PPM-Racing (Pure Performance Motorsport) 4.2 liter S38 inline-6 stroker kit - $6900
The BMW S38 is one of (if not arguably the best) the most impressive inline-6 cylinder motors ever produced by BMW. We will leave that debate for another article however and instead give you the details on the PPM-Racing 4.2 liter stroker kit. It includes forged pistons, H-Beam connecting rods, and a billet 4340 crankshaft. It is applicable to either 3.6 or 3.8 liter S38 motors from the BMW E28 M5 and BMW E34 BMW M5 respectively.
The kit can be customized and accommodate naturally aspirated or boosted builds with compression ratio choices for the pistons including 8.0:1, 8.5:1, 10.0:1, 11.5:1, or 12.0:1. Piston sizes are either 94.5 or 95.0 mm. The kit is designed to use a 1x compression ring. Awesome? Yes, awesome.
- 6x forged pistons
- Rings, pins, locks
- 6x H-Beam connecting rods
- ARP2000 rod bolts
- 98mm Billet 4340 crankshaft