K20A in Honda Civic EG – swap guide

Swap overview with verified parts, part numbers and sources.

Researched

July 31, 2026

Internal confidence

K20A in Honda Civic EG.

Documented from 33 recorded sources: 8 of the ten mandatory blocks are carried by two independent publishers, 1 does not apply. Internal confidence 73%.

Engine

Engine basics

Water-cooled transverse inline-four, aluminium-family construction, chain-driven DOHC i-VTEC and electronic fuel injection. The cited Type R K20A is 1,998 cc with an 86.0 x 86.0 mm bore/stroke; the cited Accord K24A is 2,354 cc with 87 x 99 mm. Output, compression, VTEC strategy, throttle control, intake, exhaust, oil pump and ECU differ by suffix, donor and market, so no single power figure is valid for the full manifest scope.

Status: SUPPORTED · Confidence 80%

Aspiration

Naturally aspirated gasoline baseline. The cited OEM K20A, K20Z3 donor and K24A configurations are non-turbo; aftermarket turbo or supercharged builds are outside this record and require separate fuel, charge-air, cooling, brake, drivetrain and appro

Recommended donor engine

Prefer a complete, running, emissions-documented front-wheel-drive donor package. Directly documented examples include a DC5/EP3 Type R K20A with six-speed, a 2006-2011 Civic Si K20Z3 package, or an Accord/TSX-family K24A with its exact ancillaries. A matched engine, manual transmission, intermediate shaft, engine harness, ECU, key/immobilizer solution, sensors, pedal or throttle hardware and emissions parts is safer than mixing loose K-family components.

Donor parts recommendation

Buy and label a complete matched set: long block with intake/throttle, exhaust and oiling hardware; manual transaxle, clutch/flywheel, starter and intermediate shaft; engine/charging harnesses, ECU, key/immobilizer or supported ECU solution, sensors, oxygen sensors, pedal where required, alternator and fuse hardware. Add one coherent EG system for mounts, axles, shifter/cables, conversion harness, fuel, cooling, header/catalyst and power-steering/A/C decisions. Record donor VIN, engine and gearbox stamps and emissions documentation before dismantling.

Status: SUPPORTED · Confidence 84%

1 · Engine mounts

VERIFIED

Use a 1992-1995 EG K-swap mount system selected for the exact manual transmission family and desired engine height. Hasport documents separate RSX/Civic-Si, Accord/TSX, later Accord/TSX/Civic-Si and CR-V/Element manual-transmission routes, a dual-height position, and removal of the stock transmission bracket from the frame rail. Mock up the complete engine, gearbox, intake, header, steering and bonnet before final cutting or welding; do not combine mount brackets from different systems.

2 · Oil pan and steering

VERIFIED

Treat oil pan, oil pump, pickup, windage hardware and engine height as one package. A K-swapped EG can place the sump lower than the original drivetrain; a documented EG build reports inadequate ground clearance. K-Tuned's steel-pan path fits only listed K20A/K20Z1/K24A variants, excludes a K20Z3 with its stock oil pump, and requires an oil-pump change on balance-shaft engines. Verify pickup-to-pan clearance, sealing hardware, subframe/header clearance, oil pressure and road-legal ground clearance for the exact engine.

3 · Manual gearbox

SINGLE_SOURCE

Gearbox

Documented routes include RSX/early Civic Si, Accord/TSX, later Accord/TSX/Civic Si and CR-V/Element K-series manual transaxles, each requiring its matching mount variant and shifter solution. Direct EG builds demonstrate both K20Z3 and K20A/K24-family six-speed paths. Select by exact gearbox code, ratios, final drive/LSD, casing, speed sensor, clutch input, intermediate shaft and ECU needs; a gearbox that bolts to the block is not automatically compatible with the chosen mounts or cables.

Gearbox mount

Use the rear/transmission mount bracket supplied for the exact EG mount system and gearbox family. The documented EG system requires removing the stock frame-rail transmission bracket and provides different manual-transmission variants plus two engine heights. Establish mount height, axle angle, bonnet and sump clearance before final welding; torque only from the current mount instructions and inspect the rail and welds after initial running.

Status: VERIFIED · Confidence 86%

Shifter and linkage

(1Q) Use a shifter box, mounting plate and cables matched to the chosen transaxle. The documented DC5 plate fits the EG tunnel but requires two holes and does not interchange with the TSX plate; the original EG rod linkage is not reused. Seal the tunnel against exhaust fumes and verify cable bracket, cable travel, reverse selection, console/seat clearance and service access before final assembly.

Status: SINGLE_SOURCE · Confidence 55%

Clutch

Specify flywheel, clutch, release bearing, fork/slave cylinder, starter and gearbox input as one matched set. The direct EG guide requires a custom hydraulic clutch line; the parts list uses an RSX-family clutch/flywheel only for its documented gearbox, and a K24A2/K20Z3 EG build uses another matched aftermarket set. Verify crank/flywheel pattern, disc spline, release travel, master/slave sizing, line routing and torque capacity; no single clutch fits every K20A/K20Z/K24A transmission path.

Status: SUPPORTED · Confidence 78%