Steve Dinan has been building high performance and racing engines for BMW’s 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 4.7L S65 racing stroker engine is our peak of S65 development. A billet crankshaft gives an 84.5mm stroke, and the centered-pin low friction forged pistons have an 94mm bore and lightweight DLC-coated wristpins; this enlarges displacement to 4691cc. Carrillo forged racing connecting rods with CARR bolts are combined with CARBAHN Autoworks racing rod bearings to eliminate that major failure point.
This engine build also includes a special very high lift racing camshaft. This camshaft kit also includes a conversion to solid lifters, high performance valve springs with titanium retainers and 1mm over-sized racing valves. In addition, we do a valve job with new cam followers, timing chains, timing chain guides, timing chain tensioners and all associated seals and gaskets.
Note: This engine requires a dry sump system, such as the CARBAHN Autoworks Dailey Engineering dry sump kit.
Refer to the graphs below for the power results without catalytic converters on 100 octane race gas and using SAE J607 (the typical aftermarket correction).
S65 4.7L Dry Sump with race cams:
No cats, 100 octane unleaded, J607