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Old 10-26-2015, 02:13 PM
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Join Date: Dec 2012
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1974 280C Pertronix

I installed the new Petronix ignition system on my 1974 280C which I received from Retro Rockets. If anyone is considering this swap I would highly recommend it. During the process I also installed a new coil with a 1.8 ohm ballast resistor. Prior to the switch the car seemed to surge slightly at 60 mph and it also seemed like the engine really labored when the transmission went to shift between 2nd and 3rd gear. It almost felt like the transmission was slipping. After installing the ignition module and coil it has much more power, the surging is gone, and it powers right through second gear to third. I also disconnected the vacuum advance. I'm running 7 degrees initial advance which gives me 38 degrees total. The entire project took about 1 hour.
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Old 10-26-2015, 04:27 PM
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Location: Houston, Texas
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1962 220Sb ~ The Emerald Bullet
1957 Ponton 220S

2001 S600 Daily Driver
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Old 10-27-2015, 02:35 PM
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Location: Brooklyn, NY/ Minneapolis, MN
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Be advised, if you leave the ignition in the 'on' position for longer than, say, 15 seconds without starting the engine or cycling back to the 'off' position, the unit may burn out.
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Old 10-27-2015, 03:25 PM
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Location: Tucson, AZ
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Another caveat. Do NOT "jump start" the car using a battery charger on "high" settings. The charger can put out up to 17-20 volts which is not good for the unit. Don't ask.
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
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Old 10-27-2015, 08:34 PM
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Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,461
I bought my 1885 Pertronix from RetroRockets. Been on car for quite a number of years now. No problems.

Still haven't installed the Flamethrower coil but do have it as well as the resistors. One of these days....
85 300D,72 350SL, 98 E320, Outback 2.5
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