Not sure,I think you will have to change the eggine mounts at very least.I had thought about putting an ST 2.5 in a C-Max,but health problems have put that thought back until at least this time next year.I want to do it for fun,why do you want to change the engine in an 08 car?
I wouldn`t use a new C-Max,pref a very used one,as for engine,S-Max will do as it can be tuned to same output but I think an engine from an ST write off is the way to go.Gotta tell the wife it`s a project to keep me out of the kitchen & offering to help with the cooking
Right, just had a phone call back and basically both engines are 5 cylinder in-line 20v turdo, but the S-Max is tuned to 220bhp,and the ST isto 225bhp.
The other differences apart from the engine tuning is the gearbox, as although both have a 6 speed the gear ratios could be different too. So it is likely to be a completeswap of the engine, gearbox, and plenty of wiring from the loom I expect....
So Richard, you're probably right in saying that the best motor to go for would be the one from the S-Max.