2nd Gen 4AFE head/valve cover/intake on 1st gen 4afe block? - Toyota Nation Forum : Toyota Car and Truck Forums

kaidotech · 01-20-2013, 03:30 PM

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I'm getting reading to rebuild my motor with new pistons, rings, oil pump, gaskets, water pump, etc.

My friend has a junked Celica with a 2nd gen 4AFE in has backyard that he is willing to sell me the motor out of. The bottom end is bad he says, something with the crank, but the top end is mint.

Can I take the 2nd gen 4AFE head/valve cover/intake:

And put it on my 1st gen 4AFE engine?

Everything Ive heard says theyll bolt right up. I need a new distributor badly so I figure Ill just buy a new 2nd gen 4afe distro and use that. I also want a set of headers so I can take care of the different exhaust (if it is different) with a new set.

Any help would be greatly appreciated! Im itching to start this project

Basically I would be mating this to my 1st gen 4afe. seems like it should work no problem.

(also will the gen 1 4afe distributor work on the gen2 4afe? the connectors seem to be different so I dont want to use the 2nd gen 4afe distro)

Blof-fan · 01-21-2013, 11:17 AM

Yes, it will phisically bolt up. 4A-series engines parts are interchangable.
But as you already said, the exhaust is different. Compared to the 1st gen, the flange from header to downpipe is different. Where the cast-iron header goes from 4 to 2 pipes, the pipes are behind each other so to say.

On the 2nd gen, the pipes are next to each other (so there is a 90 degrees difference between the pipes)
It's the only reason why I didn't go with a 2nd gen header on my old Corolla. The 2nd gen header is much nicer than the cast-iron cracker of the 1st gen.

Something else to think about: Are you also going to use the ECU and wiring loom from the 2nd gen?
Most sensors are on the cylinderhead and they do differ between the two generations. So it would be easier to use the 2nd gen wiringloom unless you want to modify your current loom. That would solve the problem with the dizzy too

The 2nd gen might run on the 1st gen ECU (I do not know this for certain!) but since the intake, exhaust, and some of the sensors are different (and the programming of the ECU is different as well) I think you should go with the 2nd gen ECU as well. That way you will know for sure you get the 115bhp the 2nd gen makes.

kaidotech · 01-21-2013, 11:59 AM

Quote:

Originally Posted by Blof-fan

Yes, it will phisically bolt up. 4A-series engines parts are interchangable.
But as you already said, the exhaust is different. Compared to the 1st gen, the flange from header to downpipe is different. Where the cast-iron header goes from 4 to 2 pipes, the pipes are behind each other so to say.

On the 2nd gen, the pipes are next to each other (so there is a 90 degrees difference between the pipes)
It's the only reason why I didn't go with a 2nd gen header on my old Corolla. The 2nd gen header is much nicer than the cast-iron cracker of the 1st gen.

Something else to think about: Are you also going to use the ECU and wiring loom from the 2nd gen?
Most sensors are on the cylinderhead and they do differ between the two generations. So it would be easier to use the 2nd gen wiringloom unless you want to modify your current loom. That would solve the problem with the dizzy too

The 2nd gen might run on the 1st gen ECU (I do not know this for certain!) but since the intake, exhaust, and some of the sensors are different (and the programming of the ECU is different as well) I think you should go with the 2nd gen ECU as well. That way you will know for sure you get the 115bhp the 2nd gen makes.

Would I be better off buying a complete 2nd gen and just dropping that in? Would it be plug and play if I had all the harness? I dont know anything about car electrical stuff.

Blof-fan · 01-21-2013, 12:29 PM

It would be a little less work I guess. Just make sure you get the complete, uncutt wiringloom with it.

It will probably not be entirely plug & play.
You basically have two wiringlooms in your car. The wiringloom for the engine and the wiringloom for the body of the car (lights etc).
The engineloom plugs into the ECU but some wires of the body wiringloom (battery etc.) will have to be connected as well.
Those connections may differ from different types or generation Toyota's
and you may have to get the right wires in the right terminals, but that should be doable.

kaidotech · 01-21-2013, 01:31 PM

Quote:

Originally Posted by Blof-fan

It would be a little less work I guess. Just make sure you get the complete, uncutt wiringloom with it.

It will probably not be entirely plug & play.
You basically have two wiringlooms in your car. The wiringloom for the engine and the wiringloom for the body of the car (lights etc).
The engineloom plugs into the ECU but some wires of the body wiringloom (battery etc.) will have to be connected as well.
Those connections may differ from different types or generation Toyota's
and you may have to get the right wires in the right terminals, but that should be doable.

You wouldnt happen to have a shot of what this loom looks like that I need to pull off the car? I dont know what wires I need for the swap. There are also a Celica and AE101 in a local junk yard I have access to.

Blof-fan · 01-21-2013, 02:16 PM

I don't have a picture of the wiringloom.
But if you start to take the wiringloom off the engine, it kind of explains itself.

kaidotech · 01-21-2013, 07:07 PM

Will the Ae101 cpu play nice with my 4spd auto? Also will the new head change the compression?

Blof-fan · 01-22-2013, 09:53 AM

Pfff, I don't really have much experience with Automatic gearboxes. We mostly drive stick over here

But my guess is that when the donor car has an automatic gearbox as well it should work out.

And I don't believe the compression ratio was changed between the generations, but I'm not 100% sure of that.

SuperRA · 01-22-2013, 11:19 AM

Quote:

Originally Posted by kaidotech

Will the Ae101 cpu play nice with my 4spd auto? Also will the new head change the compression?

I don't know if you have the A240E (electronic version) in your car or not, but I'm guessing the later AE101 has it. If you have the A240L, and the AE101 ECU is fine without having a transmission hooked up, then you should be ok, otherwise you may need to find a manual trans ECU for the AE101. If you actually do have an A240E, then it may all just work out.