Thanks for the reply mac. That's interesting to hear, and explains why I've pretty much seen only 1.6's on autotrader. I've seen 1.4 Focus lumps advertised on eBay, around £200 is about the going rate for them..

I have read that Fiesta and Puma engines can be interchanged easily between themselves, but I'm not so clear on whether the Focus is the same as both of them. Engines from the three cars all have different codes..

Also, are you sure it's a good idea to plug a 1.6 lump up to a 1.4 loom and ECU? How does the ECU know how to alter the fuelling for the extra displacement, just lambda adaptation? If it's been done before then who am I to question, as long as it will pass an MOT though..

And presumably the engine needs to be from a similar age car as you mentioned because of analogue/digital clocks? What is the crossover date for the Focus?

Thanks again