owenxguo

I just got my engine this afternoon
it's a J-spec engine (didn't know before) with about 50k miles
It's just a engine and nothing else with it.
the problem is I need a harness for it cause too much differant and I even dont know wha t year is it. That guy told me it's 87 engine but I guess it's not.
I will post some pics later.

Any idea for me?

really thx.

TonyTurboII

Use your old harness.

Mark'sMazda

The J-spec harnesses are different because they are right hand drive.

You can tell the year by looking at the fuel injectors. The tops will be brownish for late 86-87.5, Redish pink from the 87.5-88 I don't know the color of the s5 ones of the top of my head, but the plugs are ovel shaped instead of square.

owenxguo

Does it work?
Anything I have to change?

NZConvertible

The J-spec and US-spec blocks are identical. Just use all your old bits.

owenxguo

pics

owenxguo

turbo

GtoRx7

iTrader: (5)

Thats a 89-91 motor, you can tell simply by the water pump, 87-88 have aluminum neck, the 89-91 have a plastic neck like yours.

owenxguo

Oh that's why
thx a lot
any idea on the harness?

marcus219

Who did you buy the motor from? I'd be pissed if I ordered a s4 and he gave me an s5!!!

owenxguo

I ordered a 87 T2 engine and I didnt tell him I want a J-spec engine.
I didnt know it's J-spec engine before. Lucky

hypntyz7

Most of the parts on that engine, you cannot use, if you are installing it into an 87-88 car. You need to take most of the parts off of the engine, install your old 87-88 stuff, and keep the 89-91 turbo, manifold, intercooler, etc. Also leave the flywheel on the engine that is on it now.

BTW< you will need to change your front cover, with the one from your old engine, unless you plan to run premix ONLY.

There is a lot of A) swapping or B) hacking that must take place to make this work.

Infini IV

Why lucky? Engines from engine importers are all known as Jspec's... They are exactly the same as US Spec engines except for a couple smog equipment things. As far as I know, both engines put out the same amount of power... BTW, if you got an 89-91 engine, it would be a good idea to take it back and get the correct year engine for your car.

hypntyz7

Uh, and why do you consider yourself lucky? there is nothing special about a jspec compared to a US spec, other than the fact that they're guaranteed to have sat unused for longer than an a-spec engine. We all know sitting for any period of time undriven hurts rotaries.

owenxguo

I was looking for a J-spec engine for lone time but can not find a good one that s why I feel lucky.
And I want to install this one in my 87 car so I dont want to change everything from my old one
I want to know if I want install this one what should I do?

hypntyz7

I already told you. Use all the parts that are on your old 87 turbo engine, but keep the 89 flywheel and the 89 turbo and manifold.

owenxguo

I will try tomorrow
thx guys

chris-reedtn

youll also have to have the 89-91 ecu do to the fact that the compression is different? I think?

-Chris

hypntyz7

No offense man, but please dont post misinformation, or anything youre not sure about, or just guessing, etc.

FYI, you cannot change ecu's between series, the wiring/plugs are different. HE must maintain one of the 86-88 ECU's in this car (otherwise his car harness will not plug into the ecu at all).

IWNTA20B

As hypntyz7 says, all electrical need to be switched over from the 87-88 year. Other than the rotor weight , everything internally is the same. If you don't have emission testing in your area, I'd hack off everthing that isn't necessary as I've done. The only thing you'll be using is the block , flywheel and turbo. Well, anything that isn't electrical. You'll need to use *your* front cover since 89-91 OMP are electrical versus mechanical. Most should bolt into place except for a few minor things.
Keep the motor instead of changing to a 87-88 unless you have no idea what to do. It has the better turbo as well. Pulling the motor out is the easy part. Rebuilding is the fun part (which you don't have to do). Putting it back all together takes patience if it is your first time. Get a factory service manual and get a Haynes since it tells you what's what in 2 different motors *but* rely on the factory service manual .

IWNTA20B

By the way, after installing the motor and getting it running, I'd be careful as not to boost too high on it yet. You don't know the condition of the internals since it may have been sitting on the floor for who knows how long. I'm sure there will be a lot of carbon built up so it might be a good idea to inject a little bit of ATF into the chambers to soften the carbon. It will smoke on start up but will clear afterwards. ****, I'd take the motor apart and clean it up and re-seal it. But that's just me.

owenxguo

When I got the engine
there is a AT flywheel on it
I ordered new clutch and flywheel yesterday but not sure does it work on it
Finally, I have to put old parts on the new engine and keep this turbo, Nothing else? what do you mean Front Cover?
I am doing mechanic but really new on rotary sorry guys ^_^.

IWNTA20B

Nothing to be sorry about. We all weren't born as a rotary mechanic.
Anyway, if you plan on retaining and using the oil metering pump, you need to use the front cover. It's the aluminum cover at the very front held via 10mm bolts. It's where the water pump attaches to.
Look at your cover and the one on the motor. It's different. When you change it over, watch out for the little O ring. Use some Hylomar to keep it in place.

owenxguo

you mean this one right?
So i just need to change this one?

owenxguo

here