Honda Prelude H23A1 2.3L L4 Engine 12454E 1992-1993

Balance shaft front seal displacement and fiber reinforced metal cylinder wall scuffing trigger massive oil loss on non-VTEC sports coupes. The Honda Prelude H23A1 12454E Engine eliminates these catastrophic failures during commercial long block repower procedures. Producing 160HP, this 2.3L 4-Cylinder engine requires exact balance shaft phase gear timing to prevent secondary engine harmonic shake.

High density ASTM A356-T6 aluminum integrates carbon fiber matrix cylinder liners to withstand thermal cycling. This Honda engine core utilizes an induction-hardened AISI 4340 forged steel crankshaft stamped PT3 with a 14mm thread snout bolt. Starter electrical draw pulls 145A at 12V under standard bench testing. Dry unrigged weight totals 200 lbs within exterior dimensions of 36in length, 36in width, 36in height, with a 4.5 quarts oil pan volume.

Key Features of Honda H23A1

Fleet mechanics buy Honda H23A1 long block engines to eliminate chronic cylinder scoring during industrial engine rebuild projects. Specialized diamond honing preserves the integrity of the factory fiber reinforced metal cylinder walls for immediate piston ring seating.

- Block casting marked H23A1 and P13 provides verified factory dimensional accuracy.
- Crankshaft casting stamped PT3 features a 14mm diameter crank pulley attachment snout.
- Precision machined P14 cylinder head casting optimizes non-VTEC airflow velocity into combustion chambers.
- Pre-installed water pump and mechanical timing belt tensioner eliminate auto-tensioner hydraulic collapse.
- The H23A1 commercial core incorporates balance shaft seal locking retainers to prevent oil blowouts.
- DOHC 16-Valve valvetrain uses stellite faced exhaust valves to resist sustained thermal load.
- Tri-metal copper-lead bearings provide exceptional fatigue strength under high RPM operation.
- Multi layer steel head gasket maintains compression seal under elevated thermal expansion.

Dynamometer Output Testing Limits

Dynamometer testing documents 160HP at 5800 RPM and 156 ft-lbs torque at 4500 RPM under continuous dyno load schedules. Oil gallery operating pressure holds 55 PSI at an oil sump temp of 195°F. Cylinder compression testing registers 185 PSI across all four bores with variance restricted under 4%. Crankshaft main journal runout measures less than 0.0003in TIR along all bearing surfaces. This H23A1 long block engine keeps exhaust gas temp readouts below 1320°F during simulated road test validation runs.

Chassis Fitment Platform Scope

Precision fitment covers 1992 to 1993 Honda Prelude Si sports coupes on the fourth generation BB2 chassis platform. This long block bolts direct to factory 5-speed manual transaxles or 4-speed automatic transmissions, retaining original front engine mounting brackets, downpipe flanges, and intermediate axle shaft support locations without chassis fabrication.

Installation Protocols Maintenance Guide

Throttle cable linkage requires 4 lbs of linear pull tension for predictable pedal response. Technicians must note this long block is NOT engineered for VTEC H22A1 Prelude VTEC chassis, nor will it accept 1994 to 1996 16mm snout crankshaft pulleys due to the specific 14mm snout bolt thread size.

- Drain initial break-in petroleum motor oil after the first 500 miles or 20 hours.
- Set cold mechanical valve lash to 0.004in intake and 0.007in exhaust on the dual overhead camshafts.
- Verify front balance shaft seal retainer clip placement prior to installing outer timing belt covers.

Warranty Verification Crate Contents

Supported by an industry leading 3-Year 100,000-mile parts warranty, each engine fulfills strict Honda assembly standard protocols. The heavy duty wooden shipping crate contains the long block core, oil pan, water pump, timing belt assembly, valve cover, oil pickup tube, and signed dynamometer test documentation.