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#1
03-01-2004, 04:18 PM
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Proper spark plug gap
Hello,
I have a 1973 280sel 4.5 and I am putting in new Bosch W7DC plugs. Is the proper gap .032"? (That's the recommendation at the Bosch website.) My owners manual says .024". Thanks -Mike 
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#2
03-02-2004, 02:26 PM
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These threads make mention of the W7DC plug:
http://www.peachparts.com/shopforum/search.php?action=showresults&searchid=757187&sortby=lastpost&sortorder=descending The owners manual may be hard to argue with though. I don't understand the difference between it and the Bosch site? Perhaps Bosch was providing a "catch-all" gap that covered many autos using W7DC? Newer electronic models often times idle better with a wider gap. If yours is a points & condenser setup, you might not want to venture too far off the factory recommendation. My 2 cents.
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein" Last edited by Mike Murrell; 03-02-2004 at 02:32 PM.
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#3
03-02-2004, 04:10 PM
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Michael
European cars, historically ( 1960's 70's & 80's, before electronic ignition ) have always had very small plug gaps. If you look at plug gaps for BMW, Mercedes, Porsche, Audi, VW, etc., this has always been the case. For your 1973 model, I would be inclined to either go with the manual specified 0.024" or, you could try a compromise of both, & go in the middle with 0.028". You will know if your car can't handle the wider gap, as you would experience a " tip-in" misfire on new plugs, in fairly short order. 
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2007 C 230 Sport.
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