Just had a look at my car and the two main air hoses weren't that tight, in fact the band wasn't really keeping the hose in place and had slipped back a bit.
I realise you shouldn't overtighten them as old hoses can just perish.
I nipped up a bit, but not too much, even then it turned easily the first couple of turns.
How much room should be left for expansion?
Car is a Signum 3.0 V6 CDTi with the Y30DT engine.