How does a fuel injector work in a rotary engine?

Oct 10, 2025

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Ava Martinez
Ava Martinez
Ava is a logistics coordinator at Guangzhou Chaotian. She ensures the smooth transportation of construction machinery parts to global customers, making sure products are delivered on time.

Hey there! As a fuel injector supplier, I've seen firsthand how crucial these little components are in making engines run smoothly. Today, I'm gonna dive into how a fuel injector works in a rotary engine.

First off, let's talk a bit about rotary engines. Unlike the more common piston engines, rotary engines use a triangular rotor that spins inside an oval - shaped chamber. This design offers some unique advantages like high power - to - weight ratio and smooth operation. But just like any engine, it needs fuel to run, and that's where the fuel injector comes in.

The Basics of a Fuel Injector

A fuel injector is like the engine's waiter. It's responsible for delivering the right amount of fuel at the right time to the combustion chamber. In a rotary engine, this is super important because the combustion process is different from a piston engine.

Most fuel injectors are solenoid - operated valves. When an electrical signal is sent to the injector, a solenoid inside it gets energized. This causes a valve to open, allowing fuel to flow through. The amount of fuel that comes out depends on how long the valve stays open, which is controlled by the engine control unit (ECU).

How It Works in a Rotary Engine

In a rotary engine, the fuel injector has to work in harmony with the unique combustion cycle. The rotor moves in a way that creates three different phases in each chamber: intake, compression, and combustion.

Intake Phase

During the intake phase, the rotor moves in such a way that it creates a low - pressure area in the chamber. The ECU sends a signal to the fuel injector, and it sprays a fine mist of fuel into the intake port. This mist mixes with the incoming air. The fine mist is important because it allows for better mixing with the air, which leads to more efficient combustion later on.

Compression Phase

As the rotor continues to spin, the mixture of air and fuel is compressed. The fuel injector is idle during this phase. It waits for the right moment to deliver more fuel if needed. The compression in a rotary engine is different from a piston engine because of the shape of the chamber and the movement of the rotor.

Combustion Phase

When the compressed air - fuel mixture reaches the right point, a spark plug ignites it. The resulting explosion pushes the rotor, creating power. The fuel injector might also be used during this phase in some rotary engines to provide additional fuel for a more powerful combustion, depending on the engine's design and the load it's under.

The Role of the ECU

The engine control unit is like the brain of the operation. It constantly monitors a bunch of sensors in the engine, such as the oxygen sensor, throttle position sensor, and engine temperature sensor. Based on the data from these sensors, the ECU calculates how much fuel the engine needs at any given moment.

For example, if you're accelerating hard, the throttle position sensor tells the ECU that you need more power. The ECU then sends a signal to the fuel injector to open for a longer time, allowing more fuel to be sprayed into the engine. On the other hand, if you're cruising at a steady speed, the ECU will adjust the fuel delivery accordingly to save fuel.

Our Fuel Injector Products

At our company, we offer a wide range of fuel injectors suitable for different rotary engines and other types of engines as well. Here are some of our top - selling products:

Why Choose Our Fuel Injectors

Our fuel injectors are made with high - quality materials. We use advanced manufacturing techniques to ensure that each injector meets strict quality standards. This means you get a product that's durable and performs well over a long period.

We also offer great customer support. If you have any questions about our fuel injectors, like which one is right for your engine or how to install it, our team is always ready to help.

Contact Us for Purchasing

If you're in the market for a fuel injector for your rotary engine or any other engine, we'd love to hear from you. Whether you're a mechanic, a vehicle owner, or someone in the heavy - equipment industry, we've got the right fuel injector for you. Reach out to us to start a conversation about your needs. We can provide you with detailed product information, pricing, and shipping details.

Diesel Fuel Injector 6745-12-3100 For 6D114 EnginePC200-8 PC220-8 Fuel Injector 6754-11-3011 For 6D107 Engine

References

  • Heywood, J. B. (1988). Internal Combustion Engine Fundamentals. McGraw - Hill.
  • Taylor, C. F. (1985). The Internal Combustion Engine in Theory and Practice. MIT Press.
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