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Old 03-03-2007, 04:03 PM
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Location: Ocean Isle Beach, NC
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560SL spark plug gap

Just picked up some NGK plugs to install. The manual calls for a gap of 0.032 inches. Is this what you guys use? I know there is a camp that contends that a larger gap, like around 0.038 or so is better because it gives a stronger spark and more complete combustion. I use a larger gap on my ponton with no problems, but am not that familiar with this engine.

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'59 220S Cabriolet-SOLD and living happily in Malta
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'88 560SL 41,000 miles - totaled and parted out
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'99 E300 turbo 222,500 miles
'03 SLK320 40,000 miles - gave to my daughter
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Last edited by sokoloff; 03-04-2007 at 12:20 AM.
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Old 03-03-2007, 04:09 PM
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I run 42 on all my and my customers 116/117's... It helps improve the idle..more complete combustion down low.

Jonathan
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Old 03-03-2007, 05:21 PM
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Quote:
Originally Posted by sokoloff View Post
Just picked up some NGK plugs to install. The manual calls for a gap of 0.032mm. Is this what you guys use? I know there is a camp that contends that a larger gap, like around 0.038 or so is better because it gives a stronger spark and more complete combustion. I use a larger gap on my ponton with no problems, but am not that familiar with this engine.
I've had good luck over the last 20 or so years running .032, I think they idle just fine and run well. While "in theory" larger gap may aid combustion (hard to quantify these things without dedicated test measures), that gap is going to get real wide (potentially not good) as the plugs wear, unless you plan to change them more regularly. (Rate of electrode erosion also increases with a larger gap, so that's another thing to think about.) There are advantages and disadvantages to running either a higher or lower gap, but my guess is the factory specs suggest a nice balance between the two, my experience would suggest they're right about that. Others will no doubt see it differently.
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Old 03-03-2007, 07:44 PM
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Well, that's one for and one against - who's got the tiebreaker?

Thanks for the input guys.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 222,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 22,500 miles
'14 Smart electric cabriolet 23,500 miles
'15 Smart electric coupe 21,500 miles

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