Katerina Swanson
Honda Civic owners often modify their cars by swapping fuel rails and injectors. Some Honda Civic Forum users have discussed swapping a D16Y7 fuel rail and injectors with a D16Z6 head. While some users have confirmed that the injectors flow at the same rate, others have suggested that the D16Y7 injectors are smaller and that the D16Z6 injectors will not run correctly on the Y7 ECU.
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What You'll Learn
D16Y7 vs D16Y8 injector flow rates
The D16Y7 and D16Y8 fuel injectors have the same flow rate of 240cc saturated. Unless one is ODB1 and the other is OBD2, in which case they have different connectors, the injectors should function the same on either engine. They share the same part number, so it would be difficult to tell them apart without prior knowledge.
However, some sources suggest that the flow rates differ between the two injectors. One source states that the Y7 injector flows at 180cc, while the Y8 injector flows at 240cc. This claim is refuted by another source, who states that all D-series engine injectors flow at 240cc, which is a common flow rate for Honda vehicles.
In terms of compatibility, the D16Y7 and D16Y8 fuel injectors can be swapped between the two engines. The throttle body of a D16Y7 can be used on a D16Y8 intake manifold, and vice versa, without any issues.
Regarding the fuel rail, the D16Z6 fuel rail can be used with the D16Y7 and D16Y8 injectors, but some modifications may be required. The distance between the injectors on the D16Z6 fuel rail is the same as on the D16Y7 and D16Y8, but the size of the injectors themselves may need to be customized to fit properly. It is recommended to use an aftermarket fuel rail specifically made for the D16 engine and bore it out to fit the desired injectors, as the stock D16 injectors are smaller than the D17 injectors.
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D16Y7 throttle body on a D16Y8 intake manifold
The D16Y7 throttle body can be used on a D16Y8 intake manifold, but it is designed for a different style of manifold. The Y7 is downdraft, while the Y8 and other D-series are sidedraft. The throttle cable hooks up in the wrong place, and the sensors may not be in the right places either.
There is a significant amount of work required to make the D16Y7 throttle body compatible with the D16Y8 intake manifold. It is thought to be a gain of about 15-20 horsepower due to the better design of the Y8 manifold.
The Y7 and Y8 injectors flow at the same rate of 240cc saturated, and they have the same part number. However, some sources suggest that the Y7 injectors flow at 180cc, which is lower than the Y8 injectors.
It is important to note that the D16Y7 does not have a carburetor, and most Hondas are fuel-injected, not carbureted.
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D16Y7 injectors on a D16Z6 manifold
Swapping a D16Z6 intake to a D16Y7 engine is possible, but there are a few differences to note. The IAT is on the intake manifold, so you might need to extend the wire and change the plug. The D16Y7 throttle body should work with the Z6 manifold, but you'll need to block off the Iacv. The Z6 manifold's PCV can be removed as it's on the Y engine's black box.
It is recommended to use the Z6 fuel rail, but with the Y7 injectors as they are smaller, and bigger Z6 injectors will not run correctly on the Y7 ECU. All MPFI D-series engines use the same size injector, but there are differences between high and low impedance and the connectors between OBD0 and OBD1.
D16Y7 injectors are 190cc, while all other injectors, including the D16Z6, are 240cc. This means that the D16Y7 injectors are smaller and will fit inside the D16Z6 manifold, but the D16Z6 injectors will not fit inside the D16Y7 manifold without modifications.
One option is to use an aftermarket fuel rail specifically made for the D16 and modify it to fit the injectors of your choice. This can be done by boring out the injector holes in the rail as the D16 stock injectors are smaller than the D16Y7 injectors. Another option is to weld a bung into the stock rail.
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D16Z6 fuel rail and injectors
The D16Z6 is a fuel rail and injector set-up for the Honda D-Series engine. It is a popular choice for car enthusiasts and is often discussed on online forums. The D16Z6 fuel rail is known to be compatible with a range of Honda engines, including the D15B7, D15B8, and D16A6. It is made from aluminium alloy and is designed for high-volume fuel injection.
When it comes to the injectors, the D16Z6 stock injectors are smaller than the D17 injectors. Some car enthusiasts choose to customise their D16Z6 fuel rail to fit larger injectors. This can involve boring out the injector holes in the rail or using a spacer. However, others opt to use the stock injectors with the D16Z6 fuel rail, as they are designed to fit without any modifications.
It is worth noting that some people have experienced issues when installing an aftermarket D16Z6 fuel rail. For example, one person reported a fuel leak caused by bolt holes for the regulator being drilled through into the fuel channel. This issue was resolved with Teflon tape. Additionally, when swapping fuel rails, it is important to consider the injector plate, as the mounting holes may not fit without modifications.
Overall, the D16Z6 fuel rail and injectors are a popular choice for Honda D-Series engines, offering a range of customisation options for car enthusiasts. While some modifications may be required for those seeking to use larger injectors, the stock injectors are designed to fit without any issues.
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D16Z6 stock injectors
The D16Z6 is a Honda engine that is known for its reliability and performance. The stock fuel injectors on the D16Z6 engine are an important component of the fuel delivery system, and understanding their specifications is crucial for maintaining optimal engine performance.
The stock injectors on the D16Z6 engine have a flow rate of 240cc, which is a standard specification for Honda vehicles. This flow rate ensures the injectors deliver the precise amount of fuel required by the engine, maintaining a balance between performance and fuel efficiency. However, some sources suggest that the D16Y7 injectors flow at 180cc, while the D16Y8 injectors are said to flow at 240cc. It is recommended to verify the compatibility of injectors before installation, as OBD1 and OBD2 injectors have different connectors.
Over time, stock injectors may experience issues such as leaks or clogging, leading to reduced performance or fuel leakage onto the intake manifold. In such cases, cleaning or replacement may be necessary. Replacement injectors can be sourced from specialist cleaners or online platforms like eBay, with prices ranging from $12 to $20, or even $39 for higher-performance injectors.
When considering modifications or upgrades to the fuel injectors, it is important to seek expert advice. While larger injectors can provide a noticeable gain in horsepower, they may also impact fuel efficiency. Additionally, ensuring the compatibility of the fuel rail, injector plate, and manifold is crucial for a successful upgrade.
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Frequently asked questions
The D16Y7 injectors are smaller than the D16Z6 injectors, so they will fit, but the D16Z6 injectors will not fit the D16Y7 engine.
The fuel rail should fit, but you may need to weld mounting points.
The D16Y7 injectors flow at 180-190cc, while the D16Z6 injectors flow at 240cc. The D16Y7 injectors should work, but the computer may need to compensate for fuel flow.
