1.8 "R18Z4" Engine [e.g. Honda Civic]

The Honda 1.8 engine (engine code: R18Z4) is a four-cylinder inline engine developed as part of Honda’s R-series. It has a displacement of 1.8 litres and comes equipped with Honda’s i-VTEC system, which delivers improved fuel economy and greater power. The engine also uses Honda’s Eco Assist system, helping drivers save fuel.

This engine has been used in a number of Honda models. It first appeared in the Honda Civic in 2006 and remained in use until 2015. It was later also fitted to the Honda HR-V and Honda CR-V.

Peak output is 141 horsepower (105 kW) with 174 Nm of torque. The i-VTEC system allows precise control of valve opening and closing, which improves fuel economy and boosts power. The engine also features Honda’s ECO mode to help save fuel.

Compatible gearboxes include a 5-speed manual and a 5-speed automatic. The Honda 1.8 engine has also earned a strong reputation for reliability and durability.

In short, the Honda 1.8 engine (engine code: R18Z4) is a four-cylinder inline engine fitted with Honda’s i-VTEC and Eco Assist systems. It has been used across several Honda models, including the Civic, HR-V and CR-V. Peak output is 141 horsepower (105 kW) with 174 Nm of torque, and it pairs with a 5-speed manual or 5-speed automatic gearbox.

Here are the key facts on which vehicles the Honda 1.8 engine (engine code: R18Z4) was fitted to:

The Honda 1.8 engine was introduced in 2006 and remained in production until 2017.

It was fitted to various Honda models, including the Civic, CR-V, HR-V and Insight.

In the Honda Civic, it was used from the 2006 model year onward, including the Civic Si, Civic Type R and Civic Hybrid.

In the Honda CR-V, it was used from 2006 to 2011, and again from 2015 onward.

In the Honda HR-V, it was used from 2015 to 2018, and again from 2021 onward.

In the Honda Insight, it was used from 2010 to 2014, and again from 2019 onward.

The Honda 1.8 engine was also used in the Acura CSX and ILX, models produced by Honda’s luxury brand, Acura.

In summary, the Honda 1.8 engine was used across various Honda models and select Acura models during its production run from 2006 to 2017.

The exact engine shown in the photo may no longer be available, but we always send our offer together with photos and full details of the actual available engine, including mileage and overall condition.

Which cars does this engine fit?

Engine code R18Z4 was fitted to models including: Honda Civic. The list is indicative — the same engine may also have been used in other models from the same manufacturer.

Always check your own engine code before ordering. The same displacement and the same model name can mean a different engine in a different model year, and only the code tells you for certain which engine the car has.

Where do I find the engine code?

The engine code is usually in one of three places:

• The registration document — under engine type or engine number.
• The engine itself — cast or stamped into the block, often at the gearbox end or under the cover.
• A workshop — a garage reads the code from your VIN in the manufacturer’s catalogue in a couple of minutes.

If you cannot find the code, send us the VIN and the registration number with your enquiry and we will look it up for you.

Request a quote for this engine

Every engine we sell is tested and comes with a warranty. Most of our stock never appears on the website, so do ask for an engine that is not listed.

Send your enquiry with the engine code or the VIN and you will have an answer within 24 hours.