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Old 09-14-2004, 11:54 PM
MunichTaxi MunichTaxi is offline
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Join Date: Aug 2004
Location: Western Washington
Posts: 504
Question W108:12 volts for cranking, 6 volts for run?

I have seen a written comment in these forums about the ballast resistors, and the role they perform.
It was written that when cranking the W108, one ballast resistor is bypassed to provide 12 volts to the coil. Then when the engine is running, the bypassed ballast resistor is "allowed" to perform, therby providing only 6 volts to keep the engine running.

So....., why not have 12 volts all the time for the coils use?
Seem like a hotter spark would result in better burning of fuel, and better fuel economy.

Somewhere in this questionable logic is a downside, or maybe even a KABOOM! But I am anxious to hear everyone's comments.
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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