Make eighth looks like quarter note

[Manolo Padron Martinez]

Hi:

I'm really newbie with lilypond. I've been looking in google about how to change the look of the eighth note to appear like a quarter note. 

I only want to change how the note is draw into the pdf but I don't want to make it a quarter note. In drum partiture looks like better in that way but I need that the note sounds (when I get the midi file) like a eighth note.

I attach a screenshot to ilustrate why I want to do that.

Thanks in advance

Manolo Padrón Martínez

notes.png
Description: PNG image