Stop caching for a specific node type Drupal 7
See if http://drupal.org/project/cacheexclude can do it for you. If not you need to create a module that will implement hook_init. Inside of that hook you need to load the node from arg() from there see if the node is of a certian type; if it is disable the page cache.

&lt;?php
  // Get the current active node object if present.
  $node = menu_get_object();
  if (!empty($node) &amp;&amp; !empty($node-&gt;type) &amp;&amp; $node-&gt;type == 'page') {
    drupal_page_is_cacheable(FALSE);
  }
?&gt;