AMS Mitsubishi Lancer Evolution IV/V/VI/VII/VIII/IX 2.3RR Motor The AMS EVO IV-IX 2.3RR Motor is an AMS EXCLUSIVE! This is the ultimate in road racing power plants providing low RPM torque AND top end horsepower. The idea behind this project was to design and build an engine that has the RPM range of a 2.0L and the low RPM torque of a stroker. Rod ratio, rod length, and bore to stroke ratio were optimized to support high volumetric efficiency at all RPMs. What we ended up producing was an engine with the broadest power band in the industry! No expense was spared on this motor. It is stuffed full of only the absolute BEST parts available. The foundation of this motor is an extended deck height block expertly machined to AMS specifications. Extra thick cylinder walls are bored and honed to accept 2.3RR specific Ross racing pistons which are hard anodized and have a friction reducing skirt coating applied. The pistons have been specially designed for strength while reducing weight to minimize stress on wrist pins, rods and bearings. Our custom length 4130 billet rods are held to the crank with ARP 625+ Custom Age rod bolts. The rotating assembly is specifically designed for high strength and is meticulously balanced to the gram. Features * AMS prepped extended deck height block with custom oil squirters * Copper O-ringed deck * Crank is knife edged and gun drilled for weight reduction * AMS spec Ross pistons with slipper skirt for shorter, lighter wrist pin * Choice of compression ratios * 2.27 L displacement * No core charge required * Comes completely assembled and balanced Includes * Extended deck height block completely machined * * Custom stroke 4130 billet crank * Custom 4130 billet rods * AMS spec Ross pistons * * ARP Main studs * Custom MLS head gasket for proprietary bore size * New Mitsubishi oil pump * New Mitsubishi water pump * AMS race balance shaft * Full assembly by AMS * Detailed installation guide Specifications * 9.25:1 - Is good for most street and race applications. This can be tuned to make great power on pump gas & race gas. * 10.0:1 - Provides great power and response on race gas for track or strip. This can be run on pump gas with caution. (93+ octane only). * 2.27 L displacement Applications * Mitsubishi Evolution 4, 5, 6, 7, 8, 9 * Fits all USDM, JDM and European models Part Number: AMS23RRSBEVO89
