K20A2 engine and 6-speed transmission
into Civic EF (from RSX Type-S)

DC5 RSX Type-S 2002-2004
→
EF Civic EF 1988-1991

Yes: the K20A2 engine and 6-speed transmission from the RSX Type-S (2002-2004) fits the Civic EF (1988-1991) — difficult difficulty, modifications required.

Verdict
Fits.
Verified entry · modifications required
Verified ✓
Difficulty
Difficult
Mods
Required
Category
Engine

Installation notes

Yes — the K20A2 engine and 6-speed transmission from a 2002-2004 RSX Type-S (DC5) fits a 1988-1991 Civic (EF) with an EF K-series mount kit, K-swap radius rods, swap axles and a cable-to-hydraulic clutch conversion. Innovative states that modification to the rear subframe and hood is necessary and that its kit does not fit K24 transmissions. Hasport sells EFK2, EFK4 and EFK5 versions for different K-series transmissions. The same parts are listed for the 1988-1991 CRX.
ModsMods req.

Required modifications

Engine mounts: Hasport EFK2 (RSX and 02-11 Civic Si manual transmissions; Hasport says the EFK kits require cutting and welding, and a K20 fits under the stock hood on the lower mount setting) or Innovative 99150 (02-05 Civic Si, 02-06 RSX or Integra Type R manual transmissions; its self-locating bracket must be welded to the frame and the rear subframe and hood need modification). Radius rods: Hasport EFKROD clears the wider K-series block while keeping the factory front crossmember. Clutch: the EF has a cable clutch and the K-series gearbox is hydraulic, so a cable-to-hydraulic conversion or hydraulic pedal setup is needed. Axles: K-swap axles for 88-91 Civic/CRX with the RSX/EP3 intermediate shaft (Hasport HP-EFKAX). Plus wiring/ECU, shifter cables, cooling, fuel and exhaust.

Caution

Important caveats

  • Both kits involve welding: Hasport says its EFK kits require cutting and welding, and Innovative says its EF K kit requires welding a bracket to the frame plus rear subframe and hood modifications.
  • A K24 block needs Honda post-mount bracket 11910-PPA-000 with the Innovative kit, and the kit does not fit K24 transmissions.
  • The EF chassis has a cable clutch, so the hydraulic K-series transmission needs a clutch conversion.
  • Hasport lists its EF K-swap axle set for the RSX/EP3 manual intermediate shaft.

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Reference

K20A specs → K24A specs → D14A1 specs → K20Z4 specs → LEB-H5 specs → K24A3 specs → K20Z2 specs → B18A1 specs → K24A8 specs → K24A4 specs → K24W1 specs → K20C1 specs → K20Z3 specs → K24Z7 specs → K24Z3 specs → K24Z2 specs → K24A2 specs → K24A1 specs → K20A3 specs → D16A6 specs → B18B1 specs → K20Z1 specs → K20A2 specs → B18C2 specs → B18C7 specs → D16A8 specs → D16W4 specs → EA specs → EC specs → ED specs → EE specs → EF specs → EL specs → EN specs → ER specs → ES specs → K20A1 specs → K20A4 specs → K20A6 specs → K20A7 specs → K20A9 specs → K20B specs → K20Z5 specs → K24V5 specs → K24V7 specs → K24W specs → K24W4 specs → K24W7 specs → K24W9 specs → K24Y1 specs → K24Y2 specs → K24Z1 specs → K24Z4 specs → K24Z5 specs → K24Z6 specs → PRB-A00 Cylinder Head →

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Sources

4 refs
  1. 01 https://hasportperformance.com/products/efk/
  2. 02 https://innovativemounts.com/products/88-91-civic-crx-conversion-mount-kit-k-series-hydro-manual-auto-2-manual
  3. 03 https://www.hybrid-racing.com/products/hasport-efkrod-k-swap-radius-rod-88-91-civic-crx
  4. 04 https://hasportperformance.com/products/hp-efkax/
Submitted by FitMyBuild research Added Updated

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