W111 ignition coil help please - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 05-29-2013, 06:48 AM Thread Starter
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W111 ignition coil help please

My car is a 1966 W111 250SE coupe which now has a 280SE engine which is fitted with the Bosch distributor it came with.

My question is which coil should I fit, there is a ballast resistor fitted in the 12volt feed to the coil (mounted on the inner wing below the coil) which I assume drops the voltage to the coil.
Should I fit a standard 12v coil and connect the cable from the ballast resistor to the + connection, or should I be fitting a ballasted coil?

Does anyone know the specification of the original coil fitted to these cars Bosch part number etc?

Any help appreciated

Cliff
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post #2 of 6 (permalink) Old 05-29-2013, 07:41 PM
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Vehicle: 300sel W109, 280S 70 , 220s 62. 230 66. Lancia Flavia 63.Pininfarina
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The best solution is to get a Pertronix ignitor and matched coil for the 280se .
Ten years in my car.Instant starts and reliability with no points to service.
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post #3 of 6 (permalink) Old 05-30-2013, 02:12 AM Thread Starter
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Thanks for the reply I did look at pertronix ignition as I use it on my 1966 Mustang and have been happy with it its the ballast resistor in the feed to the coil that I am finding difficult to understand.

At the moment I am considering buying a powerspark electrinic ignition kit for the Mercedes to replace the points and condenser and also buying a new coil as well but I am unsure wether to keep the ballast resistor or not.

Should I use a standard 12 volt coil and keep the ballast resistor in the 12 v feed line theoretically supplying the coil at 9 volts or should take 12 volts direct to the coil and not use the ballast resistor at all.
Is there a special coil that should be used with the ballast resistor?

Any advice appreciated
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post #4 of 6 (permalink) Old 05-30-2013, 07:01 AM
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The ballast resistor is a part of a low voltage -9V coil and restricts current,voltage to a safe level for the coil except a full surge when cranking. continuous high 12V overheats the coil so a Ballast resistor is a must.

The 12 V coil requires no ballast resistor being correct voltage and current draw from the cb points. Example the Pertronix ignitor can take a max of 3.5A current so the matching coil has to be 3-4 OHm resistance no ballast required ; if the coil has lower resistance1-2 ohm than the ballast resistor is required with the coil.
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post #5 of 6 (permalink) Old 05-30-2013, 08:08 AM
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swap distributor from the 250 to the 280 and nothing change .by the way , you need to mention the year of the 280 motor , if it is a early , it also has standard ignition , in this case , use the same distributor , the only issue there is the condensor , a standard ignition needs a condensor , a transistor type ignition does not have one , it dose have a radio noise surpressor .
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post #6 of 6 (permalink) Old 05-31-2013, 01:41 AM Thread Starter
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Thanks for the replys guys looks like the pertronix with matching coil may be the way to go
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