To much yeast?

I have heard that most new homebrewers including me tend to not pitch enough yeast. I am just curious is it possible to pitch to much yeast?

I am concerned because i plan to pitch right on top of a yeast cake and was wondering if there is a probablem with doing that?

Thanks
Jon

I have never pitched onto a yeast cake, but I do rinse my yeast for use again in the same week or a few months. This link will give you some information to start with.

viewtopic.php?f=13&t=7652

Another link for calculating how much yeast your need.

http://www.yeastcalc.com/indexupdate.html

Yes you can pitch too much yeast. What gravity beer are you planning to pitch on the yeast cake?