I want to swap a 1999 OBDII B20Z into a 1993 OBDI Civic Si. I would appreciate any help, especially if it is from someone who has swapped an OBDII non-vtec engine into an OBDI vtec car.

What I have:
-B20Z longblock

What I need: (I think)
-OBDI integra LS wiring harness
-OBDI integra LS ECU
-OBDI integra LS intake manifold, including fuel rail and injectors
-OBDI integra LS alternator

What I am confused about:
-Do I NEED to get an OBDI LS alternator?
-Do I need to swap the plug that comes out of the base of the distributor on the B20 with the plug from an OBDI integra LS?
-Does the OBDI LS engine have a knock sensor? If not, will the knock sensor on my B20Z be used?
-Can I use the injectors, fuel rail, and throttle body from the B20Z?

 

Wow, no one here has done this swap or even knows how? What happened to this board? It used to be so great. Oh well. I guess everyone really is at honda-tech.

 

PM/e-mail PinoyShadow. He has a B18B in his 93 Si hatchback.

Honda-tech is only temporary...

 

Use your stock harness and either a 94-95 LS ECU or a 92-95 DX ECU.

-Do I NEED to get an OBDI LS alternator? Yes, any OBD1 B-series will work, if you don't have this, you can rig up a d-series to work, only the bottom will bolt in, the tension from the belt will keep it from moving
-Do I need to swap the plug that comes out of the base of the distributor on the B20 with the plug from an OBDI integra LS? will not plug in, use an OBD1 b18b dist unless you want to swap plugs
-Does the OBDI LS engine have a knock sensor? If not, will the knock sensor on my B20Z be used?no knock sensor on the b18b, LS nor DX ECU won't look for a KS
-Can I use the injectors, fuel rail, and throttle body from the B20Z? plugs *may* be different, not sure....I think it's the injector plugs that are different

 

Thank you very much madtownhonda. I'm glad I'm finally getting answers to my questions. The guys at honda-tech were not much help. And yes dom93hatch, I hope you are correct. Maybe someday everyone will come back to h-a net. I do have a couple more questions though.

You said use my stock harness. Do you mean the wiring harness from my D16Z6? And if I chose to use an OBD1 LS wiring harness, would that work as well? The reason that I am asking is because I was going to sell my D16 as a complete swap, including wiring harness. If I can use an OBD1 LS harness I would rather do that.

I need to use an OBD1 B18B distributor on the B20Z unless I want to swap plugs... what do you mean swap plugs?

 

The obd1 distributor has 2 plugs, the obd2 distributor has 1 plug. If you want to use the LS wiring harness, you can. You can also use your stock one. If you don't already have an LS harness, I would recommend that you just use your stock one. Either way, the LS ecu will plug in. Or if you choose, you can also use a 92-95 DX ecu and it will work just as well. Your going to spend more money on an LS harness than what you would lose if you charged somebody less for a swap w/o stock wiring harness. I'm not sure if the b20z has the same IM as the b18b. If it doesn't, then I suggest you get an OBDI b18b IM, TB, and injectors. The obd2 injectors have different plugs than the obd1 counterparts. The actual mechanisms are the same, but the plugs are just different. So you have 2 choices: 1. swap the injectors or 2. swap the plugs.

I have never physically done a 5th gen swap, only 6th gen. I will be tackling that soon though. I'm putting my old OBD2 d16y8 into my 92 CX hatch. I am using the stock harness, obd1 injectors, and obd1 distributor, and a p28 ECU.