No Advance Mechanism!!
Posted: Wed Aug 12, 2026 11:54 pm
...and yet it runs.
The 1967 coupe I'm working on had an aftermarket ignition system that was installed by the P.O. I could not determine the manufacturer of the magnetic trigger, so I replaced it with a Pertronix Ignitor II. Also replaced the MSD 6A. When in the distributor, I noticed all the parts of the mechanical advance mechanism had been removed.
But the car ran and drove pretty well. Now, ChatGPT tells me that neither the MSD nor the Pertronix have any provision for ignition advance. The MSD box failed, so I removed it and I'm running with just the Pertronix Ignitor II and coil.
I'm grappling with a dodgy timing light to see how much advance I'm missing.
How is this engine able to rev beyond 2000 rpm with no mechanical advance?
The 1967 coupe I'm working on had an aftermarket ignition system that was installed by the P.O. I could not determine the manufacturer of the magnetic trigger, so I replaced it with a Pertronix Ignitor II. Also replaced the MSD 6A. When in the distributor, I noticed all the parts of the mechanical advance mechanism had been removed.
But the car ran and drove pretty well. Now, ChatGPT tells me that neither the MSD nor the Pertronix have any provision for ignition advance. The MSD box failed, so I removed it and I'm running with just the Pertronix Ignitor II and coil.
I'm grappling with a dodgy timing light to see how much advance I'm missing.
How is this engine able to rev beyond 2000 rpm with no mechanical advance?