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Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 07, 2023 12:47 pm
by neilbardsley
I installed my MSD this morning. The good news is that it started first time! Now the bad news. I don't appear to have a grey tach wire so I left my tachometer connected to the negative side of the coil but it doesn't work. I'm wondering if this unused spade connector is the tachometer connector and maybe I will need the adaptor?
Next it carries on running after I have turned the ignition off??
Diagram of my wiring included. Any ideas?
The other good news is that I can quickly return to the working setup which doesn't uses the msd
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 07, 2023 1:18 pm
by Lightweight_911
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I think that male spade connector is the 'tach out' terminal - I'd try connecting your rev counter to that & if it still doesn't work you'll need to get hold of a tach adapter.
Did you also change the ignition coil to one of their 'Blaster' coils ?
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 07, 2023 5:52 pm
by neilbardsley
You are correct. I've connected it up but still no luck. I've ordered a tacho adapter.
Now I need a proper way of connecting one spade connector to three others. Looks like this is the answer
On the over running. It appears I need a diode better the ignition and coil/msd to stop the car.
I havent bgt a MSD coil.
Car returned to previous setup runs and rpm works
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sun Oct 08, 2023 8:06 pm
by neilbardsley
I decided to solder the new join I had made to a spade connector. This way I hope to avoid being at the side of the road wondering what wire is loose.
I also found the diode that came with the MSD. I'm glad I bought a more robust one off eBay
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 14, 2023 12:31 pm
by neilbardsley
All working. Just waiting for the cable tidies and hear shields. Maybe they are ugly but I've added wire labels so in the dark, beside a road I can regress to before.
Revs better. Starts better. Proper test drive soon. New spark plugs bought so I can gap them a bit more
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 14, 2023 12:56 pm
by neilbardsley
Little better. Test drive time
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Re: Porsche 914 with Petronix points MSD Install
Posted: Sat Oct 14, 2023 4:12 pm
by neilbardsley
It drove very nice. I had a break and now I gapped, a little wider, some new plugs. Indexed them. IE pointed the opening towards the bottom in valve. It took 6 plugs to find the right one for the first plug.
Time for another test drive
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Re: Porsche 914 with Petronix points MSD Install
Posted: Mon Oct 16, 2023 9:09 pm
by neilbardsley
I thought I would report on the costs. It cost a bit more than I planned.
MSD 6a unit 175.32
Tachometer Adapter 101.36
3way Connectors 7.98
2way connectors 6.99
Diode 5.25
Heat shield 8.99
Bracket 15
Total cost 320.89
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