Volvo 2.5L Inline-5 B5254T3 Engine (Design, Specs & Reliability)

Last Updated on: 7th September 2023, 12:46 am

The 2.5L Inline-5 engine by Volvo was manufactured in an array of versions and models from 1991 to 2016. This engine guide will focus on the B5254T3 variant.

This engine found its way into a variety of vehicles, including several Volvo models and some Ford models such as the Focus, Mondeo, Kuga, and S-Max.

The B5254T3 is the well-known engine present in the Mk2 Ford Focus ST225 and RS. It is a straight-5 engine, part of the Volvo Modular engine family.

Engine Specifications

Here are the specifications for the B5254T3 variant of the inline-5 Volvo Modular engines.

• Production: 2005-2012
• Displacement: 2,522 cc
• Layout: Straight-five cylinder
• Compression Ratio: 9.0:1
• Bore: 83 mm
• Stroke: 93.2 mm
• Valvetrain: DOHC
• Power Output: 217 hp (220 PS) – 345 hp (350 PS)

Overview of the B5254T3 Engine

The B5254T3 engine by Volvo is a 2.5-liter straight-five engine featuring an 83mm bore and a 93.2mm stroke.

With a 9.0:1 compression ratio, this turbocharged and intercooled engine delivers a power output of 220 PS (162 kW; 217 hp) at 5000 rpm and 320 N⋅m (240 lb⋅ft) of torque from 1500 to 4800 rpm.

The engine uses CVVT technology and is controlled by the Bosch ME 9.0 engine management system. The turbocharger is integrated with the exhaust manifold, which is a departure from previous designs.

Ford adapted this engine for their use, with power outputs ranging from 220 PS (217 bhp) to 350 PS (345 bhp) and designations like “Duratec-ST”, “Duratec ST”, and “Duratec RS”.

Mk2 Ford Focus RS Engine Modifications The B5254T3 engine was revised and customized for use in the Ford Focus RS between 2009 and 2010.

These engines were not used in any Volvo models but were specifically designed for the Ford Focus RS. They were configured as an RNC version of the S60R/V70R B5254T4 engine.

Some notable changes included:

• a lower compression ratio through the use of different pistons
• strengthened connecting rods
• camshafts with the same geometry as the B5254T4 engine but with distinct (dual) VVT units
• a slightly larger Borg-Warner K16 turbo with an integrated manifold

Nonetheless, it did not outperform the K24 used in the B5254T4 S60R/V70R engine.

These modifications improved the engine’s performance in the Ford Focus RS, allowing for higher power output.

Applications

The B5254T3 Volvo engine was utilized in a range of models from both Volvo and Ford

• 2005–2008 Volvo S40 II (S40 T5)
• 2005–2008 Volvo V50 (V50 T5)
• 2007 Volvo C30 (C30 T5)
• 2006–2007 Volvo C70 (C70 T5)
• 2005–2011 Ford Focus (Focus ST225)
• 2007-2010 Ford Mondeo Mk4 (XR5 Turbo for the Australian market)
• 2007-2010 Ford S-Max
• 2009–2010 Ford Focus (Focus RS)
• 2011 Ford Focus (Focus RS 500)
• 2008–2012 Ford Kuga (Kuga 2.5T)

The Kuga 2.5T had varying Euro standards, with 2008-2010 models adhering to Euro 4 and 2011-2012 models complying with Euro 5.

The Australian Ford Kuga was equipped with the B5254T6 engine from 2008 to 2011.

Tuning & Performance Enhancements

The B5254T3 Volvo engine is highly tunable and enjoys robust aftermarket support. The Ford Focus ST and RS, Mondeo ST, and other Volvo models have a sizable tuning and modification community.

There are numerous tuning options and modifications available for the B5254T3 engine.

Some tuners have managed to push this engine to around 400-450hp with basic modifications, and others have reached an impressive 600-800hp or even higher.

There have even been instances of the B5254T3 engine achieving over 1,000hp.

Reliability & Issues

The B5254T3 engine is a 2.5-liter inline 5-cylinder engine renowned for its reliability and smooth operation. However, users have reported a few problems, including the following.

• Low fuel efficiency
• Turbocharger failure
• Cracked cylinder liners
• Dirty throttle body

1. Low Fuel Efficiency

The B5254T3 engine is not particularly fuel-efficient, and many users have noted that it consumes more fuel than comparable engines.

2. Turbocharger Failure

The turbocharger is a common point of failure on the B5254T3 engine, which can lead to decreased performance and increased engine wear.

3. Cracked Cylinder Liners

Some users have experienced cracks in the cylinder liners, which can result in engine damage and diminished performance.

However, a widely accepted fix for this issue, known as the “block mod”, has become prevalent in the tuning community.

4. Dirty Throttle Body

The throttle body regulates the airflow into the engine, and a dirty throttle body can cause reduced engine performance and fuel efficiency.

These are some of the most frequently reported issues with the B5254T3 engine. However, it’s essential to note that the engine is generally reliable and well-regarded by users.

Regular maintenance and proper engine care can help minimize these problems and keep the engine running smoothly for many miles.