Hide admin bar on certain post type

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Don’t hack your WordPress core. It’s overriden after every upgrade (plugins do exist for some reason).

You can solve your problem in this way:

1) Open your single.php.
2) Define 

<?php 
function hideAdminBar ($post_id)
{
    if (get_post_type ($post_id) == 'post')
    {
        add_filter ('show_admin_bar', '__return_false');

        /* For removing the top blank space. */
        echo '<style type="text/css" media="screen">
            html { margin-top: 0px !important; }
            * html body { margin-top: 0px !important; }
            </style>';
    }
} 
?>

3) Inside The Loop, call this function right after the while condition. Like this:

<?php while ( have_posts() ) : the_post();?>

    <?php hideAdminBar (get_the_ID ()); ?>
    /* etc. */

<?php endwhile; ?>

Hope this solves your issue.

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