K24 · 2.4 NA I4 swap. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Honda K24A2 swap (Civic / Integra) is rated 205 hp (SAE net (205 hp, TSX donor; secondary listing) · US market) at 7,000 rpm and weighs 2,500 lb (site estimate for a stripped EG/EK swap chassis, unverified; no manufacturer figure applies to a swap), or 12.2 lb/hp. On enthusiast estimates its stock internals are taken to about ~500 hp, the fuel system to around ~280 hp, and its naturally aspirated setup is taken to about ~285 hp before forced induction. Below: the sourced spec sheet, the limit sheet carbuildcheck analyzes against, and the platform's community-documented weak points.
Units
01 Spec sheet sourced
EngineK24 · I4
Engine codeK24A2
Bore × strokenot sourced in this audit
Compressionnot sourced in this audit
Inductionnaturally aspirated
Fuel systemport
Rated power205 hp · SAE net (205 hp, TSX donor; secondary listing) · US market @ 7,000 rpm
Torque164 lb-ft
Redlinenot sourced in this audit
Transmissionswap-dependent (6MT typical)
DrivetrainFWD
Curb weight2,500 lb · site estimate for a stripped EG/EK swap chassis, unverified; no manufacturer figure applies to a swap · 12.2 lb/hp
rotating assembly ceiling · fails first: stock sleeves under big boost · 93 AKI · no named source: site planning estimate · site planning figure ~500 hp; the community figure of ~450 hp on stock sleeves was not found on a fetched page
Induction ceiling~285 hp
naturally aspirated ceiling (bolt-ons and cam) · fails first: NA ceiling: intake manifold, header, cams · 93 AKI · no named source: site planning estimate · site planning figure ~285 hp
Fuel system~280 hp
stock fuel-system ceiling · fails first: swap-dependent fuel system · 93 AKI · no named source: site planning estimate · site planning figure; no named source in this audit
Clutch (manual)~260 hp
stock clutch torque capacity · fails first: swap clutch slip · no named source: site planning estimate · site planning figure; no named source in this audit
Transmission (automatic)~300 hp
gearbox / driveline rating · fails first: K-series 6MT at torque · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~320 hp
thermal ceiling for sustained load · fails first: swap cooling packaging · no named source: site planning estimate · site planning figure; no named source in this audit
Tuning limitsenthusiast estimates, crank hp on the stated fuel; sources: none named yet; method: the analyzer plans on the lower bound of each range
⚑Stock-sleeve K24s are commonly reported near 450 hp with a good tune (community consensus); the block is rarely the problem, the budget tune is.
⚑Swap-car rule: mounts, wiring, cooling and brakes done properly before power. The fast ones are the finished ones.
04 The typical path
Intake → headers → tune → cams or forced induction. NA gains are modest on most platforms; the big unlock is boost, and boost starts at the fuel system.
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