If you want to use a 1.8 CF2 engine you will need to get hold of a 2.0 CF3 exhaust manifold and downpipe (twin-cats) section. The 1.8 CF2 block is taller than a 1.8 CF3 block and fitting a 1.8 CF3 exhaust manifold & downpipe to a 1.8 CF2 engine will leave the downpipe hard up against the underside of the sump. You also need the upper cambelt cover for a 1.8 CF2 engine as its longer, and that brass-coloured bracket with the rubber bush in it that bolts to the back of the engine block and the underside of the inlet manifold will need to be off a 1.8 CF2 or 2.0 (either CF2 or CF3). Make sure the 1.8 CF2 engine still has the ally casting on the timing belt side of the engine as your 1.8 CF3 ally casting is different.
For the ECU you will be fine, 1.8 CF3 ECU will run a 2.0 engine no problem. You don't need to change the ECU but it is preferable if you do, for optimum running. Or you could get your 1.8 ECU remapped with 2.0 software or custom software. You can buy ECU, immo code box and key chips from a 2.0 TS CF3 car, this is probably the cheapest way of doing it. The cam phase sensor & crank sensor are the same on CF2 and CF3. You will need to fit the CF3 throttlebody to the CF2 engine, best to fit your whole inlet manifold with a new gasket. If you want to fit a 2.0 TS then you can get either the CF2 or CF3 engine, it doesn't matter which. I would say if you want to keep it a 1.8 then try and find a CF3 engine. For the extra work of fitting a 1.8 CF2 engine you might as well fit a 2.0 engine, they are easier to find.
- UK's leading independent Alfa Romeo specialist with branches in Bedfordshire, Cumbria & Dorset
Wizard Exhaust systems available here
Tel: 01768 879 171