This page will list any parts/engine designs that are similar in the N20/26 with the N55, N54, and S55.
Yes = Identical for given platform
No = Not identical for given platform
| B4x Gen 1 Parts/Specs | B4xTU | B48A20T01 (B48E) | B58 | B58TU | S58 |
|---|---|---|---|---|---|
| Engine Bore Spacing of 91mm | Yes | Yes | Yes | Yes | Yes |
| Engine Bore Size 82mm | Yes | Yes | Yes | Yes | No (84mm) |
| Engine Stroke of 94.6mm | Yes | Yes | Yes | Yes | No (90mm) |
| Displacement of 121.925 CID or 1.998L | Yes | Yes | No (2.998L) | No (2.998L) | No (2.998L) |
| Connecting Rod Length 148mm Centre to Centre | Yes | Yes | Yes | Yes | No (151.1mm) |
| Connecting Rod Bearings | Yes | Yes | Yes | Yes | Unknown |
| Same Conrod Design | Yes | No | Yes | Yes | No (Same as the S63B44T4) |
| Same Conrod Material (Forged) | Yes | Yes | Yes | Yes | Yes |
| Same Main/Crank Bearings | Yes | No | No | No | Unknown |
| Same Conrod Bolts | Yes | Yes | Yes | Yes | No |
| Same Forged Crankshaft | No | No, Unique specifically to B48E (larger journals) | No | No | No |
| Same Engine Compression (11 & 10.2CR) | Yes | No (9.5:1 CR) | Partially (11:1 CR) | Partially (11:1 CR) | No (9.3:1) |
| Cast Pistons | Yes | No, Forged | Yes | Yes | No, Forged |
| Same Head Studs/Bolts (M11) | Yes | Yes | Yes | Yes | Yes |
| Same Intake Port Shape/Design and Dimension | Yes | Yes | Yes | Yes | Yes |
| Same Exhaust Port Design | Yes | Yes | Yes | No | Yes |
| Timing Chain Guides | No, Same as the TU based engines | No, Same as the TU based engines | Yes | No, Same as the TU based engines | No, Same as the TU based engines |
| Identical Engine Timing System Components | No, Same as the TU based engines | No, Same as the TU based engines | Yes | No, Same as the TU based engines | No, Same as the TU based engines |
| EWG Solenoid | Yes | Yes | Yes | Yes | Yes |
| Intercooler | Yes (depending on engine orientation: longitudinal or traversal) | Yes (depending on engine orientation: longitudinal or traversal) | No, although does use Water to Air Intercooling | No, although does use Water to Air Intercooling | No, although does use Water to Air Intercooling |
| Intake Valves | Yes | Yes | Yes | Yes | Yes (Material Change) |
| Valve Springs Intake | Yes | Yes | Yes | Yes | No |
| Valve Stem Seals | Yes (Shared with the N20/26) | Yes (Shared with the N20/26) | Yes (Shared with the N20/26) | Yes (Shared with the N20/26) | Yes (Shared with the N20/26) |
| Valve Guides | Unknown | Unknown | Unknown | Unknown | Unknown |
| Valve Locks/Collet | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) |
| Valve Spring Plate Intake | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) | Yes (also shared with the N20, N55, S55) |
| Intake Valve Rocker Arm | Yes | Yes | Yes | Yes | Yes |
| Exhaust Valves | Yes | Yes | Yes | Yes | Yes (Material Change) |
| Valve Springs Exhaust | Yes | Yes | Yes | Yes | Yes |
| Valve Spring Plate Exhaust | TBD | TBD | TBD | TBD | TBD |
| Valvetronic/Valve lift Spring Tension Seating/Support Plate OE 11377583781 | TBD | TBD | TBD | TBD | TBD |
| Exhaust Valve Rocker Arm | TBD | TBD | TBD | TBD | TBD |
| Intake Camshafts Dimensions (Duration, Lift) | TBD | TBD | TBD | TBD | TBD |
| Exhaust Camshaft Dimensions (Duration, Lift) | TBD | TBD | TBD | TBD | TBD |
| Intake and Exhaust Vanos Adjustment Range | TBD | TBD | TBD | TBD | TBD |
| Exhaust Side Hydraulic Lifters | TBD | TBD | TBD | TBD | TBD |
| Intake Side Hydraulic Lifters | TBD | TBD | TBD | TBD | TBD |
| Intake Valve Lift Variable Rocker Arms | TBD | TBD | TBD | TBD | TBD |
| Uses a Diverter Valve, NO | NO | Yes (Only B4x and B5x Motor to use one) | NO | NO | TBD |