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#1
04-24-2010, 02:46 PM
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Red Bosch coil instead of (newer) Silver Bosch?
I have a 1977 280S Grey market that has a carburetor and NO transistorized ignition. The red ballast resistor is 1.8 ohms, but I installed the (newer) Silver Bosch coil, with 0.8 ohms.
Do I need to install the Red Bosch coil, so I achieve a total of 3 ohms in the ignition circuit?
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1970 280S M130 engine- good runner 1971 250 M130 engine- #2 rod bearing, gone 1971 280SE (blown engine,parts car) 1977 German 280S W116-only 33 years old 
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#2
04-25-2010, 01:35 PM
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as I understand it the resistor is to save the points and electronic ignition from premature failure. Did the car never have the electronic ignition box
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD  16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#3
04-26-2010, 12:04 PM
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Melted, I can't be 100%, but all indications show no Transistorized ignition from the factory. This car was in Germany for the first 60,000 km.
The engine stalls when coming to a stop; I am wondering if the incorrect coil resistance is causing low ignition voltage at idle rpm.
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1970 280S M130 engine- good runner 1971 250 M130 engine- #2 rod bearing, gone 1971 280SE (blown engine,parts car) 1977 German 280S W116-only 33 years old
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#4
04-26-2010, 01:57 PM
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its possible , but not probable, will it run at all at idle at all ?
If it stalls only from a stop perhaps vacuum related? Timing ? You certainly can try it , cant really hurt anything
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Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace
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#5
04-26-2010, 10:49 PM
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Sounds familiar. Been there. If it idles fine check timing.
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#7
04-27-2010, 03:52 PM
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The only resistance you need in the primary circuit is the value listed on the label for the coil. When it says 0.9 ohms, or 1.8 ohms, it means exactly that. The coil is designed to operate with this resistance and the points will take care of themselves because the amount of power they see will be regulated by the resistor and the coil operating together. When you start the engine you briefly bypass the resistor for a moment until the engine starts, but once the engine is running the power to the bypass is ended and the normal conditions take over. If you are having trouble after making sure you have the correct components installed, then look at the timing, dwell, vacuum leaks, and carburetor tuning, in that order to ensure you have all the settings right. Advance on to the more difficult things after you have ruled out the simple stuff. You'll save yourself a lot of work that way.
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