Mitsubishi 4G63T Engine Specs

The Mitsubishi 4G63T is a 2.0-liter turbocharged inline-four petrol engine produced from 1988 to 2007, and one of the most celebrated and widely modified Japanese performance engines of all time thanks to its central role in the Mitsubishi Lancer Evolution I through IX and the first two generations of the Eclipse. Alongside its naturally aspirated siblings used in the Galant and Outlander, the turbocharged 4G63T became legendary in rally and grassroots motorsport circles for its combination of a genuinely strong iron block and remarkable tuning headroom.

Across the various Evolution generations, output climbed from around 195hp in earlier applications up to 291hp in the most powerful factory Evo variants, with torque between 278 and 407Nm, achieved through DOHC 16-valve architecture and compression ratios lowered to as little as 7.8:1 in the highest-boost versions to safely support increased turbo pressure. The 4G63T's rally pedigree - closely associated with Mitsubishi's World Rally Championship program - and its reputation for handling significantly more power than its factory rating with the right supporting modifications made it one of the definitive tuner engines of the 1990s and 2000s, comparable in status to Nissan's RB and SR engine families from the same era.

Ownership of a 4G63T today requires awareness of several well-known issues. The timing belt is critical, as this is an interference engine, and must be replaced strictly on schedule to avoid catastrophic valve damage. The infamous "crankwalk" issue affects certain 7-bolt crankshaft variants, where thrust bearing wear allows excessive crankshaft end-play; this is a well-documented weak point that experienced Evo and Eclipse owners specifically check for, and it's one of the first things a knowledgeable buyer should ask about. Turbo lag is noticeable by modern standards, characteristic of the era's turbocharger technology, and the engine generally demands more attentive, higher-frequency maintenance than a naturally aspirated equivalent - oil and coolant quality matter considerably to long-term reliability, especially on modified examples. Turbocharger oil and coolant lines should be inspected periodically, and any engine that has been tuned for higher boost needs a correspondingly upgraded cooling system to manage the additional heat reliably. Careful, professional tuning is essential; the 4G63T's strong iron block tolerates significant power increases, but only when paired with appropriate supporting modifications and a properly calibrated engine management system.