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#1
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Starting to pull my hair out
I have this W114 (130.92 carb engine)for my daughter; it was running well when I bought it. Continued to have good power on test drives.
Belts, hoses, fluids, plugs, fuel filter,etc. Sync'ed the carbs,too. The new plug wires are made by STI. http://www.karlynsti.com/ List price is $130.00. Unlike the Bosch wires with 1,000 ohm resistance per wire, these STI wires have 6,000 ohms resistance. Hmmm. When I replaced the slightly pitted points, the dwell was 48 degrees. Hmmm. For transistorized ignition, 30-32 deg is the spec. Setting the new points to 31 deg dwell, the car has no power OK, set to 40 deg: at least I can make it around the neighborhood without stalling. Next time, I will try 48 deg. dwell. So has does this affect my timing setting. Can I still use the spec, or do I need to make an adjustment? P.S. I put in 1 can of fuel dryer 2 months ago, before filling the gas tank today. The engine ran poorly before and after I filled the gas tank, with a 31 deg dwell.
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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 |
#2
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Ignition timing must be set after setting point dwell.
You have a hybrid ignition on that car -- points that operate a transistor switching unit. Set the points to the correct dwell, then set the timing per the emissions sticker. Pay close attention to the required vacuum line instructions. If you set it with the wrong vac setup, the timing is likely to be way off. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#3
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Taxi, how many miles on the car? Am wondering if dwell settings compensate for timing chain stretch.
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#4
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I'm mostly concerned
about the 6,000 ohm STI wires. The old set was about 3,000 ohm, Bosch makes replacements that are 1,000 ohms, and I decide to buy STI, at 6,000 ohms.
The car probly has 255,000 miles. The Distributor shaft doesn't seem too bad, certainly no worse than my W108.
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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 |
#5
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Spark plug wire resistance?
Just curious, add to my knowledge. If you were running 3000 ohm wires and the OE Bosch is 1000 ohm, why did you decide to use STI 6000 ohm spark plug wires? I am considering new wires and wonder what the advantage of the 6000 ohm wire set is.
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#6
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No advantage with STI
I bought their website 'marketing" hook, line and sinker. 'German Engineering' blah, blah, blah. I wrote to them yesterday, here is the response:
We don't know which wire set # or the exact application you have however most of our wire sets for the older MB do have 6000 ohms per lead. This is essential for the older cars if listening to a car radio without allot of RFI is important to you. As all cars get older all the motorized components have an increase in RFI (Radio Noise Interference). 6000 ohms per lead is a standard resistance to dampen out RFI. That said, it is also impossible to feel any Horse Power difference between a 1200 ohms and 6000 ohms in a lead. Wire sets are just a means by which voltage flows through from the coil to the plugs. If the wires are not leaking voltage, then we believe the problem of you vehicle lies elsewhere. Karlyn Industries Inc. Customer Service Team
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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 |
#7
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The original wires have no ohms [ trace]. They are solid copper core wires and the resistance for RFI is in the spark plug Connector/Resistor Tower. These are 1K or 5K ohms. They mount on the plugs.
The carbon core resistance wires are measured by the length. The longer wire will have more resistance than the shorter wire . That is why Benz did not use them. By using the solid wire/resistor end design, all the plug wires have the same resistance , regardless of length. Wire replacement is simply cut your own to length off a roll of solid copper and screw on the resistor plug connectors and distributor plug ends.The resistors can be checked for uniformity w/ohm meter . This engine likes Bosch Super copper core W8DC. This is slightly hotter than the original W7DC, but the 8s have been found to be best on older engnes with miles on them... |
#8
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Thanks, Arthur
Iwas confused about the WD8 plugs, I initially thought they were colder, not hotter.
See my new post about 'Lessons learned'
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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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