MSD 6AL-2 Questions - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 6 (permalink) Old 11-18-2012, 02:45 PM Thread Starter
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MSD 6AL-2 Questions

Hello all,

I am ready to make the jump to the MSD 6AL-2 Ignition box.
The questions are - will I need the Tach Adapter 8910 to run the stock tach?
Has anyone had run on problems and needed to use a diode or resistor?

I have an RML distributor and will trigger the MSD using the MSD white trigger wire as RML has recommended.
And I have the stock 1980 electronic tach getting its signal from the negative coil terminal.

One more question too. Since the MSD puts out multiple sparks below 3000 rpm, can you set the timing at idle with a normal inductive timing light?

Thanks,

Peter

Peter
1980 Alfa Spider Veloce (Retro Spica Intake)
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post #2 of 6 (permalink) Old 11-18-2012, 04:44 PM
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I have an MSD6AL on my '79 Spider. It is triggered by a 123ignition distributor. I have the stock tachometer connection - no adapter, resistor, diode needed. I time my distributor at full advance at 4000 rpm and it is fine. I did not notice any funny stuff due to the multiple sparks at lower rpm but I was not specifically looking for anything unusual.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #3 of 6 (permalink) Old 11-18-2012, 06:03 PM Thread Starter
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Thanks Ed,

By "stock tachometer connection" do you mean at the coil negative or from the tach out connection on the MSD. I would think the coil negative connection might be to hot a voltage for the techometer but maybe not.

How do you hold the throttle to 4000 rpm while holding the timing light?
Sorry if thats is a dumb question?

Thanks again,

Peter

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post #4 of 6 (permalink) Old 11-18-2012, 06:30 PM Thread Starter
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I think I have answered my own question. The RML distributor would drive the tach and the trigger input of the MSD. This black wire from the RML would have been connected to the coil negative before installing the MSD box. Now the question would be if the RML has enough capacity to drive both the tach and the MSD box, my quess is yes, but ... Then again the MSD does have a 12 volt square wave tach output that might drive the tach without damaging it.

Thanks,

Peter

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post #5 of 6 (permalink) Old 11-18-2012, 07:37 PM
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My tach wire (yellow or white) is connected to the white wire that goes from the MSD box to the 123 distributor. Does that make sense?

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #6 of 6 (permalink) Old 11-18-2012, 08:15 PM Thread Starter
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Yes, that makes sense. The white MSD wire that goes to the distributor also connects to the white/yellow wire that goes to the tach.

Thanks Ed

Peter

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