Pet has it set up so words like "Turbo" and "Cosworth" (common ford terminology) are not in the database otherwise it would come up with 1000's of matches every search.
Try to refine the search a little: I know it's difficult, I was searching for a thread about a 400bhp cosworth powered series 1...and couldn't think of anything to search for as "cosworth" and "series 1" weren't in there.