splitting captured avi file

Hi..i recently captured 90 minutes of footage for a community projectd in Vegas pro8. Files were saved as a 13gb & a 8gb avi file. I would like to split the avi files to give to someone to edit in Final Cut with his Mac.I assumed i could load the footage into Vegas, cut to smaller portions, and render out as an avi, and avoid recompression and quality loss. Was hoping to be able to fit files on a few dvd disks . I must be doing something wrong as the 8gb file i split in half renders out to 47gb, yes not 4.7gb, file size so no way i am gonna burn those to disk. Would anyone know what i am doing wrong or maybe a better way to handle this? Any help would be much appreciated...Thanks