Remap C-SPC binding

[RC]

evil-mode seems to take over the C-w and C-SPC key bindings.
I was able to unbind C-w using the following commands, but C-SPC still 
seems bound in insert mode.

(eval-after-load "evil-maps"
  (dolist (map '(evil-motion-state-map
                 evil-insert-state-map
                 evil-emacs-state-map))
    (define-key (eval map) "\C-w" nil)))

(eval-after-load "evil-maps"
  (dolist (map '(evil-motion-state-map
                 evil-insert-state-map
                 evil-emacs-state-map
                 evil-insert-state-local-map ))
    (define-key (eval map) (kbd "C-SPC") nil)))


I am using emacs 24.3 and updated evil from MELPA.

Any suggestions to fix this will be appreciated.