Hi, my 1990 Civic Hatchback DX MT currently has it's stock motor (North American).

I'm here to find out if ordering a DOHC ZC JDM engine will be the right choice. I need to know if everything will fit and what changes will have to be made (if there are any...). Here is the list of all the parts included:

Motor, Transmission, Distributor, Intake Manifold, Exhaust Manifold, Alternator, A/C, Power Steering Pump, Starter & Sensors.

The ZC engine I am looking at is from 89-91 therefore it's coming from a JDM spec CR-X am I right ? 1.6L DOHC Bore 75 Stroke 90 1590cc ~130hp @ 6800 and 106tq@ 5700


Thanks a bunch from your help guys. Looking forward to your recommendations and inputs on this swap.


Btw, I've found this info in another thread, add or comment on it if you want :
The ZC will bolt right in to the 88-91 CRX/CIVIC no fabricating or welding is needed
The swap can use your existing wiring harness if you have an SI, if you have a DX then minor modification is necessary.You can use the SI or DX transmissions, they both bolt up. You can also use the SI or DX flywheel.

The engine only adds about twenty-five pounds to the front of the car, so your steering and suspension should be the same. If you are still concerned about the added weight, move your battery to your trunk.

should bolt right up

yes everything should pretty much bolt up...

Got this from wikipedia, FYI:
DOHC ZC

Found in 1986-1991 (JDM) Civic and CR-X
Specs:
Displacement : 1590 cm³
Bore and Stroke : 75 mm X 90 mm
1986-1987 Compression : 9.3:1 1988-1989 Compression : 9.5: 1
1986-1987 Power : 113 hp (84.3 kW, 115 ps) @ 6250 rpm; Torque : 99 ft·lbf (13.7 kg/m, 134 Nm) @ 5500rpm (US)
1988-1989 Power : 118 hp (88.0 kW, 120 ps) @ 6500 rpm; Torque : 103 ft·lbf (14.0 kg/m, 137 Nm) @ 5500rpm (US)
1988-1991 Power : 130 hp (96.9 kW, 132 ps) @ 6800 rpm; Torque : 106 ft·lbf (14.7 kg/m, 144 Nm) @ 5700 (JDM)
Valvetrain : DOHC
Piston Code 1986-'87 : PG6
Piston Code 1988-'89 : PM7
Fuel Control : OBD-0 MPFI

Euro Mk1 ('85-'87) 1.6 CRX's are fitted with an engine designated "ZC1" which is a higher spec 130 hp (96.9 kW, 132 ps) version of the D16A1. Which were later to be switched out with the D16A8 or B16A depending on which model.

1st Gen ZC Identified by: External coil, small distributor, dual butterfly TB, cam cover bolts on top, brown/gold cam cover. Large cam pulleys. +3cc PG6B pistons, non-pent roof combustion chamber. As a ZC it appeared in JDM AV Integra Si and JDM E-AT Civic/CR-X Si. Commonly produced at the time but now over 20 years old and getting harder to find. D-series version D16A1 '86-'87

2nd Gen ZC (rarest) Identified by: Internal coil, large distributor, single butterfly TB mounted on slight angle forward, bolts on top of cam cover, black cam cover, large cam pulleys. +7cc PM7 pistons, 43 cc Pent roof combustion chamber. As a ZC appeared in JDM facelift AV bodied Integra Si did not appear in Civic or CR-X, rarest ZC only produced for less than one year. D-series version D16A1 '88-'89 (sometimes +7cc P29 pistons)

3rd Gen ZC Identified by: Internal coil, large distributor, single butterfly TB. Black cam cover. Cam cover bolts on the sides. Small cam pulleys. Inlet Manifold stamped PM7. +7cc PM7 pistons, 43 cc Pent roof combustion chamber. As a ZC appeared in JDM EF3 civic and EF7 CR-X, did not appear in an Integra body. Most commonly produced ZC, manufactured in Japan from end of '87 through to early '91 D-series version D16A8/9 (Euro Civic Si) (sometimes +7cc P29 pistons)

4th Gen ZC Identified by: Internal coil. OBD1 EFi system (grey plug). No cam angle sensor on exhaust cam, now located in distributor. Rubber plug where cam angle sensor would mount. Black cam cover. No PGM-EFi plate on the inlet manifold, replaced with three ribs instead. P29 stamped on inlet manifold. MAP sensor on TB. +7cc PM7 pistons, pent roof combustion chamber. As a ZC only appeared in EG5 Civic bodies, no Integra or CRX received this engine. Reasonably common produced from '92 to '94. (20th Anniversary edition & Japanese car of the year) D-series version D16A8/9 (Euro & Australia Civic Si & NZ Civic Gti) (sometimes +7cc P29 pistons)

Thanks guys, I am getting the engine and parts from JDM engine import.

http://www.jdmengineimport.com/engineInfo.php?link=38

Looks like I'm getting a 3rd Gen ZC. I should probably swap in the JDM transmission with it and keep my original for backup. Got my 2nd gear synchro replaced after she was popping out of gear repetitively. Plus, I hear the JDM trans has shorter ratio's.

Oh, something else I'd like to know. What kind of minor modification is necessary to the wiring harness since I have a DX ?? Thanks