JDM K20A (Type R) engine
into Civic Si (from Civic Type R)

EP3 Civic Type R 2001-2005
→
EP3 Civic Si 2002-2005

Yes: the JDM K20A (Type R) engine from the Civic Type R (2001-2005) fits the Civic Si (2002-2005) — moderate difficulty, modifications required.

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

Installation notes

Yes — the JDM K20A from a 2001-2005 Honda Civic Type R (EP3) fits a 2002-2005 Honda Civic Si (EP3) without mount changes, using a manual KPro ECU and a 02-04 style engine harness. The US EP3 Si came with the 160 hp K20A3, while Wikipedia lists the JDM Civic Type R K20A at about 158 kW (212 hp) at 8,000 rpm. Hondata confirms KPro supports both the US Civic Si ECU and the Japanese Civic Type R ECU. Wiring and ECU choice are the main jobs; the engine itself drops into the same chassis.
ModsMods req.

Required modifications

Mounts: none — the JDM Civic Type R used the same EP3 body as the US Civic Si. ECU: Hondata KPro supports the 2002-2005 Civic Si (PNF) ECU and the 2003-2004 Japanese Civic Type R (PRD) ECU; Hondata's admin states an EP3 must use a manual (not automatic) ECU with KPro. Harness: use a 02-04 style engine harness (Hondata states engine swaps must use a 02-04 engine harness and transmission); the JDM K20A harness is RHD-length. Transmission: the US Si 5-speed can stay, or fit a 6-speed with matching ECU/harness for the reverse lockout.

Caution

Important caveats

  • Hondata lists the Japanese Civic Type R ECU for 2003-2004, while Wikipedia lists JDM Civic Type R K20A production as 2001-2006; check the donor's exact year and ECU code.
  • Hondata's forum admin says an EP3 should not use an automatic ECU with KPro.
  • JDM K20A harnesses are RHD-length and lack the oil pressure switch connector, per Hybrid Racing.
  • The EDM Civic Type R uses a different K20A2 (200 hp) rather than the JDM K20A; confirm which engine you are buying.

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Reference

B16A specs → B18C specs → F20C specs → H22A specs → K20A specs → K24A specs → C20AT specs → D14A1 specs → D17A specs → K20Z4 specs → LEB-H5 specs → R20A6 specs → R18Z6 specs → B18A specs → D15A1 specs → EW5 specs → J25A specs → B20B specs → K20Z2 specs → B18C-00-Spec-R specs → B18B specs → B18C-96-Spec-R specs → B18C-98-Spec-R specs → B18C-SiR-G specs → K20A-RAA specs → K24A-RBB specs → C32B specs → C30A specs → L15ZF specs → L15BU specs → L13B specs → ZC SOHC specs → ZC SOHC Carb specs → ZC DOHC Gen2 specs → ZC SOHC VTEC specs → B16A SiRII specs → F18B specs → F20B-CF4 specs → F20B specs → K20Z3 specs → K24Z7 specs → K20A3 specs → D16A6 specs → ZC DOHC specs → K20Z1 specs → K20A2 specs → D16Z6 specs → D16W4 specs → EC specs → ED specs → EL specs → EN specs → EP specs → ES specs → K20A1 specs → K20A4 specs → K20A6 specs → K20A7 specs → K20A9 specs → K20B specs → K20Z5 specs → PNL Cylinder Head → RNE ECU → RPM ECU →

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Sources

4 refs
  1. 01 https://www.hondata.com/kpro
  2. 02 https://hondata.mobi/forum/viewtopic.php?p=130311
  3. 03 https://en.wikipedia.org/wiki/Honda_K_engine
  4. 04 https://guides.hybrid-racing.com/Item/Engine_Harness_Selection
Submitted by FitMyBuild research Added Updated

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