What Engines Can You Put in Ford Focus RS?

An engine swap on is probably one of the most complicated modifications you can pull off for Ford Focus RS. You can go for the engine with the best compatibility and moderate performance boost or go all in and swap a gas engine for a diesel one. The only thing that can limit your expectations is your own safety. Focus RS engine interchange is no simple feat that requires a lot of additional work, fitment, modifications and expertise.

The options available for a specific vehicle may be limited by factors such as compatibility, emissions regulations, and the availability of parts and support. Ultimately, the chosen engine should be suited to the vehicle's intended use and installed or modified by a qualified mechanic or technician.

The type of engine that can be put in a Ford Focus RS depends on several factors. You can find all this information a comprehensive engine swap compatibility guide below.

Ford Focus RS Engine Swap Compatibility Chart

Ford / Inline-4 / EcoBoost - Petrol / 2.3L / 2.3L EcoBoost
Ford Bronco, 2021, 2022
Ford Explorer, 2016, 2017, 2018, 2019, 2020, 2021, 2022
Ford Focus RS, 2016, 2017, 2018
Ford Mustang, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022
Ford Ranger 2019, 2020, 2021, 2022, 2023

To find information about your car's engine or another engine of a particular vehicle, you can consult our Ford Focus RS engine interchange compatibility chart, which provides a comprehensive list of years and trim levels when the same engine was used. 

Additionally, we list other vehicles that have the same engine under the hood, making it easy to cross-reference and compare.

Are you uncertain about the engine in your vehicle? Our comprehensive guide can help identify its name and specs, allowing for educated decisions regarding maintenance or upgrades. With this knowledge, you will be able to take control of your car's future confidently.

What Kind of Engine Does my Focus RS Have?

Before you can find compatible engines in our swap chart, you need to learn what kind of engine your Focus RS has. Here you have a few options. Firstly, you can check the Vehicle Identification Number (VIN), which is often located in the owner's manual or under the hood. In many cases, it can also be found on the driver's side dashboard. The eighth character of the 17-digit VIN provides information about the engine, so by decoding it, you can determine the type of engine.

The VIN includes details about the country of manufacture, manufacturer, car type or division, brand, body style, engine size and type, model, assembly plant, and model year. If you want to decode the VIN, there are websites available that can do this for you. 

Just enter the 17 characters of your car's VIN into the website, and you'll receive a report with all the relevant information. This can be a quick and convenient way to learn about your car's history and specifications.

Alternatively, if you know the specific trim level of your Ford Focus RS, you can conduct an online search to identify the type of engine it has. This information can be helpful for maintenance or upgrades.

How Do I Know if an Engine Will Fit in my Focus RS?

When selecting the ideal engine for your Ford Focus RS, it is important to be cognizant of automotive engineering principles and confirm that any chosen motor is compatible with your automobile. This will help you evade problems such as reduced performance or destruction caused by installing an incompatible power source. 

Before making a selection, factor in characteristics like size, fuel type, and strength output.

Lastly but most importantly, remember to get expert advice from a qualified mechanic or auto parts supplier before going ahead with anything.

Axles and Drivetrain

Connecting the drivetrain and gears during an engine swap requires intricate precision. If the engine is not from a specialist, custom shafts need to be made to ensure compatibility with the existing front-or rear-wheel drive system. 

These connections rely on the accuracy and any errors could have a large detrimental effect on the whole project. Ensuring these connections are done correctly is paramount for a successful and safe Focus RS engine swap.

Pedal Assembly

Ensuring compatibility between the gas and clutch pedals is essential when swapping an engine for Ford Focus RS and its gearbox. For older engines with cable-operated throttle bodies, it may be as simple as a cable change. Electronic control systems require specific ECUs, pedal assemblies, and wiring to work correctly. Cable-operated mechanisms in cars with cable-operated gearboxes can usually be reused while swapping out the transmission. If a hydraulically controlled transmission is used, an adapter line connecting the clutch slave cylinder to the master cylinder may need to be made.

Installing hydraulically operated gearboxes in chassis featuring cable-driven transmissions can also be done with an adapter kit, the corresponding pedal assembly, and hydraulic components such as the clutch master cylinder and reservoir.


It is critical to evaluate the compatibility between the Focus RS’s transmission and shifter. Each transmission has a different shift pattern which dictates how gears are shifted into place. 

Therefore, you must take into account all of the separate elements that make up the shifting mechanism such as links and handles made specifically for one type of transmission or another. It’s important to ensure these components match in order to guarantee smooth gear shifts.

