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The record will be great, but useful for many. We will only talk about classic spark plugs. Today there are many different types of candles: flare, plasma-chamber, and other candles without side electrodes. For each of them, you can create separate topics.
I can offer you to independently study the spark plugs , most of what will be written in this article can be found there. About candles once , about candles two , about three candles , about four candles .

What actually made me study the spark plugs? After the new year, while trying to intensively accelerate, the car began to twitch to 3000 rpm. Confidence was lost during overtaking, it will be true to say that each overtaking was a risk. He shoved everything onto the candles and began to study the "brochures" on the candles. Being sure that at the moment I have installed iridium candles, and they have passed more than 30 thousand km. I began to figure out what to stick now, again iridium or nickel. For some reason, I didn’t even think about platinum. To summarize the fictitious vote: the answers I received and the study of some forum threads:
1. For iridium — 15% of those who feel the difference between iridium and nickel, both in terms of vitality, consumption and dynamics. Also note the sensitivity of iridium to low-quality gasoline, a double-edged sword, like you can reject a gas station, but it’s also unpleasant to go; (price in the region of 450-500 rubles per piece)
2. Nickel — 55% of iridium is considered a waste of money. It is worth noting that of these 55%, only 1/3 indulged in both iridium and ordinary candles. There is no denying that iridium candles are tenacious of nickel, but there was no increase in dynamics and a decrease in consumption when installing them. The remaining 2/3 of the category "where everything is, there I am." (price in the region of 100-150 rubles per piece)
3. For platinum — 30% golden mean. They are not directly spoken about, that they seem to shove the 2nd engine under the hood, and modestly, platinum is very strong and reliable metal, both central and side electrodes can be made of platinum. The spark is more powerful than nickel, despite the low voltage, the flammability is stable, thanks to the thin central electrode. Throughout the entire service life, the clearance of these candles does not change. (price in the region of 250-300 rubles per piece)

First, consider the design of classic spark plugs.

We also divide the candles into two-electrode and multi-electrode. On multi-electrode candles, several side electrodes. This does not affect the effectiveness, it only affects the duration of working capacity. Therefore, multi-electrode candles are somewhat more expensive. In my opinion, the central electrode is more often destroyed, therefore it is advisable, when choosing a multi-electrode plug, that the central electrode be at least from platinum.

A short video about candles.

Of course, prices play a decisive role. People see no reason to splurge. The car rides on ordinary candles, it rides well, so what else is needed? I agree, but I will defend iridium. For the most part, people shoving these candles do not know, elementarily, of the state in which they have nozzles, explosive wires, coils, etc., which contributes to the dynamics, consumption and formation of soot on candles. So, getting by with little blood, you are unlikely to achieve the desired result.

If you paint by company, probably the most common companies (NGK, Denso, Champion, Bosch, Beru, Brisk) have fakes. And as I said about motor oil, you can fill in any company’s oil, the main thing is not fake. (Well, to be honest, I read the most negative about the spark) If your candles failed, soon after replacing them, you should not immediately spread the idea that these candles are g ** but. Perhaps you had a bad purchase, fake or marriage. Or you just picked up the candles incorrectly. Or they did not carefully examine the candles for mechanical damage, or for the set clearance. Or even worse, the joint is not lurking in the candlelight … And when replaced with other candles, the same thing will happen soon …

For myself, I have identified 2 firms, NGK and Denso. The candles of these 2 firms are installed on Subaru engines from the factory. Then he spread to Bosch, very flattering reviews about them, especially about platinum. But the decisive factor in the choice was the fact that at that time Denso was installed, 3 winters had been experienced without problems, it always started.

Having decided on a company, you can go to the online catalog of your car and find the necessary candles among the analogues, or just go to the store, and the consultants themselves will pick it up. I did so, but the japancats catalog offered me candles K20PR-U11, and in the store, in another catalog K16PR-U11. The difference in the number of heat.

I decided to figure out what my engine needs. And immediately lost his way to pantalik, because candles do not have a single standard for labeling, such as oils. Each company has its own marking. Plus, for engines of different sizes, with a different number of camshafts (SOHC or DOHC) and with / or without a catalyst — also different candles. But, walking along the steps, you can accurately choose the candles for your engine !

Open the manual.

Everything seems to be clear (2 camshafts — a 2-liter SOHC engine), but my cat is knocked out. Accordingly, the question arose, which candles should I put in this case? The difference in the candles is significant, different glowing number (5 versus 6 (16 and 20 in denso, respectively)) and the gap between the electrodes (1.1 mm versus 0.8 mm.). The absence of the last 2 numbers in the marking, as a rule, means that the clearance is 0.8 mm. I received an answer that the ECU most likely did not tune after getting rid of the catalyst, well, that’s logical, since the snag has been installed. Therefore, use those recommended with the catalyst. So you need candles with a glow number 5 (16) and with a gap of 1.1 mm.

Knowing the necessary candles from one manufacturer, you can choose candles from another manufacturer using the table of interchangeability of the main types of candles.

For interest, I decoded the labeling of the selected Denso candles — K16PR-U11 , in which each letter and number is a parameter:

* K — thread diameter 14mm .; thread length 19mm .; hexagon size 16.

16 is the incandescent number.

P — extended by 1.5mm. insulator.

R — means the presence of a resistor.

-U — U-shaped groove on the side electrode.

11 — the gap between the electrodes is 1.1 mm.

Having examined the parameters of the candles, we proceed to their installation.
There have already been many denials about the difficulty of replacing candles on a Subaru. Of course, on 4-shaft engines this is really not so simple, but at least removing the engine is certainly not required. On 2-shaft so everything is generally easier than ever. Let’s sort in order:

1. Disconnect the battery terminal.

2. Dismantle the inlet duct and inlet chamber. All this rests on the 1st bolt on 10 and 2 bolts on 12. Disconnect from the air filter housing and remove to the side. Thus, we freed the right side.

3. Dismantle the washer reservoir. We unscrew 2 bolts by 10, disconnect the chip (chips, if the car) and the hose. We put the tank in such a way that water does not flow out of it. The left side is free.

4. Disconnect the BB wire from the candles.

5. As far as possible, clean the wells before twisting the candles. Ideally, it is better to blow with air. To prevent dirt from entering the combustion chamber.

6. Unscrew the candles.

7. Having taken out the candles, we plug the wells with something to prevent the ingress of dirt.

8. Carefully inspect each candle for damage, deformation, etc. We examine the electrodes, analyze the carbon deposits. Nagar can say a lot.

Полный каталог подбора свечей зажигания и накаливания на Subaru Impreza.

Если вы не нашли свою машину в каталоге или не уверены с выбором, воспользуйтесь подбором по VIN.