Info: Engine Sizes

The Ford Focus Mk2 is available in the following engine sizes:

The engine line up for the Mk 2 is a mixture of old and new. Revised versions of the 1.4 L and 1.6 L all aluminium Zetec-SE engines from the previous generation Focus were carried over, although the units were now renamed Duratec, with the addition of 1.6 L Duratec Ti-VCT engine with variable valve timing.
The 1.8 L and 2.0 L Zetec petrol engines of the original were heavily revised and renamed Duratec HE. This engine is not based on a Mazda MZR engine as in the American Focus, and is very different to the smaller 1.25L, 1.4 L and 1.6 L Duratec engines (which are versions of the Yamaha-developed Sigma/Zetec-SE engines first used in the 97 facelift Fiesta).
The PSA-developed Duratorq Diesel engine in 1.6 L 90 hp and 110 hp editions, Ford's own 'Lynx' Duratorq 1.8L 115 hp diesel carried over from the previous model and the PSA DW10 diesel in 2.0 L form rounds off the range in standard Focus guise (this is a different unit to the 'Puma' diesel in the Mondeo).

Petrol
1.4 L Duratec
1.6 L Duratec
1.6 L Zetec-SE Duratec Ti-VCT
1.8 L Duratec-HE
2.0 L Duratec-HE
2.5 L Volvo B5254T3 5-cylinder

Diesel
1.6L (90 bhp and 110 bhp) Duratorq (PSA type)
1.8 L Duratorq (Ford "Lynx" type)
2.0 L Duratorq (PSA DW10)

Source: Wikipedia