Replacing a contact ignition system with a contactless one is not a problem today - there would be money and desire.


For the owners of “cents” and other “classics”, the market offers both ready-made distributors with a Hall sensor, and separately mentioned sensors complete with special impellers that specify the moment of sparking. With the choice of an electronic switch, there are also no difficulties - they are enough for every taste.

We note, however, that the light did not converge on the “Hall” - the photo shows ignition systems with infrared sensors. A brief pedigree of such products is set out in our help.

The Moscow version of the implementation of the “infrared” ideology “Booster-3” contains a sensor and a screen installed inside the distributor instead of the standard breaker, as well as an electronic switch - it is mounted in the engine compartment. On the screen - four slots of 30 ° each. At the moment of passage of the slot through the gap of the sensor, a signal appears at its output, which “orders” the switch to abruptly interrupt the current through the coil - here a spark arises. In short, we have before us the simplest non-contact electronic ignition system.

St. Petersburg "infrared" do the same, but much more spectacular, because there is no screen, no separate switch in their compact product. He removed the contact group, installed the Sonar-IR instead, and that’s it - the ignition is ready. Instead of a rotating screen, here is the “square” profile of the standard roller of the ignition distributor, which interrupts the infrared beam with its “corners”. Original …

Checking “Booster-3” and “Sonara-IK” at the stand did not bring any sensations. Their electrical parameters approximately correspond to the usual "classics", only the secondary voltage rise rate is slightly higher, and the rupture current is slightly lower, but in general it is the same. There are also advantages: stable operation at low crankshaft rotational speeds, as well as when the supply voltage drops to about +6 V. Non-contact sensors unload the distributor bearing, are not afraid of moisture and do not need maintenance. But about reducing fuel consumption and reducing the level of CO, promised by Muscovites, it’s not worth it to flatter yourself - it is rather from the field of advertising.

A certain advantage of the Booster over the Sonar is a rotating screen, which allows you to forget about the age of the regular distributor roller. If we assume that the profile of a worn out (and maybe even new) roller has geometric flaws, then the Sonar optoelectronic sensor will blindly repeat them. The rest of the St. Petersburg product is much more modern and convenient. The built-in LED indicator facilitates the installation of the Sonar on a car - when installed correctly, it starts to flash from red to green: clearly and conveniently.

It is a pity that manufacturers did not use the trump card of their products in any way - their non-standard nature. Hint to the developers - the simplest refinement of circuitry can turn the Booster or Sonar into an original and inexpensive "anti-theft" …

Booster-3 ignition parameter optimization system.

Manufacturer: Moscow Electromechanical Plant No. 1. Price - 8 oz. e.

Contactless electronic ignition "Sonar-IR".

Manufacturer: Demetra company (St. Petersburg). Price - 8 y. e.

Our reference

Generally speaking, a CONTACTLESS SENSOR can be any converter for turning the crankshaft into an electrical signal. Known induction generator sensors "Bosch", magnetoresistive sensors "Siemens", sensors with a high-frequency generator "Lucas", optoelectronic sensors "Motorola". Car enthusiasts with experience remember the once popular BESZ-1 system, in which there was a proximity sensor with a high-frequency generator. However, the Hall sensor almost completely replaced all the others from our market. Apparently, this is explained by the principle of "they do not seek good from good." The reliability of mass-produced “halls” has finally reached its design value, and you can purchase them everywhere.

Let's try to objectively compare the optical