Regan Brown
The fuel injectors in a 1990 Integra are a popular topic of discussion among car enthusiasts. The size of the fuel injectors in a car is important because it directly impacts the amount of fuel that goes into the combustion chamber. Modern vehicles, including the 1990 Integra, deliver fuel through a fuel injection system. While there is some variation in opinion, it is generally agreed that the 1990 Integra has 240 cc/min injectors. However, some sources suggest that the injectors could be 244 cc or 310 cc.
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What You'll Learn
Stock 1990 Integra fuel injectors are 240cc
Stock fuel injectors for the 1990 Acura Integra are 240cc. This is true of all B-series Integras, including the Type-R. The flow rate of these injectors is often expressed as cc/min, or cubic centimetres per minute.
The 1990 Integra RS, LS, and GS models all feature 240cc injectors. The same is true of the 1992-2000 Integra LS and GS models. The 1992-1995 Acura Integra and 1996-2001 Acura Integra, meanwhile, feature 310cc injectors.
It's worth noting that the size or flow rating of a fuel injector is directly related to the amount of fuel that is introduced into the combustion chamber. The amount of fuel delivered to the engine is also determined by fuel pressure (at the injector/rail) and the pulse width/duty cycle of the injector.
While the stock 1990 Integra fuel injectors are 240cc, it is possible to purchase and install larger injectors. For example, RC Engineering offers 310cc high-resistance saturated fuel injectors that will fit every model, engine, type, or style of the 1992-2001 Acura Integra.
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The flow rate of fuel injectors is measured in cc/min
The flow rate of fuel injectors is measured in either pounds per hour (lb/hr) or cubic centimeters per minute (cc/min). The cc/min measurement is used to determine the amount of fuel that can flow through the injector per minute. This is dependent on the size of the injector, the fuel pressure, and the pulse width or duty cycle of the injector.
For example, a fuel injector with a flow rate of 240 cc/min can deliver 240 cubic centimeters of fuel per minute. This flow rate is commonly found in stock Integras, including the Type-R, as well as Civics and Preludes.
It is important to note that changing the fuel pressure can also affect the flow rate of the injectors. For instance, an injector flowing at 330 cc/min @ 40 psi will have a higher flow rate of 369 cc/min @ 50 psi.
The 1990 Integra, specifically, is reported to have a factory flow rating of 240cc. This is in line with other sources that state that most Integras have 240 cc/min injectors.
While the flow rate is measured in cc/min, it is also possible to convert this value to lb/hr using online conversion tools and formulas.
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Fuel pressure is the pressure of the fuel at the injector
Fuel injectors are an essential component of modern vehicles' fuel delivery systems. The fuel injector size, fuel pressure, and pulse width/duty cycle are the main factors that determine the amount of fuel delivered to the engine. This article will focus on fuel pressure and its role in the fuel delivery system.
Fuel pressure refers to the pressure of the fuel at the injector, which plays a crucial role in injector flow rate. The injector flow rate is the quantity of fuel that can flow through the injector at a given fuel pressure and duty cycle at mean sea level. It is typically measured in pounds per hour or cc/min. By adjusting the fuel pressure, users can control the amount of fuel delivered to the engine.
In a returnless fuel system, there is no return line to the fuel tank, and a pressure regulator attached to the fuel rail is not required. The PCM (Powertrain Control Module) selects and sets the fuel system operating pressure, controlling the pump's on-time to maintain the desired pressure. On the other hand, a return-style system will bleed excess fuel back to the tank through the regulator. This system can maintain a constant effective fuel pressure, which is advantageous for the function of fuel injectors, especially at lower fuel demands.
The base pressure in a return-style system is set with the engine off but the pump running. For example, in a GM system, the standard pressure in the rail is 58 psi. When the engine is idling and pulling a vacuum, the regulator adjusts the pressure in the rail to maintain a constant effective pressure. This helps prevent a loss of effective pressure during wide-open throttle and ensures that injectors do not have to run extremely low pulse widths to fuel at idle.
Understanding fuel pressure and its impact on injector flow rate is crucial for properly setting up the fuel system and achieving predictable fuel delivery. By adjusting fuel pressure, users can fine-tune their vehicles' performance and ensure optimal fuel delivery to the engine.
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Pulse width is how long the injector stays open
The size of a fuel injector is important as it determines the amount of fuel that goes into the combustion chamber. Modern vehicles use fuel injectors to deliver fuel through a fuel injection system. The amount of fuel delivered is based on three main factors: injector size, fuel pressure, and pulse width/duty cycle of the injector.
Pulse width refers to how long the injector stays open to deliver fuel. The longer the pulse width, the longer the injector stays open, and the more fuel is delivered in a given amount of time. This is directly controlled by the ECU (Engine Control Unit) and is the only factor of the three that is within the control of the ECU.
The ECU uses information from oxygen sensors that monitor the amount of oxygen in the exhaust to adjust the air-to-fuel ratio in real time. This closed-loop control system ensures very careful control of the air-to-fuel ratio, which is necessary for the catalytic converter to be effective. The ECU also increases the fuel rate in anticipation of more air entering the engine when the throttle valve opens.
The 1990 Integra RS/LS/GS has 240cc injectors, and most stock Integras, including the Type-R, have 240cc/min injectors. These injectors work at certain pressures, and increasing the pressure will increase the flow, while decreasing the pressure will reduce the flow.
It is important to note that changing any of the three main factors (injector size, fuel pressure, or pulse width) will result in a change in the amount of fuel delivered to the engine.
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The spray pattern and location in the manifold are also factors
The spray pattern and location in the manifold are critical factors in fuel injection systems. The spray pattern refers to the way in which the fuel is dispersed from the injector, and the location pertains to the placement of the injector in relation to the manifold and airflow stream.
The spray pattern can impact the fuel film and atomization, which is the process of breaking down the fuel into fine droplets to mix with the air. If the spray pattern is modified or disrupted, it can affect the engine's performance, as seen in the example of an F1 engine where a change in spray pattern resulted in the engine being unable to rev above 4000 RPM. Therefore, when changing or installing injectors, it is important to consider the spray pattern and make adjustments if needed.
The location of the injector in the manifold can be either upstream or downstream. Downstream injector placement, closer to the valve, is often preferred as it simplifies the system and makes mounting the fuel rails easier. Additionally, small-capacity nozzles with good atomization are typically placed downstream to ensure efficient fuel usage. On the other hand, mild stock engines with high-idle vacuum can handle upstream injector placement without significant performance loss.
The angle of the injector in relation to the airflow stream, known as the "intercept angle," is another important consideration. Maintaining an intercept angle of less than 45 degrees generally improves low-speed driveability and may enhance performance. The ideal intercept angle also depends on the inlet airspeed at idle, with lower airspeeds requiring a more precise angle to maintain drivability.
While spray pattern and location are crucial, they do not affect fuel delivery as significantly as the primary factors: injector size, fuel pressure, and pulse width/duty cycle. However, changes in spray pattern and location can impact fuel atomization and engine performance, so they should be carefully considered and tested when modifying or maintaining a fuel injection system.
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Frequently asked questions
The 1990 Integra has 240cc injectors.
The flow rate is 240 cc/min.
The 1988-'91 Civic Si/CRX Si, 1992-'95 Civic, 1996-'00 Civic dx cx and lx, 1990-'93 Geo Storm GSi, and the 1990-'93 Isuzu Impulse all have 240cc injectors.
