1.8 to 2.5 NA

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Killerbumblebee

New member
Alright, I know I've asked these questions before, however:

largely from Seth I have a good idea how to do the 1.8 to 2.5 swap, it looks like I have a 2.5 from the same year as the 1996 brighton (Gabes old car). A few basic questions:

is there a problem with going from the 1.8 SOHC to the 2.5 DOHC? I've heard no, but I want to make sure. They are the same year engine.

secondly, does anyone know of a true "step by step" direction for this swap? I know it's not to difficult, but it'd be nice to have a step one, step two for it.

finally: I have an extra 1.8 wiring harness (well, maybe not harness, the engine wiring). Seth has told me that you just use that, and plug all the wiires from taht into the 2.5 sensors.

other than the harness, the engine, and normal engine fluids, is there anything else I sould have? (other than a new clutch which I'll grab). I'm thinking about a new timing belt as well, while the engine is out.

finally finally: would anyone like to help? I plan on getting the engine all ready to go, and then convincing matt h. that he really wants to let me do it at his dads house in a heated garage. a few extra bodies would be helpfull :-). Thanks guys, I do appreciate it.

 
Depending on the location, i might be able to help. I was thinking about swapping the rs engine into the Brighton temporarily too.

 
I'd caution against an older 2.5 motor. Mediocre performance, tendancy to blow headgaskets, depending on what it came out of, it may require higher octane gas....

 
Thanks, I would prefer a new shiny 2.5, however a few things leave me with the older ones. First they are cheaper, secondly I think it'll be less work putting it in, and finally, I'm planing on turning it into a "2.5 RS" for autocross purpuses. Which means that I have to use the same engine that came in the RS. Thanks for the heads up though, I do appreciate it.

 
Thanks, I would prefer a new shiny 2.5, however a few things leave me with the older ones. First they are cheaper, secondly I think it'll be less work putting it in, and finally, I'm planing on turning it into a "2.5 RS" for autocross purpuses. Which means that I have to use the same engine that came in the RS. Thanks for the heads up though, I do appreciate it.
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Less work to put a 2001 2.5RS motor into your car than it will be to put in a 2.5 DOHC. Why?

DOHC. IIRC, there is an extra cam sensor that your ECU needs to see.

DOHC's only came in '98 and '99 RS's. After that, they went to SOHC.

I don't know what exactly you are looking for in the way of a writeup. If you want: use this size socket, take off this bolt. Next, use this wrench to loosen this.....

forget it. If you need that much guidance, perhaps you should not even consider a swap....

However, I will offer this much:

1: Take OLD motor out.

2: Take intake manifold off of OLD motor

3: Take intake manifold off of NEW motor.

4: Take engine harness off of OLD motor

5: Take engine harness off of NEW motor.

6: Put the OLD engine harness onto NEW motor.

6a: There "may" be a few sensors that don't share the same type of connetors between the 2 motors. Cut and splice. On my 2.5 swap that

consisted of: Engine temp and fuel injectors. Clip the required connectors off of the new harness and replace the ones on the old harness. IIRC, the wire colors are the same for the injectors, but different for the temp sensors. The 2.5 had 1 temp sensor, but the 1.8 has 2. I don't quite recall what I did for that...

6b: Make sure that the crank trigger ring is the same between the motors. If the new motor came out of a 4EAT, and your car is a 5MT, you need to swap them over. Doing so involves doing a timing belt job. You should do it anyway. The trigger ring is the gear that sits right behind the main pulley. You'll know it when you see it.

6c: If your car as an EGR and the new motor does not, you can just plug the vacuum lines. Don't disconnect the sensor, you will get a CEL. Just plug it.

7: Put new intake back on new motor. Use new gaskets where applicable.

8: You may need to re-use your 1.8 throttle body. You may need to make a block off plate for it to function properly. When you have it apart, you will see what I mean.

9: Install new motor with old harness

10: New Power!

Now, this is a down and dirty "how-to". It's a "ghetto" swap. It runs fairly well, but you REALLY should get some sort of EM. The best route for that is an E-Manage Ultimate. There are many write up's on how to wire one into the 1.8 ECU. Check uniquemotorsports.com (if that site is still up), otherwise, hit up Subachad on NASIOC....

 
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