Would These Bosch Plugs Work In My 220SE - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 12-12-2013, 07:33 PM Thread Starter
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Would These Bosch Plugs Work In My 220SE

I've got a set of these WR9LS plugs that I think I bought many years ago and had to be for my '65 220SE.
Just got it running again today after many many months of neglect. Needed new points and condenser for now.
Can't find any info so what about it. Thx. Later.

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post #2 of 7 (permalink) Old 12-12-2013, 08:15 PM
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not sure

Quote:
Originally Posted by 50$84sd View Post
I've got a set of these WR9LS plugs that I think I bought many years ago and had to be for my '65 220SE.
Just got it running again today after many many months of neglect. Needed new points and condenser for now.
Can't find any info so what about it. Thx. Later.
Hi Later,

old Bosch designation.
nowadays they only give you parts numbers, so you can't figure out cross references.....
the WR9LS stands for resistor (old radios needed that so it wouldn't interfere)
the WR9LS stands for heat rating or spark strength (9 is kind of hot and for city driving only, or if your motor fouls them up with oil or too much gas, I remember buying 8 or even sevens for my old finnies, that ran decent and didn't oil up))
the WR9LS I think, is for the thread length, Mercedes had longer threads (about 20mm) than Volkswagen plugs (about 10-12 mm).
.
If anybody wants to confirm this or correct any errors, be my guest.
.
.
.
.

Last edited by 6punkt3; 12-12-2013 at 09:03 PM.
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post #3 of 7 (permalink) Old 12-12-2013, 08:26 PM
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Won't swear to it, but I don't think so. I believe 220SE uses W7DC.

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post #4 of 7 (permalink) Old 12-12-2013, 08:38 PM
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Quote:
Originally Posted by 6punkt3 View Post
the WR9LS stands for heat rating or spark strength (9 is kind of hot for city driving only or if your motor fouls them up with oil or too much gas, I remember buying 8 or even sevens for my old finnies)
Could you explain this a bit more, how using a "cooler" plug helps with fouling plugs? What else is affected by this heat rating or more accurately what symptoms help someone know if we should move up or down in the rating? Much appreciated!

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post #5 of 7 (permalink) Old 12-12-2013, 09:01 PM
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better?

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Originally Posted by DirectLA View Post
Could you explain this a bit more, how using a "cooler" plug helps with fouling plugs? What else is affected by this heat rating or more accurately what symptoms help someone know if we should move up or down in the rating? Much appreciated!
You misunderstood me.
I made some corrections above.
I AM NO EXPERT, by far, but what I had been told by different people in parts stores (way back) that a 7 is a normal all around (city and mostly highway plug), an 8 is hotter and for stop and go traffic.
9 I was told is too hot, too strong a spark (?)

I guess to answer your question:
the way I was told and explained :
a hotter plug is like running the car too lean of a mixture. It creates too much heat in the combustion chamber and you're risking a burnt valve (exhaust usually) or worse, the top of your piston melting.
.
Quote:
Originally Posted by GermanStar View Post
Won't swear to it, but I don't think so. I believe 220SE uses W7DC.
sounds about right, I think the W7DC stands for copper (the good old Bosch opper or Plus plug before they started those stupid platinum things).

.

Last edited by 6punkt3; 12-12-2013 at 09:09 PM.
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post #6 of 7 (permalink) Old 12-12-2013, 09:08 PM
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Quote:
Originally Posted by GermanStar View Post
Won't swear to it, but I don't think so. I believe 220SE uses W7DC.
The spark plugs without the resister "R" work much better .Idling and acceleration is better.
W7DC was common on the fintails like 220S.
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post #7 of 7 (permalink) Old 12-13-2013, 07:27 PM Thread Starter
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Thanks guys, that helps.
I do have some oil burning in 4 & 5 cyl. though, so although not a fix I assume these being hotter will help and not foul as fast.
I really don't drive the finny much and not for any long distances so really not about to do any internal work.
Or I guess I could get some plug extenders as those may help equally, thx. Later.

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