DIM Electronic Advance Ignition

KitCarlson said
I doubt, the secondary current or voltage will change significantly from the HEI

That'd be fine by me; HEI sets a good, high benchmark for those parameters.

The dwell control might be improved, however I think the HEI does a respectable job with that.

Agreed.

The major improvement will be the accuracy, repeatability and the ability to tune without mechanical adjustments. The base timing will still be manual, with a timing light on balancer at idle. Gone will be centrifugal advance, vacuum dashpot and other related components.

That all definitely works for me!

Timing is done with two simple tables. The RPM table has 10 data points in equal positions from idle to maximum RPM. The idle speed and maximum, are chosen depending on engine requirements. At each RPM point in table, a corresponding timing value is set. The ECU measures RPM, and in a linear fashion, interpolates values in between the data points. The timing based on vacuum is similar.

Okehand how will these tables be accessed? Needs a PC or...?

The mechanical timing advance mechanisms are fairly crude.

You're being unnecessarily diplomatic.

I find it amazing that they in general work as well as they do.

That is pretty amazing, isn't it.

With the electronic system, change and test is easy!

Huge advantage.

The electronic pressure (vacuum) sensor is quite accurate and temperature compensated. The ability to measure RPM is also accurate, based on a clock with a quartz crystal. So, the ignition will be more accurate, predictable and easily tuned.

Very interesting. I'm keen to learn more about that sensor. You've got me wondering if this what you describe could be used to generate a reliable RPM signal for an add-on fuel injection system.