!!! -I've never met a single professional mech that thought a hot plug would improve a old E21 -only foul it up. I stick with Bosch -no problems.. ever, but spark plugs are so good now-a-days you can't go wrong with any brand name that has proper OEM dimension and temperature bias.

Greg323i   Posted Saturday, Dec 23rd 5:37pm [Edit] [Quote] [IMS] [View car]
Post nr. 273
Melbourne, Australia
1982 Hennaröt 323i
Except Champions, which I wouldn't even run in my lawn mower!

Remuxer   Posted Saturday, Dec 23rd 6:21pm [Edit] [Quote] [IMS] [View car]
Post nr. 6
Atlanta GA USA
83 320i
funny you mention Champion -they have cornered the market on 2 stroke lawn maintenance products -I guess that should be a red flag! I now retract my statement encompassing "all" spark plugs -there is something about champion I don't like sort of like Coke versus RC and pepsi. I've always felt the boys at coke just know something that rc and pepsi never will..ofcourse Im from georgia though...

g323   Posted Tuesday, Nov 6th 12:36am [Edit] [Quote] [IMS] [View car]
Post nr. 193
323i 1982

g323   Posted Tuesday, Nov 6th 12:36am [Edit] [Quote] [IMS] [View car]
Post nr. 194
323i 1982
in the end i use WR8DC+ and they work great

chupchup   Posted Tuesday, Nov 6th 1:38am [Edit] [Quote] [IMS] [View car]
Post nr. 262
Is WR8DC the one with built in resistance?

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