This might necessitate changing either the shift pattern or shifting mechanisms altogether and swapping out for a different assembly made for your refreshed transmission. After this step is complete, confirm that all of your linkages are correctly adjusted in accordance with how they were intended to be aligned before test driving.

Fuel System

To interchange with a more potent engine, it is essential that you have higher caliber fuel lines and superior filtration. Driving with a faulty fuel pump can easily ruin your whole day. To avoid such complications, it is always recommended to use a factory-style in-tank pump while driving daily. 

Frame-mounted high-volume pumps are designed for more extreme conditions and should not be used for general driving as they often vibrate, run hot, and may cause failure or cabin noise if used over long periods of time.

Cooling System

As you replace the Focus RS’s engine, it's critical to evaluate its cooling system compatibility. Mechanical fans may still be functional for older engines, however, modern ones generate much more heat and require an even better flow of air. Before installation starts, take into account all relevant details about the engine and choose a reliable electric fan - this will make sure that your car runs efficiently.

A/C and Power Steering

To simplify the installation process, modern motors’s designs often include designated areas for air conditioning compressors. However, these locations can be found in a lower portion of the engine which may make it complicated to mount properly between frame rails. To resolve this issue you may need to move your compressor elsewhere in order to get secure placement. It is also common for people to struggle with setting up their systems correctly and deciding where each component such as an accumulator/dryer or fixed orifice should go when building out their system.

Intake and Exhaust

The shape and size of intake piping needs to be adapted to fit the new engine on Ford Focus RS, while an adapter pipe may be needed for the exhaust manifold to match the existing exhaust system. Doing so will ensure that the engine runs optimally and safely, providing drivers with the best possible performance.


Focus RS enthusiasts often encounter wiring problems when working on engine interchange projects, regardless of the project's size, particularly in modern engine swaps. Wiring can be complicated and demands knowledge about circuits, amperage, wire gauges, and relays. For instance, the electric fan circuit is more complex than just running two wires for power and ground. It also requires integration with the cooling system and air conditioning system, as well as one or two relays to function properly.

Clearance Problems

Clearance issues are a common challenge in Ford Focus RS engine swap projects, as the new engine may not fit the same way as the original one. This can be especially true when getting a larger engine, or an motor from a different vehicle. In some cases, modifications to the engine bay, subframe, or firewall may be required to ensure proper fitment. 

Suspension and Brakes

An engine swap can present a variety of suspension and brake challenges, most notably when upgrading Focus RS to a more powerful engine. The extra power and weight can significantly impact the handling and braking performance. To compensate for this, it is important to upgrade the suspension and brakes accordingly.

This may involve changing out shock absorbers, springs or installing a larger sway bar, as well as ensuring that the Focus RS’s brake system is adequate for the increased power by fitting a larger master cylinder or booster. 

How Would Ford Focus RS Benefit from Engine Change

Obviously, swapping out an engine can be a great way to make your Focus RS move again! It is also able to provide more horsepower, improved fuel economy, smoother acceleration, better handling, and lower emissions than the original motor.

Although, it rarely combines multiple benefits. Larger and hungrier engines are quite unlikely to show lowered fuel consumption while diesel engines can have serious emissions.

How Long Does It Take to Swap an Engine on Focus RS?

Interchanging compatible engines is a complex job that can take between 8 to 15 hours, depending on the integration difficulty. Those with mechanical expertise may be able to reduce this timeframe -- simple gas or diesel engines can be substituted in only 5-6 hours if you have the right devices and understanding.

How Hard Is It to Swap Ford Focus RS Engine?

Replacing the Focus RS’s motor is no small task. It requires careful and meticulous steps in the correct order, as well as specialized tools, parts, and equipment. In some cases, having an assistant may also be necessary for certain tasks. It can be a lengthy process with many steps, but it is often well worth the effort if done properly.

The difficulty depends on how closely two compatible engines you are swapping resemble each other. Size, type and other crucial specifications influence the challenge.

How Much Does Focus RS Engine Interchange Cost?

When weighing the expenses of buying a used car instead of your Ford Focus RS or replacing an engine, consider that although expensive, an engine swap is often more cost-effective. 

On average, the labor cost for the Focus RS engine replacement will range from $1500 to $4000. The motor’s price tag may also vary significantly though you should be ready to pay a anywhere between $2000 and $4000 thousand dollars for a used engine. 

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