The 4G63T, Generation by Generation: How Mitsubishi's Iron-Block Legend Went From Galant VR-4 to Evo IX

Every 4G63T Evo shares the same basic recipe: a 2.0-liter iron block with an 85 mm bore and 88 mm stroke, an aluminum head, and a turbo hanging off the side. That combination started out in the 1980 Lancer EX 2000 Turbo as a single-cam street engine, picked up a DOHC head in the 1987 Japanese-market Galant, and went on to power every Lancer Evolution from the Evo I in 1992 through the Evo IX in 2007. Along the way it helped win four straight WRC drivers' titles, which isn't bad for an engine that got its start in a family sedan.

What makes the 4G63T confusing today is that Mitsubishi never stopped changing it. Rod and crank design, turbo rotation, cams, fueling, and eventually variable valve timing all moved from one generation to the next, and every one of those changes still decides what bolts onto what. If you're shopping for a 4G63 car, or trying to work out why a part fits one Evo and not another, this is the history that explains it.

Quick Reference: 4G63T Generations at a Glance

*Converted from the JDM rating in PS (1 PS ≈ 0.986 hp). Calculated, not an official Mitsubishi hp figure.

Where It Started: The SOHC 4G63 Turbo (1980–1987)

The 4G63 didn't start as a rally engine. It started as one of Mitsubishi's everyday four-cylinders, built as a 1,997 cc engine in both SOHC and DOHC form, naturally aspirated or turbocharged. The early turbo car was the Lancer EX 2000 Turbo, and at this point it was a single-cam street engine with nothing about it that said rally car. What it did have was the bottom end: an iron block with an 85 × 88 mm bore and stroke, a combination that would still be in production almost three decades later.

Galant VR-4: The DOHC 4G63T Arrives (1987–1992)

The Galant VR-4 is where the 4G63T took the form most people know today. The Evo gets the credit, but the DOHC head, the AWD layout, and the rally homologation program all started here. The first DOHC turbo version ran a 7.8:1 compression ratio and a TD05H-14B turbo on manual cars, with about 8.7 psi of peak boost. It made 195 hp, and a 1989 ECU update raised that to 220 hp.

What it means for your build: The 14B turbo, the DOHC head, and the AWD drivetrain came from this car and went straight into the first Evo.

1G DSM: The 6-Bolt and the 7-Bolt (1990–1994)

This is where the most talked-about 4G63 detail comes from. The Eclipse, Talon, and Laser brought the DOHC turbo engine to the US in 1989 through Diamond Star Motors, a joint venture between Mitsubishi and Chrysler. Engines built from 1990 through April 1992 used thicker connecting rods and six bolts to attach the flywheel to the crank. Engines from May 1992 on used lighter rods and seven bolts.

That's all "6-bolt" and "7-bolt" means. The count refers to flywheel bolts, not head bolts, whatever you've read on forums. The 7-bolt showed up for the last couple of model years of the 1G, then became the only option once the 2G arrived in 1995. Early 6-bolt blocks are still in demand for high-power builds.

Evo I: The 4G63T Moves Into the Lancer (1992–1994)

The Evo I took the Galant VR-4's 2.0L DOHC turbo engine and AWD system and put them in the smaller, lighter Lancer body. It made 250 PS (about 247 hp) at 6,000 rpm and 228 ft-lb at 3,000 rpm. Mitsubishi planned 5,000 cars for homologation; the first 2,500 sold out in about three days, and total sales ended up past 7,600. The goal was Group A homologation, and that gave the whole Evo line its direction: build what the rally team needs, then sell enough road cars to make it legal.

Evo II: More Boost, Better Chassis (1994–1995)

The Evo II was mostly a chassis update, with a small power bump on top. Mitsubishi adjusted the wheelbase, revised the swaybar setup, added a larger spoiler, and fitted wider tires. Power rose to 260 PS (about 256 hp) from the same engine, and torque stayed put.

Evo III: Higher Compression and a Bigger Compressor (1995–1996)

The Evo III brought the first significant change inside the engine since the Evo I. Compression went up and the turbo got a larger compressor wheel, which raised output to 270 PS (about 266 hp) at 6,250 rpm with torque unchanged at 228 ft-lb. The Evo III turbo became a popular upgrade in its own right; the DSM community still uses it as the benchmark for a bolt-on 16G swap.

This is also where the rally results took off. Tommi Mäkinen won four consecutive WRC drivers' titles from 1996 to 1999, driving the Evo III, IV, V, and VI.

2G DSM: The 4G63T Splits From the Evo (1995–1999)

While the Evo kept getting more aggressive, the US 4G63T went a different way. The 2G Eclipse GSX and Talon TSi used the 7-bolt engine with a smaller TD04-13G turbo and were rated around 210 hp with the manual. The Evo was being built for rally stages. The 2G was built for the street and for emissions, which is why a stock 2G spools earlier and runs out of turbo sooner than the Evos of the same era.

What it means for your build: 7-bolt 2G engines are known for crank walk, where the crankshaft's thrust bearing wears and the crank moves forward and back. If you're buying one, check crank end play before you spend money on anything else.

Evo IV: The Engine Turns Around (1996–1998)

The Evo IV brought the biggest layout change in the engine's history. When the Lancer platform was redesigned, Mitsubishi rotated the engine and transaxle 180° to improve weight balance and cut torque steer. A new twin-scroll turbo helped response and raised output to 280 PS (about 276 hp) and 260 ft-lb, and Active Yaw Control debuted on the GSR.

