Every set is built to order. Please allow five weeks for it to ship.
Diamond Pistons forged piston kit for the FA20 / 4U-GSE (BRZ / FR-S / 86), set of 4. 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: -14.5cc; compression height: 1.285 in.
Stroke: 86mm; rod length: 5.090 in.
Ring set: 1.20 mm x 1.20 mm x 2.00 mm
Wrist pin: 0.866 in. OD x 2.250 in. long
Valve pocket depth: 0.100 in. intake, 0.090 in. exhaust
Forging: full round
Rings, wrist pins and pin retainers included (per Diamond)
Per Diamond: pin oiling fed from the oil ring, pins fitted to the pistons, 3D-machined valve pockets, moly-coated skirts, wrist pins, locks and (where needed) oil-ring support rails included
Diamond part numbers:
36043-4: 86mm bore, standard pin, 9.50:1 compression (per Diamond), ring set 09573385, wrist pin G8662250180C
36043-4-H: 86mm bore, H13 pin, 9.50:1 compression (per Diamond), ring set 09573385, wrist pin H8662250225C
36044-4: 86.25mm bore, standard pin, 9.50:1 compression (per Diamond), ring set 09573395, wrist pin G8662250180C
36044-4-H: 86.25mm bore, H13 pin, 9.50:1 compression (per Diamond), ring set 09573395, wrist pin H8662250225C
36045-4: 86.5mm bore, standard pin, 9.50:1 compression (per Diamond), ring set 09573405, wrist pin G8662250180C
36045-4-H: 86.5mm bore, H13 pin, 9.50:1 compression (per Diamond), ring set 09573405, wrist pin H8662250225C
Specs and fitment: Piston kit, set of 4. -14.5cc, 1.285 in. compression height. Fits Subaru FA20 / Toyota 4U-GSE (BRZ, FR-S, 86). Ordered direct from Diamond Pistons; call 970-242-0919 to confirm fitment and lead time for your build.
