BMW S65 4.6L Street Performance Stroker Engine

The CarBahn Autoworks S65 4.6L stroked and bored engine kit includes over-sized forged pistons, a forged crankshaft with increased stroke, and high-strength forged Carrillo connecting rods. The bore is increased to 94mm and the stroke is increased to 83mm. In addition, common S65 failure points are addressed with Clevite-Dinan racing rod bearings and CarBahn Autoworks valve springs. Steve Dinan has been building high performance and racing engines for BMW since 1977, winning 11 racing championships including 3 prototype championships and two 24 Hours of Daytona. The same engine shop that builds the racing engines also builds the street car engines; these talented engineers, machinists, and builders have built hundreds of engines from OEM street rebuilds to full-blown racing engines. The CarBahn Autoworks S65 4.6L stroked and bored engine kit includes over-sized forged pistons, a forged crankshaft with increased stroke, and high-strength forged Carrillo connecting rods. The bore is increased to 94mm and the stroke is increased to 83mm. In addition, common S65 failure points are addressed with Clevite-Dinan racing rod bearings and CarBahn Autoworks valve springs. Kit includes: Crankshaft, pistons (with rings, wrist pins, and circlips), connecting rods, rod bearings, valve springs, and MLS (multi-layer steel) head gasket.   Refer to the graphs below for the power results without catalytic converters on 100 octane race gas and using J607 (the typical aftermarket correction).   S65 4.6L Wet sump RPM TRQ HP 3500 373.4 248.9 4000 392.2 298.7 4500 393.9 337.5 5000 390.8 372.1 5500 399.0 417.8 6000 388.4 443.8 6500 382.4 473.3 7000 371.5 495.1 7500 358.6 512.1 7700 352.3 516.5 8000 337.4 514.0 No cats, 100 octane unleaded, J607         S65 4.6L Wet sump with race cams: RPM TRQ HP 3500 336.0 223.9 4000 353.0 268.9 4500 374.2 320.6 5000 392.8 374.00 5500 401.3 420.3 5600 404.6 431.4 6000 401.5 458.7 6500 402.3 497.9 7000 383.2 510.7 7500 367.5 524.8 8000 356.3 542.7 8200 348.8 544.6 No cats, 100 octane unleaded, J607       This engine can run with the stock oiling system and wet sump, but for even more power and increased reliability, CarBahn Autoworks recommends the use of our dry sump kit. This kit includes a Dailey Engineering billet oil pan and oil pump, plus additional pulleys and a drive belt.   S65 4.6L Dry Sump: RPM TRQ HP 3500 371.3 247.4 4000 382.1 291.0 4500 390.5 334.6 5000 398.3 379.1 5500 403.2 422.3 5600 403.6 430.3 6000 402.8 460.1 6500 395.6 489.6 7000 385.8 514.2 7500 373.3 533.1 8000 353.4 538.3 No cats, 100 octane unleaded, J607     S65 4.6L Dry Sump with Race Cams: RPM TRQ HP 3500 334.2 222.7 4000 343.9 261.9 4500 371.0 317.9 5000 400.3 381.1 5500 405.6 424.8 5600 405.8 432.7 6000 404.3 461.9 6500 399.8 494.8 7000 397.6 529.9 7500 398.4 568.9 8000 373.8 569.4 8200 366.0 571.4 No cats, 100 octane unleaded, J607 Engine core acceptance parameters Must be complete core (factory engine, from oil pan to valve cover) Block must have no: Holes or cracks in casting Holes or crack in covers Bore damage that cannot be honed out Thrust surface damage Journal surfaces damage Bolt hole damage that can’t be repaired Heads must have no: Holes or cracks in casting Holes or crack in covers Thrust surface damage Journal surfaces damage Bolt hole damage that can’t be repaired Additional repair charges could apply for damaged items that are not normally changed during an overhaul and cannot be repaired or serviced Valves Crankshafts Camshafts Guides ValveTronic mechanism Vanos mechanism