Mitsubishi Evo 8-9 4G64 2.3L Stroker Crankshaft

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

We supply this aftermarket 7-bolt 4G64 crankshaft with a 100mm stroke for compatible Mitsubishi Evo engine builds. It is based on reference MD346026. Choose the crankshaft on its own or add the available bearing and oil pump options above the Add to Cart button.

In an 85mm-bore 4G63 block the 100mm stroke gives approximately 2270cc. This is commonly called a 2.3L Evo stroker. In an 86.5mm-bore 4G64 block it gives approximately 2351cc and is usually described as a 2.4L build.

This listing supplies the crankshaft and your selected options. It is not a complete stroker kit or the previous “easy stroker” bundle. Pistons, piston rings and fasteners are not included.

Crankshaft and kit options

Check the selected options before ordering. STD bearings still need to be matched to the measured journals and bearing housings. The supplied split thrust washers must suit the block's thrust bearing arrangement.

Mitsubishi Evo applications

Evo 8 and Evo 9 2.3L stroker projects are common applications. This crankshaft can also be used in other compatible Evo 4 to Evo 9 engine builds. The models below identify projects to check rather than standard replacement fitment.

Confirm compatibility from the engine fitted and the intended internal specification. Mitsubishi made different 4G63 and 4G64 versions. Your builder must check the block, 7-bolt flywheel mounting, crank sensor arrangement, thrust bearing design and journal dimensions.

This crankshaft is not suitable for the Evo X 4B11T engine. A 4G64 engine code alone does not establish compatibility with every 4G64 crankshaft or block.

Capacity with a 100mm stroke

Capacity depends on the finished bore. These figures do not specify an allowable overbore. Have the block inspected and measured before choosing the piston size.

Building a 2.3L 4G63 stroker

The original Evo 4G63 has an 88mm stroke. Changing to 100mm increases the crank throw by 6mm. With the same rod and piston dimensions the piston would therefore travel 6mm further towards the cylinder head and 6mm further down the bore.

The rods and pistons must be specified together for the longer stroke. Choose the piston compression height to suit the rod length and measured block deck height. A piston labelled “4G63” is not enough to confirm it will work in a stroker build.

Dry-build the rotating assembly and check piston deck height, piston-to-valve clearance and clearance around the block, rods and counterweights. Where piston cooling jets are fitted check their clearance throughout the rotation too. Have the complete assembly balanced before final fitting.

Building a 2.4L 4G64 Evo engine

A compatible 4G64 block is taller than the Evo 4G63 block. Combining it with an Evo cylinder head changes the geometry of the timing drive. The builder must establish the correct belt and tensioner arrangement and verify the actual cam timing.

Check the head gasket bore, oil and coolant passages, compression ratio and piston-to-valve clearance. For an Evo IX MIVEC head also verify the oil supply and the cam timing through the intended MIVEC adjustment range.

Owners discuss these timing differences in this EvolutionM discussion of the 4G64 block's effect on cam timing. Use it as background for planning with your builder. The timing setup must be checked on the assembled engine.

Torque, turbo response and engine speed

The additional capacity can help produce more low and mid-range torque and earlier boost response with a suitable turbo combination. The result depends on the cylinder head, camshafts, compression ratio, turbo and ECU calibration. The crankshaft alone does not establish a power figure.

At the same RPM a 100mm stroke gives approximately 14% higher mean piston speed than an 88mm stroke. Set the rev limit for the complete engine specification and intended use. There is no single safe RPM limit for every stroker build.

Plan the torque delivery around the clutch, gearbox, transfer case and differentials. Boost control by RPM or gear can help manage the load where the ECU supports it.

Our experience with these crankshafts

We have supplied these crankshafts for Evo 5 and Evo 6 fast-road projects and Evo 7 and Evo 8 road and track builds using larger turbochargers. Evo 8 and Evo 9 customers have used them in both 2.3L stroker engines and complete 2.4L builds based on a 4G64 block.

We have sold dozens for high-power Mitsubishi Evo projects. They have been used in engines rated at 670+ whp and we have had good results from the crankshafts supplied. This is our sales experience rather than a guaranteed power rating. Reliability depends on the complete build, tuning and use.

Before ordering and assembly

• Have your builder approve the crankshaft, block, rods and piston combination.
• Measure every journal and check main and big-end bearing clearances.
• Confirm the thrust bearing arrangement and measure crankshaft end float.
• Dry-build and measure deck height and internal clearances before final assembly.
• Inspect the oil pump and oil supply system.
• Balance the rotating assembly and verify the timing setup.
• Retune the ECU for the increased capacity and intended torque delivery.
• Check the product pictures and select the bearing and oil pump options you require.