Turn the 2.5 liter M20 325i motor into a 3.1 liter for performance beyond a E36 M3 - the additional torque allows the to pull strongly below 3000 rpm. Kit includes crankshaft with 89.6mm stroke, light weight forged pistons, piston rings, high strength wrist pins and main bearings. You can use your factory 135mm long "i" rods, cylinder head, and fuel injection. Pistons are normally 1mm over size (85mm bore) and compression is 9.75 to 1.
Note: This kit requires modification of the block at the bottom of the bore for connecting rod clearance. We can supply kits with any combination of bore diameter and compression ratio by special order - call us.
Additional upgrades such as free flow air filter, MAF kit, larger throttle body, extrude-honed intake manifold, larger valves, performance cam, headers and free flow exhaust system will further improve performance.
See the options section, take advantage of our special price for a set of H-beam rods added to this kit (save $270).