Rotating the engine also reversed the turbo. From the Evo IV on, the turbo spins counterclockwise, which is what the "R" in its TD05HR designation stands for. Every factory turbo from the Evo IV through the Evo IX is a twin-scroll design.

What it means for your build: Turbos and exhaust manifolds from the Evo I–III and the DSMs won't swap onto an Evo IV–IX, and the reverse is also true.

Evo V: Fueling and Internals Get Serious (1998–1999)

Officially the power figure didn't change. Almost everything underneath it did. Mitsubishi reinforced the engine, increased cam duration, and fitted lighter pistons. The 510cc injectors were replaced with 560cc units for more headroom, and a flash-ROM ECU allowed more boost from the same turbo. Torque rose to 275 ft-lb, and the turbine housing grew from 9 cm² to 10.5 cm².

What it means for your build: The Evo V is where the factory started treating fuel as a limiting factor. Those 560cc injectors carried all the way through the Evo IX, which is a big part of why injectors are one of the first upgrades on any 4G63 Evo chasing real power.

Evo VI and Tommi Mäkinen Edition: Built to Survive Heat (1999–2001)

The Evo VI focused on keeping the engine alive under sustained load. It got a larger intercooler, a larger oil cooler, and new pistons. The RS got a titanium-aluminide turbine wheel, the first ever used in a production car. The Tommi Mäkinen Edition celebrated his four championships and added a smaller titanium-aluminide turbine for quicker spool, a lower ride height, and faster steering.

Evo VII: A Heavier Car, a Stronger Pull (2001–2003)

Rule changes in rallying meant the road car no longer had to be the race car. The Evo VII moved to the larger Lancer Cedia platform and gained weight. To make up for it, Mitsubishi added an active center differential, and engine changes that improved airflow raised torque to 282 ft-lb. The GSR's turbine housing went back down to 9.8 cm², which traded some top-end flow for earlier spool.

Evo VIII and VIII MR: The 4G63T Comes to America (2003–2005)

The Evo VIII was the first Evolution sold in the United States, rated at 271 hp. The US cars ran less boost and timing than the Japanese versions to meet emissions rules, which is one reason a tune on a stock US Evo VIII shows such big gains.

The MR is the one to look for. It added a larger turbo inlet, revised cam profiles, lighter balance shafts, and a dual wastegate solenoid in place of the single unit. The JDM MR also got the 10.5 cm² turbine housing. In a lot of ways it's a preview of the Evo IX, which carried over much of the MR's hardware.

Evo IX: MIVEC and the Final 4G63T (2005–2007)

The Evo IX was the last and most refined version of the engine. It added MIVEC variable valve timing and a revised turbo, the TD05HRA-16G6C-10.5T, and torque rose to 289 ft-lb. MIVEC changes intake cam timing only, not valve lift, which improves low-end response and fuel economy. The RS version used a titanium turbine with a magnesium-alloy compressor wheel.

US cars were rated at 286 hp. In Japan the car was still advertised at 280 PS (about 276 hp) under the Japanese automakers' gentlemen's agreement, and the real number was almost certainly higher; Mitsubishi had been underrating the Evo for a few generations by then.

What it means for your build: The Evo IX is the easiest 4G63T to drive on the street, thanks to the fastest spool, the broadest powerband, and the most refined factory tune. That's why clean examples cost what they do.

After the 4G63: Evo X and the 4B11T

The Evo X switched to the all-new aluminum 4B11T in 2007 in Japan and 2008 elsewhere. The 4G63 itself didn't disappear completely; a Chinese-built SOHC 16-valve turbo version, the 4G63S4T, stayed in production at a Mitsubishi joint venture in Shenyang. For enthusiasts, though, the story ends with the Evo IX.

Building a 4G63 Today

The youngest of these engines is pushing 20 years old, and the oldest are past 45. After that many years of swaps and rebuilds, the engine in the bay doesn't always match the car it's sitting in, so check the parts, not the paperwork. Before you pick a power target, get four answers: 6-bolt or 7-bolt (and on a 7-bolt, how much crank end play it has), MIVEC or non-MIVEC head, which way the turbo spins, and when the timing belt was last done. Sort those out first and every part decision after them gets a lot easier.

If something doesn't add up, our support folks can help you figure out what you've got.

4G63 FAQ

What is the difference between a 6-bolt and 7-bolt 4G63?

The difference is the number of bolts holding the flywheel to the crankshaft. Engines built from 1990 through April 1992 have six flywheel bolts and thicker rods. Later engines have seven bolts and lighter rods.

Which Evos have the 4G63T?

Every Evolution from the 1992 Evo I through the Evo IX used the 4G63T. The Evo X changed to the 4B11T.

Can I put an Evo turbo on a DSM?

An Evo I–III turbo spins the same direction as a DSM turbo and bolts up, which is why the Evo III 16G is such a common swap; plan on fueling and a tune to match. Evo IV–IX turbos spin in reverse and use twin-scroll housings, so fitting one to a DSM takes significant custom work.

Which Evo has the best 4G63?

If we're building one for power, we'd start with an Evo VIII MR; it's got the strongest non-MIVEC setup and the fewest variables. If it's going to be a street car first, the Evo IX's MIVEC makes it the easiest to live with. The right one depends on your build goal and budget.

Is the 4G63 an interference engine?

Yes. It uses a timing belt, and a belt failure can bend valves, so stay on top of the replacement interval.