Andrew Barrowman's goal five minutes before half time was enough to see Keith Bertschins side secure their third win in four Barclays Premiership Reserves League North games.
Midfielder Darren Anderton stepped up his match fitness by completing the full ninety minutes in this his second outing for the second string.
Blues: Colin Doyle, James Blake, Mathew Sadler, Samuel Oji, Martin Taylor, Darren Carter, Darren Anderton, Neil Kilkenny, Andrew Barrowman, Peter Till, Carl Motteram, Subs: James Dormand, Dean Curtis, Asa Hall, David Howland, Liam Reynolds.
Man City squad: Schmeichel, Bischoff, Onuoha, Jordan, Nathan D'Laryea, Christian Negouai, Jonathan D'Laryea, Croft, Collins, Bradley Wright-Phillips, Ireland, Diomede, Murphy, Matthewson, Laird, Bennett, Bermingham