D16Z6 SOHC VTEC engine and hydraulic transmission
into Civic EF (from Civic Si)

EG Civic Si 1992-1995
→
EF Civic EF 1988-1991

Yes: the D16Z6 SOHC VTEC engine and hydraulic transmission from the Civic Si (1992-1995) fits the Civic EF (1988-1991) — moderate difficulty, modifications required.

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

Installation notes

Yes — the D16Z6 SOHC VTEC engine from a 1992-1995 Civic Si (EG) fits a 1988-1991 Civic (EF) with EF mounts for the 92+ D-series, a clutch solution for the hydraulic transmission and OBD0-to-OBD1 wiring work. Hasport says its EFDHC kit works with 92-00 Civic D-series hydraulic transmissions and lets the EF clutch cable operate them. Innovative sells a mount kit for 92+ D-series engines in the 88-91 Civic/CRX with a hydraulic transmission. The D16Z6 was rated at 125 hp and was also used in the 1992-1995 Civic EX and 1993-1995 del Sol Si.
ModsMods req.

Required modifications

Engine mounts: Hasport EFD2 (the 92-95 Civic D-series 2-bolt block bracket version of the EFSTK kit) or Innovative 49152 (88-91 Civic/CRX with 92+ D-series engines, manual hydraulic transmission or cable-to-hydraulic conversion). Clutch: to run the 92-95 hydraulic transmission, add Hasport EFDHC (rear bracket, transmission bracket and lever assembly so the EF clutch cable operates the hydraulic gearbox) or use the actuator offered with the Innovative kit. Innovative says the original timing-belt post mount is required. Also wiring/ECU for the OBD1 VTEC engine in the OBD0 EF chassis, axles and shift linkage.

Caution

Important caveats

  • The EF is an OBD0 chassis and the D16Z6 is OBD1, so the engine harness and ECU need conversion.
  • Innovative says pre-1992 D-series engines use a different driver-side mount and a different kit (49151).
  • Hasport notes its EF stock-replacement kit is not for the AWD Civic wagon.
  • This entry covers the complete D16Z6 engine and transmission, not head-only "mini-me" style conversions.

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Reference

D14A1 specs → LEB-H5 specs → D17A2 specs → B18A1 specs → D16A6 specs → B18B1 specs → D16Z6 specs → B18C2 specs → B18C7 specs → D16A8 specs → D16W4 specs → EC specs → ED specs → EF specs → EG specs → EL specs → EM specs → EN specs → ER specs → ES specs → ET specs → S20 Hatchback/del Sol Transmission (EH2 , EG1) → P08 Cylinder Head →

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Sources

4 refs
  1. 01 https://hasportperformance.com/products/efstk/
  2. 02 https://hasportperformance.com/products/efdhc/
  3. 03 https://innovativemounts.com/products/88-91-civic-crx-conversion-engine-mount-kit-d-series-92-engines-cable-2-hydro-manual
  4. 04 https://en.wikipedia.org/wiki/Honda_D_engine
Submitted by FitMyBuild research Added Updated

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