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There are alot of different motor swaps for these cars. Before you choose which one you have to think of 2 things, your skills and your money. Skill wise it goes D to B to H to K to J. The last time I wrote this there were 3 main types, The D, B, and H series. Now K is the new B and J's are making their way into the scene due to mount kits being made available by companies like Hasport.

D-Series
The D-series swap is the easiest and cheapest swap in a 4g Civic. They bolt right in and their cheap. There's no need for new axles or mounts but if you don't have an Si a DPFI to MPFI swap is needed unless you keep your stock intake manifold and distributor. It is a very popular swap to put a Z6 or Y8 Vtec head on a D15 or D16 block. Your car had a d series from the factory so you can use all of your stock components. The L3 tranny out of the 4g Si or off the DOHC ZC are what your going to want to use.

B-Series
B-series motors are probably the most popular. Go in pretty easy and their not a slow motor stock. The cable tranys available are S1, A1, Y1, and the YS1. The Y1 is optional LSD and the YS1 is LSD. The S1 and A1 are out of 90-91 Integras, the Y1 is the JDM B16 tranny, and the YS1 is a GsR tranny. You'll need motor mounts. Hasport is definately the best but there are other companies one being HCP. Then your going to need shift linkage. There is adjustable linkage available through Hasport. There is also a company named Avid or you can shorthen 90-93 Integra linkage. The stock throttle cable doesn't work so you'll need it off of a 90-93 Integra. The axles from a 90-93 Integra or custom axles must be used. Dx or Si hubs need to be used. The dust rings also need to be taken off of the knuckles. Also a 90-93 Integra intermediate shaft needs to be sourced to go along with the axles. A large dent must be made in the frame rail, right below the strut tower, for alternator clearance. Last the stock exhaust manifold won't match up. You can either get a cat with adjustable flange, get a custom exhaust, or use your d series downpipe with the b series cast manifold.Vtec needs to be wired in if using a vtec motor.
  • A8 Vtec solenoid
  • B5 Vtec oil pressure switch
  • B19 Knock sensor
  • C8 2nd O2 sensor
H-Series
H-series motors require alot of work to get them in and almost require an upgraded suspension because of the increase in weight. This is a pretty expensive swap and definately the most complicated of the b, d, and h series. And in my opinion a waste of time. It throws off the geometry of the car due to the extra weight and the mounts and axles are stupid expensive.

B series Vtec Motors
Motor - Vehicle
Tranny
Hp - Torque
CR
ECU
OBD_
89-91 JDM B16a - 89-91 Civic & CRX SiR 90-91 Integra XSi
JDM S1 J1 Y1 A1 (cable)
158 hp@7600 112lb-ft@7000
10.4:1
Pr3
OBD0
92 + JDM B16a - 92-95 Civic Sir
Y21 S4c (hydraulic)
168hp@7800 116lb-ft@7300
10.4:1
P30
OBD1
97+ JDM B16b - Civic Type R
S80 w/ LSD (hydraulic)
185hp@8200 118lb-ft@7500
10.8:1
PCT
OBD2
95+ JDM B18c-R - 95+ Integra Type R
S80 w/LSD (hydraulic)
200hp@8000 135lb-ft@7500
11.0:1
P73
OBD2
96+ JDM B18c
Y80 S80 (hydraulic - optional LSD)
180hp@7600 129lb-ft@6200
10.6:1
P72
OBD2
93-95 USDM B16a2 - 94-95 Del Sol
Y21 (hydraulic
160hp@7600 112lb-ft@7000
10.2:1
P30
OBD1
96-97 99-00 USDM B16a3 - 96-97 Del Sol 99-00 Civic Si
S4C (hydraulic)
160hp@7600 112lb-ft@7000
10.2:1
P2tT
OBD2
92-93 USDM B17a1 - 92-93 Integra GsR
YS1 (cable)
160hp@7600 118lb-ft@7000
9.7:1
P61
OBD1
94-95 B18c1 - 94-95 Integra GsR
Y80 (hydraulic)
170 hp@7600 128lb-ft@6200
10.0:1
P72
OBD1
96+ USDM B18c1 - 96-01 Integra GsR
Y80 (hydraulic
170hp@7600 128lb-ft@6200
10.0:1
P72
OBD2
97+USDM B17c5 - 97 + Integra GsR
S80 w/ LSD (hydraulic)
195hp@8000 130lb-ft@7500
10.6:1
P73
OBD3
B series non Vtec Motors
Motor - Vehicle
Tranny
Hp Torque
CR
ECU
OBD_
90-91 USDM B18a1 - 90-91 Integra
S1 Y1 A1 (cable)
130hp@6000 121lb-ft@5000
9.2:1
PR4
OBD0
92-93 USDM B18a1 - 92-93 Integra
YS1? (cable)
140hp@6300 126lb-ft@5000
9.2:1
OBD1 PR4
OBD1
94+ USDM B18b1 - 94+ Integra
S80 (hydraulic)
142hp@6300 127lb-ft@5200
9.2:1
P75
OBD1-2
96-98 B20b/B20z
?
126hp@5400 133lb-ft@4300
8.8:1
?
OBD2
99-00 B20b/B20z - 99-00 CRV
?
146hp@6200 133lb-ft@4500
9.6:1
?
OBD2
D series
Motor - Vehicle
Tranny
Hp Torque
CR
ECU
OBD_
88-91 USDM D16a6 - 89-91 civic Si *8-91 CRX Si 90-91 Civic Ex
Si L3 (cable)
108hp@6000 100lb-ft@5000
9.1:1
PM6
OBD0
88-91 D16a8/a9 - 88-91 Civic & CRX 16/1.6i
L3 (cable)
137hp@6800 108lb-ft@5700
9.3:1
PM7
OBD0
92-95 USDM D16z6 - 92-95 Civic Si and Ex
? (hydraulic)
125hp@6600 106lb-ft@5200
9.2:1
P28
OBD1
96-00 USDM D16y8 - 96-00 Civic Ex
? (hydraulic)
127hp@6600 107lb-ft@5500
9.6:1
P2P
OBD2