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
N20 Parts/Specs | N54 | N55 | S55 |
---|---|---|---|
Engine Bore Spacing of 91mm | Yes | Yes | Yes |
Engine Bore Size 84mm | Yes | Yes | Yes |
Engine Stroke of 90.091mm | No | No | No |
Displacement of 121.86 CID or 1.997L | No | No | No |
Connecting Rod Length 144.35mm Centre to Centre | No | Yes | Yes |
Connecting Rod Bearings | Yes | Yes | Yes |
Same Conrod Design | Yes | Yes | Yes |
Same Conrod Material | No | Yes (prior to F series N55) | No |
Same Main/Crank Bearings | No | No | No |
Same Conrod Bolts | Yes | Yes | Yes |
Same Head Studs/Bolts | No | Yes only the 11mm Bolts/Studs | Yes only the 11mm Bolts/Studs |
Same Intake Port Shape/Design and Dimension | Yes | Yes | Yes |
Same Exhaust Port Design | Yes | Yes | Yes |
Timing Chain Guides | No | No, Extremely close however | No, Extremely close however |
Identical Crank Hub | No | No, Extremely close however | No, Extremely close however |
Identical Engine Timing System Components | No | No, Extremely close however | No, Extremely close however |
EWG Solenoid | No | Yes | Yes |
PWG Solenoid | No | No, can be retrofitted for N55 Turbo Swaps | No |
FMIC | No | Yes | Yes |
Intake Valves | No | Yes | Same dimensions, but uses different material |
Valve Springs Intake | No | Yes | Yes |
Valve Stem Seals | Yes | Yes | Yes |
Valve Guides | No | No | No |
Valve Locks/Collet | Yes | Yes | Yes |
Valve Spring Plate Intake | Yes | Yes | Yes |
Intake Valve Rocker Arm | No | Yes | Yes |
Exhaust Valves | No | Yes | Same dimensions, but uses different material |
Valve Springs Exhaust | Yes | Yes | No |
Valve Spring Plate Exhaust | Yes | Yes | Yes |
Valvetronic/Valve lift Spring Tension Seating/Support Plate OE 11377583781 | No | Yes | Yes |
Exhaust Valve Rocker Arm | Yes | Yes | Yes |
Intake Camshafts Dimensions (Duration, Lift) | No | Yes | Yes |
Exhaust Camshaft Dimensions (Duration, Lift) | No | No | No |
Intake and Exhaust Vanos Adjustment Range | No | Yes | Yes |
Exhaust Side Hydraulic Lifters | Yes | Yes | Yes |
Intake Side Hydraulic Lifters | Yes | Yes | Yes |
Intake Valve Lift Variable Rocker Arms | No | Yes | Yes |