Remove "-" between words in url

For a spesific custompost type, i need to remove “-” in urls of the posts.

Ive been doing it manually for a while but i believe i can force urls to remove “-” among them. This post type usually have 2 words titles and at most 3 words titles.

Aside from my main reason, there is a minor handicap which is:
Im using custom dir plugin to store my images in custom folders. It works when post is saved. So i need to automaticly change the url when its first written, otherwise it will duplicate.

So i was thinking of Ajax but whatever i did failed. WordPress is already changing names to urls and i cannot find the script or how to add plugin to it to force it.

Any idea or suggestion is welcome at this point.

Thank you