Suzuki H25A, H25Y engines
The Japanese are one of the best automakers in the world, which is not subject to even the slightest dispute.
There are more than ten largest auto concerns in Japan, among which there are both "medium-sized" manufacturers of machine products and clear leaders in their field.
Suzuki can be fully ranked among the latter. For many years of activity, the concern has launched a million tons of reliable and functional units off the conveyors.
Suzuki engines deserve special attention, which we will talk about today. To be more precise, we will talk about the company's two power plants - H25A and H25Y. See the history of creation, the concept of engines and other useful information about them below.
Creation and concept of motors
The period between the 80s of the last century and the 00s of this century was truly a turning point in the entire automotive industry. With technological progress, the approach to designing and creating machine products has changed rapidly, to which large auto concerns simply could not help but respond.
The need for global change has not bypassed Suzuki. It was the innovative progress in the automotive industry that prompted the manufacturer to create the internal combustion engines considered today. But first things first…
In the late 80s, the first really popular crossovers appeared. Mostly, they were produced by the Americans, but Japanese concerns did not stand aside either. Suzuki was one of the first to respond to the trend and high popularity of compact SUVs. As a result, in 1988, the well-known Vitara crossover (the name in Europe and the USA is Escudo) entered the manufacturer's conveyors. The popularity of the model became so huge that already in the first years of its release, Suzuki began to modernize it. Naturally, the changes also affected the technical part of the crossovers.
Motors of the "H" series appeared in 1994 as a replacement for the main internal combustion engine used at that time in the Vitara design. The concept of these units turned out to be so successful that they were used in the creation of a crossover until 2015.
Representatives of the “H” series failed to become the main engines for the Vitara, but they can be found in many cars in the lineup. The H25A and H25Y considered today appeared in 1996, adding to the engine range from their 2- and 2,7-liter counterparts. Despite the innovativeness and novelty of these units, they turned out to be very reliable and functional. No wonder the base of reviews about the H25's is positive.
H25A and H25Y are typical 6-cylinder V-engines. The salient features of their concept are:
- The gas distribution system "DOHC", based on the use of two camshafts and 4 valves per cylinder.
- Aluminum production technology, which practically excludes cast iron and steel alloys in the design of motors.
- Liquid, pretty high-quality cooling.
In other aspects of building, the H25A and H25Y are typical V6-aspirated. They work on an ordinary injector with multi-point fuel injection into the cylinders. H25s were produced exclusively in atmospheric variations. It will not be possible to find their turbocharged or simply more powerful samples. They were equipped only with crossovers of the Vitara lineup.
Neither within the Suzuki car lines, nor with other manufacturers, the units in question were no longer used. Production of the H25A and H25Y is dated 1996-2005. Now it is easy to find them both in the form of a contract soldier and already installed in a car.
Important! There are no differences between H25A and H25Y. Motors with the letter "Y" were made in the USA, those with the letter "A" have a Japanese assembly. Structurally and technically, the units are identical.
Specifications H25A and H25Y
| Manufacturer | Suzuki |
|---|---|
| Motor brand | H25A and H25Y |
| Years of production | 1996-2005 |
| Cylinder head | aluminum |
| Food | distributed, multipoint injection (injector) |
| Construction scheme | V-shaped |
| No. of cylinders (valves per cylinder) | 6 (4) |
| The piston stroke, mm | 75 |
| Cylinder diameter, mm | 84 |
| Compression ratio, bar | 10 |
| Engine displacement, cubic meters cm | 2493 |
| Power, HP | 144-165 |
| Torque, Nm | 204-219 |
| Fuel | gasoline (AI-92 or AI-95) |
| Environmental standards | EURO 3 |
| Fuel consumption per 100 km of track | |
| - in the city | 13.8 |
| - along the track | 9.7 |
| - in mixed driving mode | 12.1 |
| Oil consumption, grams per 1000 km | to 800 |
| Type of lubricant used | 5W-40 or 10W-40 |
| Oil change frequency, km | 9-000 |
| Engine resource, km | 500 000 |
| Modernization options | available, potential - 230 hp |
| Serial number location | the rear of the engine block on the left, not far from its connection with the gearbox |
| Equipped models | Suzuki Vitara (alternate name - Suzuki Escudo) |
| Suzuki Grand Vitara |
Note! Motors "H25A" and "H25Y" were produced only in the atmospheric version with the parameters presented above, which was noted earlier. It is pointless to look for other variations of the units.
Repair and service
Both the Japanese H25A and the American H25Y are quite reliable and functional motors. During their existence, they have managed to form a considerable army of fans around themselves, supported by an excellent revocable base. By the way, most of the responses about the motors are written in a positive way. Among the typical problems with H25s, one can only highlight:
- third-party sounds from the gas distribution mechanism;
- oil leakage.
Such "malfunctions" appear with a high mileage of 150-200 thousand kilometers. Problems with the engine are being solved by its overhaul, which is carried out by any high-quality service stations. There are no difficulties in the design of the H25A and H25Y, so you should not be afraid of problems with its maintenance. The cost of all work will also be small.
An unpleasant feature for owners of H25s is the small resource of their timing chains. On most Japanese, it “walks” up to 200 kilometers, while those considered today have only 000-80 thousand. This is due to the specificity of the oil system of the units, which has channels of small cross section. It will not work to fix a small chain resource on H100A and H25Y. With this feature of the motors, you just have to put up with it. Otherwise, they are extremely reliable and do not cause problems during active operation.
Tuning
Upgrading the H25A and H25Y is done by a few Suzuki fans. This is due not to the suitability of these units for tuning, but to their good resource. Few motorists want to lose the latter for the sake of several tens of horsepower from above the drain. 
If the reliability parameter is neglected, then with respect to the H25s, we can:
- carry out the installation of the corresponding turbine;
- upgrade the power system, making it more "fast";
- strengthen the CPG and timing of the motor.
In addition to structural changes, chip tuning should be carried out. An integrated approach to improving the H25A and H25Y will allow you to “squeeze” 225-230 horsepower out of stock, which is very good.
Many owners of the units in question are interested in the question of power loss during their tuning. As practice shows, it is 10-30 percent. Whether it is worth reducing the level of reliability of internal combustion engines due to their greater promotion - decide for yourself. There is food for thought.
