My friend has a 91 hatch and wants to put a d15b7 into it(froma93civicEG). would it drop in without any problems. Im asking because the harnesses are not similar. therefore I assume Id need to swap harnesses over as well. some one help me. if I swap the harnesses over will the harness plug into the EF computer. Or would I need to use the EG computer. BTW the EG is an automatic and the EF isnt. Im not sure if the trannys are commputer controlled or not. thanks

 

the tranies will not swap out, the motors will. use ur EF harrness and computer, as well as injectors and dizzy. It should work without any problems

 

Sorry to bring back a dead thread, but I have a question!

If I had the d15b7 motor, intake and throttle body, harness, and ecu, can I just bolt on my ef si trans and swap all that stuff over to my ef hatch without really doing anything else?

I have a 89 dx hatch that has a dying motor. I have access to the b7 motor with intake, fuel rail, ecu, harness. I just want the easiest thing right now. Can't it all just go on the ef chassis with an ef trans?

 

Your 89 DX is going to be obd-0 and that D15B7 is going to be an obd-1 motor. Some wiring will be involved in getting the B7 to run correctly. I would contact Ryan from Rywire to purchase an obd-0 to obd-1 jumper harness.

 

you can use the b7 engine (long block) and re-use your factory tranny, intake and exhaust manifold. Re-use most of the 89 dx stuff to keep it OBD0.

 

What would I have to rewire and why would I need an obd0 - 1 jumper if I'm using the b7 ecu, harness, intake, and exhaust?

I just want to keep it as simple as possible. If I can just tear all the b2 stuff out(engine, harness, intake, exhaust) and throw in all the b7 counterparts, that seems pretty simple.

Please correct me if I'm oversimplifying things.

 

CIVIC 91 DX= D15B2
CIVIC 91 SI= D15B7
No problem dude...just somo changes, like computer and arness...

 

Isn't si a d16??

 

Gotta know if I should buy the motor...

 

yes buy the d15b7 motor
use your stock engine mounts
use your tranny
use your ecu
use your intake mainifold
use your dizzy
the only thing you have to rewire is your rad fan switch because efs have it on the block and egs have it on the thormostat housing
it well work just fine ^_-

 

thank you very much, I'll give it a try

 

by the way... will a d15 with no trans fit in a hatch? I mean fit in the back of a hatch. what's the best way to transport the thing?? definately tarp the inside, maybe set the motor on an old tire, strap it to the two lock-down things on the sides for the rear seats?

 

that would work, or pull out your passenger seat and set it in there.

as far as why buy a jumper harness, obd1 cars are wired different from obd0. plus you'd have to convert to mpfi to go obd1

 

But if I got rid of all the dpfi stuff and d15b2 stuff and replaced it with the entire b7 engine with the b7 harness and the b7 intake, fuel rail, injectors, throttle body, exhaust, and ecu, wouldn't that be OBD1 and mpfi(add the little resistor box or whatever it's called) since everything in the engine bay including ecu is from the b7?

 

The way the OBD1 connectors are shaped is different from those of the odb0 chassis. As well as the pin locations, Shock tower to shock tower differences. So while you could theoretically deconstruct the obd1 harness and refit it so that it will work in the obd0 chassis it is much easier/smarter to convert to Mpfi with the original harness to the car.

 

no. like KWayRacing you could modify the b7 harness to plug into the obd0 body harness, but you'd still have to buy an ecu jumper harness, and you'd have to convert the body harness to mpfi. the body harness for non ex/hf/si civic/crx's are different, have different plug locations and wire locations and the dpfi don't have all four injector wires ran or the blue/yellow and blue/green wires ran.

 

great, this is all good info. Thanks so much! Picking the motor up monday. It's unknown mileage, but the guy says ran good. Anything to look for??

 

got it, removed the intake, exhaust, and distributor. Now I just need to put on my b2 intake, exhaust, distributor, and harness.

