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HIGH VOLTAGE SEMICONDUCTORS

High voltage wires are divided

on ordinary and special - as it is written in the textbook.

Mikhail KOLODOCHKIN

Auto electricians use a different terminology - wires are normal and bad. On the Volga with the 406th engine, a bad wire can do so many things that Hitchcock will envy. Candles are installed here in special "wells" - between two camshafts. Therefore, the "Volga" wire consists of two parts - the actual wire and the tip. In the early 90s, these tips were porcelain. Just a little - a piece of porcelain falls to the bottom of the "well", from where, sooner or later it will fall into the cylinder. You can not explain further.

Today, plastic tips are used (photo 1). Resistance is installed inside to reduce radio interference. It became more convenient to mount them, but the insulation is noticeably inferior to porcelain and often "breaks into the case." As a result, high-voltage discharges run not where we would like, but to where the path to the "mass" is shorter. To this they are provoked by ugly wires that are afraid of moisture and crack in the cold. I don’t want to talk about the tips of the era of industrialization.

The ignition coil is the first to suffer. In the best case, the contact in its high-voltage socket is simply broken, and in the worst, a “breakdown” occurs on the primary winding - then goodbye, control unit. It is not surprising that in the car service they rush at the earliest opportunity to replace regular wires with normal ones - there are no "semiconductors" here. But which ones?

For testing, we managed to purchase six sets of wires. We estimate the mechanical properties of the wires by the magnitude of the force required to disconnect from the ignition coil output - it should be from 20 to 70 N, and also by the force of contact detachment from the wire, which should be at least 62 N. Then the wires will have to travel from the refrigerator to the stove and back - first they are waited for three hours at minus 40 ° C, then three hours at plus 100 ° - and so three times. We will check the electrical parameters on a three-electrode spark gap at sparking frequencies of 25 and 150 Hz. “Water procedures” will take four days at + 40 ° C and a humidity of 95%. In addition, we redeem wires in gasoline and mineral oil. In general - full Disneyland.

The test results are shown below. It is curious that all the wires managed to withstand the effects of temperature loads, were not afraid of either oil or gasoline, and also confidently ensured the transmission of high voltage pulses and transferred vibrational loads.

No. 1. Set LEMARK HOTWIRES (England). I would like to buy for only one appearance - a solid package plus unusual adapter tips that can be transformed to different depths of "wells". (However, will the owner of the Volga need this quality?) The adapter is equipped with a “hat”, for which it is easy to pull it out, but the “well” itself is not closed in the best way. The plastic is rather fragile and if, God forbid, crack, then its fragments will sooner or later fall into the cylinder.

The connectors are chrome-plated - you can not be afraid of oxidation. The force of their separation from the wire is 120 N - this is a double margin. The wire sits tightly on the coil - the disconnecting force is 48.5 N. The electrical resistance of the wires from the set ranged from 6.055 to 7.17 kΩ, depending on the length. After “moisture”, the range shifted down to 5.5–7 kOhm, and after thermal cycles it rose a little - to 5.8–7.1 kOhm.

The price of the kit is 450-600 rubles.

The overall impression is not bad, but a little "unfinished."

No. 2. High-voltage wire harness of JV Packard Electric Systems (Samara).

Samara wires look suspiciously beautiful - upon closer examination, it turns out that they are made of components of the American company DELPHI Automotive Systems.

The lock of the connector is made in the form of an extrusion, and the shank has teeth - both of them are done correctly (photo 2). Therefore, the wire firmly clings to the coil socket (the separation force is 31 N), and it is only possible to tear off the connector from it with a force of 140 N. The contacts are made of a copper-nickel alloy - there should be no problems.

The tip is well thought out - normal seals and a comfortable “hat” on top do not promise any trouble. Wires can be hidden in corrugated screens - double protection against overheating is guaranteed. By the way, the material also does not support combustion.

The resistance measurement showed: under normal conditions - from 5.1 to 6.17 kOhm, after a “shower” - from 4.8 to 6.0 kOhm, and after the “sometimes in heat, then in cold” mode - from 4.9 up to 6.1 kOhm.

The price of the product is 500-550 rubles.

The overall impression is what you need.

No. 3. Silicone ignition wires JANMOR (England). There are no tips.

The British have good “mechanics” - the force of separation of the connector from the wire is 125 N. The lock of the connector is made in the form of an extrusion - approximately 47 N. will be required to remove the wire from the coil. "- from 2.24 to 4.3, and after a temperature difference - from 2.2 to 4.4.

The price of the product is about 180 rubles.

The general impression is normal wires without any complaints.

No. 4. Silicone wires for the Khors ignition system (St. Petersburg). Tips are not included, but a pity.

Experts say the noise level with these wires is low. But with the "mechanics" there was a problem - the connectors fall off the wires without much persuasion. Nevertheless checked everything else. The wire holds well on the coil - the disconnection force is 46.5 N. The resistances are as follows: under normal conditions - 3.2–4.27 kOhm, after moisture - 2.7–3.8 kOhm, after “temperature” - 2.7 –3.85 kΩ.

The price is about 220 rubles.

The general impression is that the cable is good, and the rest is “according to Chernomyrdin”.

No. 5. Set of wires "Citron" (Mikhailovsk, Stavropol Territory).

A petal lock is not the best solution today. Nevertheless, the wire on the reel holds rather tenaciously - the separation force is 30 N. The toothed shank clings to the wire tightly - the separation force reaches 160 N. But the wires of joyful emotions themselves, most likely, will not cause - these are usually used on production cars. Tips not included.

Wire resistances are the lowest of all, with an explicit calculation for the resistor at the tip. The numbers are as follows: from 433.4 to 831 Ohms before the test, from 434 to 831 Ohms after the “water procedures”, and from 433 to 830 Ohms after the “climate”.

The price of wires will surprise anyone - a little more than 30 rubles!

The general impression is that for such a price you can forgive everything.

No. 6. Set of silicone Caesar ignition wires (D and G company, Moscow).

According to the description, made from the cable of the English company Millflex. The force of separation of the connector from the wire 140 N corresponds to a triple margin of safety. But on the reel, “Caesar” is the worst kept - 24.5 N, although they fit into the norm, they are barely able to. It could have been worse: after all, the petal design of the lock and the absence of teeth on the shank is not very good. The resistance of the wires is from 3.3 to 5.4 kOhm under normal conditions, from 3.14 to 5.1 kOhm - after exposure to moisture, and from 3.2 to 5.1 kOhm - after the "climate". Tips, alas, are absent.

The cost is about 220–250 rubles.