Contact Points vs Electronic Ignition on a Classic

Convert if the car is driven, keep points if the car is judged — and in both cases carry the alternative in the boot.

The honest summary is narrower than either camp usually admits. Electronic ignition removes a service interval and a slow drift in timing. It does not make more power, it does not fix a worn distributor, and it trades a fault you can nurse home for one you generally cannot.

A note on this comparison: this rests on how each trigger works and on the failure modes each one has, not on a conversion fitted here. See how we test.

The short version

Contact points. A mechanical switch that wears. Needs setting, needs replacing, drifts between services — and can be filed, re-gapped and driven home with hand tools.

Electronic ignition. A sensor and module that replace the switch. Holds dwell and timing indefinitely, needs no service, and when it fails it usually fails completely and without warning.

Neither is straightforwardly better. They fail differently, and which failure suits you depends entirely on where you drive.

What actually separates them

Dwell is the thing points lose

The gap between the contact faces sets dwell — how long the coil is connected and charging between sparks. Points erode because they switch current, the gap opens up as they wear, and dwell falls with it.

The consequence is not a dramatic failure. It is a car that was set up correctly in spring and is a little retarded and a little weak by autumn, changing slowly enough that the owner adapts to it. It is also the single most common reason a stored classic is reluctant on its first cold morning — which is why the first drive of the year checklist exists.

Electronic triggering has no wearing contact, so that drift does not happen.

The failure modes are opposite, and that is the real decision

Points give warning. Performance tails off, starting gets harder, and if they do fail on the road the recovery is genuinely a nail file, a feeler gauge and a screwdriver.

An electronic module tends to work perfectly and then not at all, with nothing to adjust. The mitigation is not clever: carry a spare module, or carry the original points and condenser and know how to swap them back.

That is why converting but keeping the old parts is the answer for most people who actually drive their classic any distance.

Neither fixes mechanical wear

If the distributor shaft has play, or the advance mechanism is seized, the spark timing scatters regardless of what triggers it. Fitting electronics to a worn distributor produces a clean, consistent signal into a sloppy mechanism.

Check for shaft play before spending anything. A vacuum gauge will also tell you a good deal about whether ignition is even the problem — the old-school engine diagnostic.

The decision, plainly

• Driven regularly, distances, and you would rather not service the distributor → convert
• Judged, concours, or originality is the point of the car → keep points
• Driven far from home → convert, and carry the points
• Runs badly and you have not diagnosed why → neither yet
• Distributor shaft has play → fix that first

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A conversion kit suits the driven classic. The critical thing is that these are sold for a specific distributor, not for a car — get the distributor identified before ordering anything.

Points and a condenser suit keeping the car correct, and suit the boot of a converted car as the get-home spare.

A dwell meter suits anyone staying with points, because setting dwell properly is what stops the drift being significant between services.

A multimeter remains the more generally useful instrument either way, and is the tool that tells you whether the coil, the leads or the trigger is at fault before you replace any of them.

On the meter itself, the Klein MM400 is the one we would point at: setting points by dwell means working on a running engine, and its published 10 A / 600 V fast-blow fuse on the current jack is the specification that matters when a probe slips somewhere it should not.

The mistake to avoid

Converting to fix a running problem you have not diagnosed. Electronic ignition solves exactly one thing: a mechanical switch that wears and drifts. If the car runs badly for any other reason — leads, coil, a vacuum leak, fuelling, a worn distributor — the conversion changes nothing and removes a variable you could previously check by eye.

The second mistake is throwing the points away. Reversibility is one of the better arguments for converting, and it stops being true the moment the old parts go in the bin. Put them in the boot with a spanner, where they are both a spare and an insurance policy — which is the same logic as the rest of roadside readiness on an older car.