Mitsubishi Evo 8-9 4G64 2.3L Stroker Crankshaft

Mitsubishi Evo 8 and Evo 9 4G64 100mm Stroker Crankshaft

This 100mm 4G64 crankshaft can be used in two different Mitsubishi Evo engine configurations:

• 2.3L Evo stroker build: When used in an 85mm-bore Evo 4G63 block, the calculated capacity is approximately 2270cc. Mitsubishi owners and engine builders commonly refer to this conversion as a 2.3L stroker.
• 2.4L 4G64 build: When used in a standard 86.5mm-bore 4G64 block, the calculated capacity is approximately 2351cc. This is normally described as a 2.4L 4G64 engine.

This difference explains why Evo 8 and Evo 9 owners usually describe a 100mm crank conversion as a 2.3 stroker, while an engine built around the complete 4G64 block is called a 2.4L build.

This listing supplies an aftermarket 7-bolt 4G64 crankshaft with a 100mm stroke. It can be used for fast-road, track and drag projects when the block, pistons, bearings, clearances and engine management are correctly specified for the intended build.

This is not a complete stroker kit and it is not the previous “easy stroker” package. Only the crankshaft and the options selected above the Add to Cart button are supplied.

Common Mitsubishi Evo Applications

The 100mm crank conversion is most commonly discussed for Evo 8 and Evo 9 2.3L stroker builds. It can also be used in other compatible Evo IV to Evo IX 4G63 or 4G64 engine projects. Compatibility must be confirmed from the engine block and internal specification rather than the vehicle model alone.

• Mitsubishi Lancer Evo IV / Evo 4 – CN9A
• Mitsubishi Lancer Evo V / Evo 5 – CP9A
• Mitsubishi Lancer Evo VI / Evo 6 – CP9A
• Mitsubishi Lancer Evo VII / Evo 7 – CT9A
• Mitsubishi Lancer Evo VIII / Evo 8 – CT9A
• Mitsubishi Lancer Evo IX / Evo 9 – CT9A
• Mitsubishi Evo IX Wagon – CT9W

This crankshaft is not suitable for the Evo X 4B11T engine. Mitsubishi produced several versions of the 4G63 and 4G64. Always confirm the block type, 7-bolt configuration, crank sensor arrangement, thrust bearing design and journal measurements before ordering.

What Is Included?

• One aftermarket 7-bolt 4G64 crankshaft
• 100mm crankshaft stroke
• STD main bearing set when the bearing option is selected
• STD big-end bearing set when the bearing option is selected
• Split thrust washers when the bearing option is selected

Pistons, piston rings and fasteners are not included. An oil pump and gasket are only included when selected from the available product options.

100mm Crankshaft Capacity Guide

The final capacity always depends on the finished cylinder bore. Any overbore must be approved by the machine shop after the block has been measured and inspected.

Crankshaft Technical Information

Why Use a 100mm Crank in an Evo Build?

• More engine capacity than the original 2.0L Evo engine
• Stronger low and mid-range torque when correctly built and tuned
• Earlier boost response with many larger turbo combinations
• Improved road response without depending on very high RPM
• A useful base for fast-road, track and drag projects

Installing a 100mm crankshaft does not produce a fixed power figure. Turbo size, cylinder head flow, camshafts, compression ratio, fuel system, boost control and ECU calibration all affect the final result.

How Customers Have Used These Crankshafts

We have supplied these crankshafts for Evo 5 and Evo 6 fast-road projects where the customer wanted more torque and earlier turbo response. Evo 7 and Evo 8 customers have used 100mm-stroke engines with larger turbochargers for responsive road and track builds.

Evo 8 and Evo 9 projects are among the most common applications. Some customers build a 2.3L stroker around the original Evo-style block. Others use a 4G64 block as the base of a complete 2.4L engine. Evo IX MIVEC projects require particular attention to the timing arrangement and available cam adjustment.

Proven in high-power builds: We have sold dozens of these 100mm 4G64 crankshafts for high-power Mitsubishi Evo engine projects. They have been used in engines rated at 670+ whp and we have had good results from the crankshafts supplied.

This sales history should not be treated as a fixed or guaranteed power rating. Reliability at this level depends on the block preparation, pistons, bearings, clearances, balancing, oil system, ECU calibration and the way the engine is used.

Planning a 2.3L Evo Stroker Build

A 100mm crankshaft changes the piston position and engine geometry compared with the original 88mm-stroke 4G63. The standard piston arrangement must not be assumed to work with the longer stroke.

The pistons must be suitable for the 100mm stroke, finished bore, block deck height, cylinder head and required compression ratio. The engine should be dry-built so the machine shop can measure deck height, internal clearance and piston-to-valve clearance before final assembly.

This is not a weekend drop-in conversion. The complete rotating assembly should be specified, measured and balanced by an experienced Mitsubishi engine builder.

Planning a 2.4L 4G64 Evo Build

The 4G64 block is taller than the Evo 4G63 block. Many 2.4L Evo builds combine a 4G64 block with a compatible Evo cylinder head. The additional block height can affect the timing belt, tensioner position and final cam timing.

The engine builder should also check the head gasket bore, oil and coolant passage alignment, compression ratio, piston-to-valve clearance, oil supply and the timing arrangement. Evo IX MIVEC operation and available cam adjustment must be verified during assembly.

Important Engine Build Checks

• Measure every crankshaft journal before selecting the bearings
• Check main and big-end bearing clearances
• Check crankshaft end float and the thrust washer arrangement
• Dry-build the engine and check internal and block clearance
• Measure piston deck height and piston-to-valve clearance
• Inspect the oil pump and the complete oil supply system
• Dynamically balance the complete rotating assembly
• Check the timing system carefully before starting the engine
• Retune the ECU for the increased capacity, airflow and torque

RPM, Torque and Drivetrain Advice

The 100mm stroke produces higher mean piston speed than the original 88mm-stroke Evo engine at the same RPM. There is no single safe rev limit for every build. The correct limit depends on the complete internal specification, bearing clearances, balancing, oil control, cylinder head and intended use.

The additional capacity can also produce a strong increase in mid-range torque. This places more load on the clutch, gearbox, transfer case and differentials. Where supported by the ECU, boost by RPM or boost by gear can be used to manage the torque delivery.

Before You Order

• Confirm that your project requires a compatible 7-bolt 100mm crankshaft
• Confirm whether you are building a 2.3L 4G63 stroker or a 2.4L 4G64 engine
• Confirm whether you require the STD bearing option
• Check the block and crankshaft measurements with your machine shop
• Ask your engine builder to approve the complete engine specification
• Check all product pictures and selected options before ordering