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DISI Turbo | Direct Injection Spark Ignition Technology | Variable Valve Timing Technology

DISI Turbo

DISI Turbo includes a whole new set of innovations for gasoline engines. To mention a few, direct injection (including cooling the air-gasoline mixture), a new combustion chamber geometry, variable timing technology, and nanotechnology for the catalyst. This all makes the engines consume 20 percent less while getting 15 to 20 percent better performance.

What exactly does DISI Turbo indicate?

Direct Injection, Spark Ignition

Mazda has unveiled a new series of direct-injection gasoline engines, following Ford’s introduction of the Ecoboost engine family. DISI Turbo stands for Direct Injection Spark Ignition, and it is the acronym Mazda chose for this technology.

What are the three different types of fuel injection systems available?

Throttle body injection, multiport injection, and direct injection are the three main methods of fuel injection.

What does it mean to have direct fuel injection?

An injector supplying gasoline directly into the cylinder of an internal combustion engine is known as direct fuel injection. Lower pollutants, lower cylinder head temperature, greater power, and better fuel efficiency are all benefits of delivering gasoline directly into the cylinder.

Direct Fuel Injection Technology has a long and illustrious history.

An injector supplying gasoline directly into the cylinder of an internal combustion engine is known as direct fuel injection. DISI Turbo is a relatively new idea, initially appearing in diesel engines in the mid-1990s but just lately becoming widely used in gasoline engines.

Port-fuel injection, which put the fuel injectors in the intake ports and sprayed fuel over the rear of the valves before flowing into the cylinder, was the traditional fuel delivery technique. Since the introduction of fuel injection, which replaced carburetors, this has been the standard.

Why would a company switch from port injection to direct injection?

Direct injection Spark ignition (DISI turbo) provides additional control over the fuel delivery process by atomizing the gasoline spray in the cylinder, improving fuel distribution throughout the combustion chamber, and allowing sophisticated engine management procedures like Variable Valve Timing to be used.

Is it better to inject directly or through a port?

At lower engine speeds, port injection delivers a better, more stable air/fuel combination, resulting in smoother starting functioning. Direct injection offers a better cooling effect at higher RPMs, allowing for more power and a lower likelihood of knock.


Is it true that direct injection engines are noisy?

The engine bay might hear a fast clicking and ticking sound produced by a direct injection fuel system. When outside the car or when the bonnet is open, the sound seems to be more audible. The sound is more audible at idle and occurs more often at a cold start, but it fades as the engine warms up.

Mazda DISI Turbo Technology


Further developments for its diesel: new direct injection technology (most European automakers are switching to piezoelectric injectors), making the engine lighter, DPF, and urea technology to reduce NOx emissions


Mazda’s DISI* engines balance sporty driving with outstanding environmental performance. With the next generation engine in the series, we are aiming for a 15% ~ 20% improvement in dynamic performance and a 20% increase in fuel economy (compared with a Mazda 2.0L gasoline engine).

Based on the direct injection system, we aim to reduce all energy losses (see figure on the right) and improve thermal efficiency through innovative engineering in a variety of technological areas. Among these technologies, we are paying particular attention to direct injection, combustion control, variable valve system technology, and catalyst technology. Also, among the various fuels on the market, we are studying the use of flex-fuel.

What are the symptoms of a malfunctioning fuel injector?

Below are some indications that your fuel injectors may be malfunctioning.

  • Misfires occur in the engine. Fuel injectors that are dirty might cause your vehicle’s engine to misfire.
  • Idling Can Be Harsh.
  • Mileage decreases
  • The RPM Needle Begins to Move.
  • Your vehicle will not start.

Is it true that direct injection engines use more oil?

DISI Turbo engines wouldn’t burn anything more oil than other engines while they’re clean. When carbon deposit begins to accumulate on the intake valves, issues arise. Fuel wash from the gasoline mist in the induction system definitely keeps the valves clean in carbureted and port fuel-injection engines. This does not happen in DISI Turbo engines since the gasoline is sprayed straight into the cylinder.

Carbon deposits on valves cause more performance loss than oil-burning difficulties by themselves. However, if those deposits peel or flake off, they might become stuck in the piston ring region, increasing oil consumption.

What is the best way to remove carbon buildup?

Remove any residual carbon with solvent and smooth rough areas with fine steel wool. To remove stubborn deposits, immerse metal components in oil for up to 15 minutes. If required, scrape again to dislodge tenacious grit. Then, using the solvent, thoroughly clean the area and place the head away.

Is direct injection standard on all new cars?

According to the Environmental protection agency 2019 Automotive Trends Survey, direct-injection engines were found in 51% of the US sector. Although the percentage has grown as high as 100% for Mercedes-Benz and as low as 2% (by volume) for Toyota, EPA projections show that by 2025, 98 percent of gasoline engines in new automobiles will feature direct injection (DISI Turbo).

The DISI Turbo’s disadvantages

The main difficulty with a direct injection is the aggregate quantity of carbon in the intake ports and on the rear of the valves.

The previous technique of fuel delivery was injection at the port where fuel was injected and then transferred into the cylinders at the intake ports. The fuel system generation did not accumulate as much carbon because gasoline detergents helped to clean such ports and valves.

A further difficulty is the lack of lower combustion temperatures in finely atomized fuel, which results in a major loss in efficiency and performance until the engine achieves the optimal operating temperature.

The final issue is the extra complexity of a production engine that these technologies entail. Direct injection requires a further high-pressure fuel pump, together with bigger heavier injectors. Another possible failure point in the fuel system is the additional fuel pump. The hefty injectors might also be a little costlier than ordinary ones to replace.

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