Have to say mines done 70K and dosen't use any! I can't understand why you are thinking about fitting an inferior, heavier and older engine which has less power than the one you have now, thing is with the Focus is it's a fairly heavy car so by definition it's not going to be that fast, thats why the engine is better suited in the lighter Fiesta which Ford deemed a sporty model.

You can look at tuning the current engine, check out www.shawspeed.com , around 140HP is possible, with T/B, cams, induction, remap etc.

Don't even think about the 1.8, 2.0 completely different engines bar the name, (Covered loads on here, it's from the same family incidentally that the 1600 you talk of), the inlet and exhaust manifold are on opposing sides, it's simply to much effort and ideally would need a donor car due to the parts needing to be changed, suspension etc, general concensus is to buy one in the first place!

I tend to find them a very high geared car (To high imo) I think this is what causes them to be unresponsive low down, they have the same power/torque as Vauxhalls Ecotec equivilant.


Martin