2.3L Stroker EcoBoost Engine Assemblies

ENGINE OVERVIEW:

Mountune's extensive knowledge of the Ford EcoBoost engines coupled with our comprehensive motorsport experience provides the foundation for our stroked 2.3L Ford EcoBoost engine assemblies.

Each long block starts off as a brand new aluminum Ford Focus ST engine block. To ensure excellent gasket sealing, we de-burr all edges and then resurface the head gasket sealing surfaces on both the engine block and cylinder head.

All rotating components including the crankshaft, connecting rods, and pistons are all dynamically balanced to Formula One standards at 0.5 grams. All critical dimensions such as bearing clearance are measured and set for optimized performance.

Increased Displacement for More Power and Torque

The mountune Focus ST stroker engine is then skillfully assembled with mountune Focus RS forged pistons, Focus RS forged connecting rods, tri-metal racing bearings, and a keyed OEM Focus RS crankshaft to increase the engine's overall displacement to 2.3 liters.

Engine Specifications:

MACHINED FOR OPTIMIZED AIRFLOW

Each High Performance 2.3L Stroker MRX Long Block is topped with a mountune MRX Cylinder Head. A factory Focus ST cylinder block that has undergone our precision MRX machining service for the best possible performance, increasing intake airflow by 44% and exhaust airflow by 19%.

The mountune MRX cylinder head for the Focus ST also features high-performance black nitrided intake valves, sodium inconel exhaust valves, along with our motorsport valve stem seals, and your choice of V2 or V3 camshafts.

This engine is the perfect foundation for your Focus ST for high boost applications including track day use or as a direct replacement for your tired original engine.

Camshaft Information

• V2 Camshafts offer good all around drivability while providing excellent power and response. We recommend these for most applications.
• V3 Camshaft option works well with larger than stock turbochargers and enhances high RPM power level. Because of the longer duration and higher lift, rough idle should be expected and considerable tuning effort may be required for these camshafts to function correctly.

Comparison Chart:

Additional Photos: