A mechanically supercharged engine on a street bike makes the sound of a supercharged engine exhaust sound in the air. The unheard-of monster KAWASAKI ZH2 goes on sale in Japan in April this year (2020).

The beautiful extension of power is the source of the mechanical supercharged engine’s unique pleasure.
Let’s take a look at the measured power of the DYNOJET motor. The maximum power measured is 194 ps, which is less than the 200 ps recorded in the model catalog, but it may not be the same on a real ride. In any case, this is the most powerful of the current NK street bikes.

Of particular note is the power delivery. The throttle response of the mechanically supercharged engine has always been considered to be poor, but this problem has been solved with the Ninja H2 SX. Even in the sharpest horsepower mode, the horsepower becomes very straight and easy to control, and because the traction is so good, it also keeps the ride enjoyable. Conversely, the engine responds beautifully even when the idle speed drops slightly into the lowest speed range, with no troubling booster lag.

To improve performance at low and medium speeds, KAWASAKI has changed the design from the Ninja H2 by dropping two gears, which is very clever. The theoretical top speed is 291km/h, but in practice, it is already at its limit of 272km/h. However, when the speed and boost are increased, the NK street bike generates a hurricane-like wind in its travel, which increases the speed of the bike and thus makes it’s setting a reality.

At full throttle, the rider can easily go from zero to 200km/h in just 8 seconds while reveling in the sound of the supercharged engine’s exhaust.

Top speed: theoretically 291km/h in 6 gears!
The maximum speed of the Z H2 in different gears is shown below. 291km/h is theoretically possible with 6 speeds and full throttle, but in reality, the speed limit is reached when the speed exceeds 10,800rpm, which is the peak power, and 272km/h is reached before 12,000rpm. However, as the NK street car is affected by the wind generated during travel, this speed is in fact the actual value that can be achieved.

Horsepower and torque: increasing horsepower all the way
The actual results are 194ps and 134Nm (13.66kg-m), which is a little short of the 200ps and 14.0kg-m figures in the catalog. However, as the catalog states, “*Results vary depending on the operating environment”, it is not surprising that the intake pressure at the air inlet alone differs between the DYNOJET dynamometer test and the actual ride, so the final figures may vary.

In any case, the performance of the mechanically supercharged engine is uncompromising, with 100Nm of torque generated at 4,000rpm. Incidentally, the current HONDA FireBlade requires almost double the rpm of the Z H2 to achieve this level of torque, and the Z H2’s very even upward curve of power is a definite advantage in terms of handling, and therefore a key point of interest on this car.

As a side note… the presence or absence of a fairing on the Ninja H2 SX, which is also powered by a balanced, mechanically supercharged engine, can have a huge impact, and the H2 SX was able to overcome this disadvantage easily when pitted against the most powerful monster of all time, the NK street bike B-King, with a displacement of 1,340 c.c. against 998 c.c.

Acceleration performance: no less than the full fairing model
The results of the acceleration test are as follows. Incidentally, although not under the same conditions, the 0-100km/h test results of the 2018 Ninja H2 were 3’665 seconds, the 2015 Ninja H2R 3’630 seconds, the 2017 Ninja ZX-10RR 3’474 seconds, and the latest Z H2 may be an NK street bike, but its sprinting performance is no less than that of a full fairing.

KAWASAKI Z H2 acceleration

Braking performance: a conservative design for safety – the anti-lock braking system
The IMU-linked, electronically controlled ABS system – KIBS (Intelligent Anti-lock Braking System) – features precise control intervals. It prevents the rear wheel from floating and gives the tyres a firm grip on the ground, giving the rider a high degree of security. The braking distance from 100km/h is 44.3m, which for us at Motorrad is a highly interventionist and defensive design, and feels a little too long. In training courses it is usually recommended that the braking distance should be 84m at 100km/h, and this bike can stop much quicker. Also, the old Ninja 1000 had a braking distance of 42.4m, so the Z H2 should weigh a little more than that.

By admin