CRX Si with DOHC ZC Swap? What is the DOHC ZC?
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From: Moline IL
CRX Si with DOHC ZC Swap? What is the DOHC ZC?
I'm going to look at buying this CRX Si today that has a DOHC ZC swap in it. I know I've heard of these, but why can't I find ANY info on this motor online?
Isn't it the japanese version or something? I basically just want to know what this came in originally, and perhaps some stock specs on it so i know what is under the hood.
Anything I should look for while I'm checking it out to make sure it's legit?
Really apreciate it, if all checks out well I'll be driving it home in about two hours.
Isn't it the japanese version or something? I basically just want to know what this came in originally, and perhaps some stock specs on it so i know what is under the hood.
Anything I should look for while I'm checking it out to make sure it's legit?
Really apreciate it, if all checks out well I'll be driving it home in about two hours.
Crazy Honda Guy
Joined: Sep 2003
Posts: 8,025
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From: Calgary, AB, Canada
Re: CRX Si with DOHC ZC Swap? What is the DOHC ZC?
The dohc zc is a decent engine, and makes 130hp..i did a swap like that about 15 years ago. The biggest advantage to it, is the added tq. The biggest disadvantage, is that they often burn oil, mostly because of the age of them these days 
Congrats on your new ride!
Congrats on your new ride!
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Re: CRX Si with DOHC ZC Swap? What is the DOHC ZC?
the DOHC ZC is a dead drop into 88-91 civics any chassis. in terms of engine mounts. for anything other than the SI's wiring for MPFI and the 88-89 Integra ECU is required to run these Engines. in the US this engine is equivelant to the 86-89 Integra there is only 1 major difference that the driver side engine mount for the USDM Integra D16a1 is located on the radiator support. so you can swap a D16a1 into a EF but requires fabrication of a Custom mount bracket. also to note the Tranny bolt pattern does not lign up with any other D Series Engine. the JDM DOHC ZC series runs to the end of the OBD1 "96" but may continue into OBD2 this im not entirely sure. these engines are incredible engines and if you can find you props. they are great for boost as well.
Re: CRX Si with DOHC ZC Swap? What is the DOHC ZC?
The JDM DOHC ZC is like the D16A6, A8 and A9. I was looking into these when I was doing my motor swap. Very easy to bolt in. However, the parts are not very common. It's a DOHC non-VTEC also. I'd say that a B18A/B swap would net you similar performance (or better) and be way easier to repair.
Somehow I doubt you looked very hard online to find information on this motor. This is on the Wiki page...
DOHC ZC[edit]
Non-VTEC
Found in (JDM) 1984–1987 Honda Ballade CRX AS
1984–1987 Honda Civic AT
1985–1987 Honda Integra AV/DA1 (Lower trim packages equipped with Single Carburetor)
1986–1991 Honda CRX EF7
1992–1995 Honda Civic EH1 Displacement : 1,590 cc
Bore and Stroke : 75 mm X 90 mm
1984–1987 Compression : 9.3:1 1988–1989 Compression : 9.5: 1
Single Carburetor : 100 PS (73.5 kW) at 6,800 rpm; Torque : 92 lb·ft (12.8 kg/m, 126 Nm) at 5,500 rpm
1984–1987 Power : 115 PS (85 kW) at 6,250 rpm; Torque : 99 lb·ft (13.7 kg/m, 134 Nm) at 5,500 rpm
1988–1989 Power : 120 PS (88 kW) at 6,500 rpm; Torque : 103 lb·ft (14.0 kg/m, 137 Nm) at 5,500 rpm
1988–1991 Power : 130 PS (96 kW) at 6,800 rpm; Torque : 106 lb·ft (14.7 kg/m, 144 Nm) at 5,700 rpm
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 125 PS (92 kW) version of the D16A1. These were later replaced by the D16A8 or B16A, depending on the specs.
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 twenty years old and getting harder to find. D-series version is called D16A1, 1986-1987.
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" this appeared in the JDM EF3 Civic and EF7 CR-X, and also in the JDM Honda Quint Integra GSi (DA1 chassis). This is the 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) (sometimes +7cc P29 pistons)
Non-VTEC
Found in (JDM) 1984–1987 Honda Ballade CRX AS
1984–1987 Honda Civic AT
1985–1987 Honda Integra AV/DA1 (Lower trim packages equipped with Single Carburetor)
1986–1991 Honda CRX EF7
1992–1995 Honda Civic EH1 Displacement : 1,590 cc
Bore and Stroke : 75 mm X 90 mm
1984–1987 Compression : 9.3:1 1988–1989 Compression : 9.5: 1
Single Carburetor : 100 PS (73.5 kW) at 6,800 rpm; Torque : 92 lb·ft (12.8 kg/m, 126 Nm) at 5,500 rpm
1984–1987 Power : 115 PS (85 kW) at 6,250 rpm; Torque : 99 lb·ft (13.7 kg/m, 134 Nm) at 5,500 rpm
1988–1989 Power : 120 PS (88 kW) at 6,500 rpm; Torque : 103 lb·ft (14.0 kg/m, 137 Nm) at 5,500 rpm
1988–1991 Power : 130 PS (96 kW) at 6,800 rpm; Torque : 106 lb·ft (14.7 kg/m, 144 Nm) at 5,700 rpm
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 125 PS (92 kW) version of the D16A1. These were later replaced by the D16A8 or B16A, depending on the specs.
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 twenty years old and getting harder to find. D-series version is called D16A1, 1986-1987.
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" this appeared in the JDM EF3 Civic and EF7 CR-X, and also in the JDM Honda Quint Integra GSi (DA1 chassis). This is the 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) (sometimes +7cc P29 pistons)
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