I'm going to go ahead and pull the valve cover off and take off the rocker arm assembly so I can replace those 4 o-rings under there, there is oil in the spark plug tube. Also going to replace the valve cover gasket and the oil pan gasket.

That's all I can do, I guess. And hope that she fires up and runs fine. I pulled the plugs before I bought it and the plugs all looked decent.

 

OK, so I've gotten the motor and replaced the rear main seal, the cam seal, the crank/oil pump seal, oil pan gasket, valve cover and spark plug tube gaskets.

Now I'm trying to figure out the flywheel/clutch/pressure plate. I'm going to mate this with an EF dx or si trans.

Is it ok to use the b7(1992) flywheel/clutch/pressure plate or do I need to buy 89-91 stuff and put it on the b7 motor?

I'm thinking of getting a new clutch/pressure plate/flywheel from Advance because they're having such good discounts, about 40% off!

Anybody have any comments/experience/opinions about the DIY polyurethane motor mounts??

 

use the flywheel/clutch/pressure plate from your old b2 motor or else your tranny might not fit right

 

I did a little research and found that the 89 clutch is smaller than the 90 - mid 90's. Also found that the 92+ flywheels are lighter, but the same size.

So a 92 clutch, pressure plate, and flywheel should be the same size as the 90+91. My one question is this. Is the 89 trans the same as the 90+91? Will the 89 trans fit over the 90+91(which is the same size as the 92) flywheel/pressure plate?

My guess is yes it will, but I wanted to get a confirmation.

 

did the swap. used the 92 clutch, flex plate, flywheel, pilot bearing, but had to use an 89(ef) throw-out bearing. Also the coolant sensor not only is on the thermostat housing on the b7, but the connector is different.

There is a hole on the back of the block where the b2 sensor could screw into, but it didn't seem deep enough.

The shift linkage was so difficult to get out. I asked a friend how to get it out, and he said to use one of the a/c compressor mounting bolts. It is a little pointy so it will stay in place, and it is also the exact right size to push the pin all the way through. That's a good thing to know!

The new motor uses oil. It doesn't really smoke much though... I tried to downshift to third on the highway and then accelerate to see if it was the valve seals, but that produces no smoke. I'm guessing it's the rings?? I threw in a can of engine restore hoping it will help.

Runs great though. I used the permaflex(spelling) the right stuff for imports to make all my gaskets - valve cover, spark plug tube, oil pan, oil pump, and main seal cover. I didn't use one cut gasket, only "the right stuff". Everything's holding so far(500 miles now).

New clutch feels great, i've never driven on a brand new clutch and flywheel before, it's wonderful.

The si trans is... different. I'm not sure I like it. I find myself at a higher RPM on the highway than I am comfortable with. I drive mostly highway, perhaps I should have stuck with my dx trans.

anyways, b7 works in an ef car. How new of a d-motor can i put in my car this way? i'm thinking of putting a 2000 engine in.

 

dang motor burns oil... I suppose i'll just keep filling it until I put in the ZC.

 

HEY EVERYONE THAT HAS OR KNOWS ANYTHING ABOUT THE EF9 HATCHES<<

I HAD A D15B2 AND I THREW A ROD SO I BOUGHT A D15B7
I RECENTLY PUT THE MOTOR IN AND WENT TO SCREW IT ALL UP BUT THE LEFT DRIVER SIDE MOTOR MOUNT DOESNT FITT..
SO I WAS WONDERING IF IM DOING THINGS RIGHT??
I WAS JUST GUNAN SWAPP IT IN AND PUT THE B2 HEAD ON AND LATER ON SWAP IT TO MPFI..
I SWAPED THE CLUTCH FLY AND PRESSURE PLATE
AND ITS ALL TOGETHER AND IN CAR JUST THE ONE MOTOR MOUNT
> IM JUST WONDERING WAT I GOTA DO TO MAKE THINGS WORK??

IF nyone could tell me oe help me out id helal apriciate it!

 

1. Turn your caps off
2. Swap the B2 mount into the B7