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 | No, 146mm Centre to Centre | 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 | Newer Composition of the IROX Drop Forged Rods | Yes | Yes | Yes |
Same Main/Crank Bearings | Yes | No - Same as B58 although Thrust bearing is marked as different part number | No | No | Unknown |
Main Caps | Yes | No - Same as B58 | No | No | No |
Same Conrod Bolts (Same as the M54, N20, N55, S55, etc) |
Yes | Yes | Yes | Yes | No |
Same Forged Crankshaft | No | No, Unique specifically to B48E (larger journals - 55mm vs 50mm) | No | No | No |
Same Engine Compression (11 & 10.2CR) - Mahle Evotec 1 Design | Yes, but uses an improved design (Mahle Evotech 2) | No (9.5:1 CR high silicone and unique casted process - similar setup to S55 pistons.) | Partially (11:1 CR) | Partially (11:1 CR) | No (9.3:1) |
Cast Pistons | Yes, also has a casted steel top ringland groove |
Yes - however refer to above cell
Also has a casted steel top ringland groove |
Yes | Yes | No, Forged |
Same Head Studs/Bolts (M11) | Yes | Yes | Yes | Yes | Yes |
Same Intake Port Shape/Design and Dimension | Yes | Yes - However, Mini Cooper/transverse mounted B48s have slightly different angled intake ports due to intake manifold space constraints | 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 but uses exclusively an air to air intercooler. (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 (Known as Milvs to some) | Yes | Yes | Yes | Yes | Yes |
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 |
TBD | TBD | TBD | TBD | TBD | TBD |
Valvetronic/Valve lift Spring Tension Seating/Support Plate OE 11377583781 | Yes | Yes | TBD | TBD | TBD |
Exhaust Valve Rocker Arm | Yes | Yes | TBD | TBD | TBD |
Intake Camshafts Dimensions (Duration, Lift) | Yes | Yes | TBD | TBD | TBD |
Exhaust Camshaft Dimensions (Duration, Lift) | Yes | Yes | TBD | TBD | TBD |
Intake and Exhaust Vanos Adjustment Range | Yes | Yes | TBD | TBD | TBD |
Exhaust Side Hydraulic Lifters | Yes | Yes | TBD | TBD | TBD |
Intake Side Hydraulic Lifters | Yes | Yes | Yes | Yes | Yes |
Intake Valve Lift Variable Rocker Arms | Yes | Yes | Yes | Yes | Yes |
Uses a Diverter Valve, NO | NO | Yes (Only B4x and B5x Motor to use one) | NO | NO | TBD |
Cylinder Head (Non Mini Cooper) | NO | NO | NO | NO | NO |
Cylinder Head (Mini Cooper) | NO | NO (same head as TU - Mini Cooper) | NO | NO | NO |