Marelli S73B and Pertronix - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 5 (permalink) Old 05-07-2016, 09:59 AM Thread Starter
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Marelli S73B and Pertronix

In another thread there was a brief discussion of the Pertronix MR143 suitability. It worked for me and a few others, but Barry Frantz reported troubles. He later wrote to me that he sent his MR143 equipped S73B back to Pertronix, who told him "it was all wrong", fixed something, and sent it back. It is now working correctly.

As I did mine before Pertronix officially blessed this application, I sent mine back to them to check the phasing, and they reported it all works perfectly. It has, indeed, been working fine on my car, but I wanted to be sure the rotor was where it was supposed to during the firing event, instead of just a little off.

I also sent them the Bosch distributor originally fitted to the FNM, and they have identified a kit that I can use on it, which is their 1847A.

So - not sure what Barry's problem was, but it was not apparently with the Pertronix kit.

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #2 of 5 (permalink) Old 05-08-2016, 04:08 AM
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Hi Don,

The Pertronix adds state that MR-143 is for negative ground cars and that kits are available for positive ground cars. Do you know the difference between the two?

Doug
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post #3 of 5 (permalink) Old 05-08-2016, 07:06 AM Thread Starter
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Perhaps some Giuliettas were positive ground, so the MR143 would not work on them.

So far as I know, I was the first one to try an MR143 on the S73B. It was originally catalogued for the the S73A, which is a Giulitta distributor, and I just bought one and gave it a whirl. Worked fine.

Or cars are, of course, negative ground, so no worries.

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
DPeterson3 is online now  
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post #4 of 5 (permalink) Old 05-10-2016, 03:03 AM
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I think I have been hanging around the 750 guys too much.

Doug
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post #5 of 5 (permalink) Old 05-10-2016, 06:07 AM
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The Marelli S73A was fitted to Giulietta Sprint/Spider Veloces,SS's and SZs,all negative ground from the factory.
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