Every set is built to order. Please allow five weeks for it to ship.
Diamond Pistons forged piston kit for the BMW S50B32 3.2L, set of 6. ASF Machine orders these direct from Diamond for your build (not a stocked item). Diamond builds its sport compact pistons from forged 2618 aluminum, CNC-machines them, and pairs them with Trend Performance wrist pins.
Piston volume: -22.5cc; compression height: 1.270 in.
Stroke: 91mm; rod length: 5.472 in.
Ring set: 1.00 mm x 1.20 mm x 2.80 mm
Wrist pin: 0.8267 in. OD x 2.250 in. long
Valve pocket depth: 0.225 in. intake, 0.225 in. exhaust
Forging: full round
Rings, wrist pins and pin retainers included (per Diamond)
Crowns are 3D-milled, so the pistons come ready to install
Offset pin bores for quieter running
Moly-coated skirts to reduce friction and skirt wear
Side gas ports to help ring seal
Diamond's compression ratios assume a .068 in. head gasket and 8.503 in. deck height
Top ring down: .345 in.
Wrist pins (chamfered for round-wire locks) and locks included
Valve pockets cut oversize to clear larger-than-stock valves
Forged from 2618 aluminum for high-horsepower, nitrous and boosted builds
Diamond part numbers:
83104-6: 86.5mm bore, standard pin, 9.40:1 compression (per Diamond), ring set 09513405, wrist pin G82672250180C
83104-6-H: 86.5mm bore, -H pin (H82672250225C), 9.40:1 compression (per Diamond), ring set 09513405, wrist pin H82672250225C
83105-6: 87mm bore, standard pin, 9.50:1 compression (per Diamond), ring set 09513425, wrist pin G82672250180C
83105-6-H: 87mm bore, -H pin (H82672250225C), 9.50:1 compression (per Diamond), ring set 09513425, wrist pin H82672250225C
Specs and fitment: Piston kit, set of 6. -22.5cc, 1.270 in. compression height. Fits BMW S50B32 3.2L. Ordered direct from Diamond Pistons; call 970-242-0919 to confirm fitment and lead time for your build.
