I need suggestion in RAC

Hi Team,

Customer is requested one node rac means just one node first with rac features but not the concept of rag(atcive,offline).

This is requirement:

Need to create one node rac for one application. We have alredy 2 node rac is running on linux 11.2.0.3. so they will addd those nodes to this node if everything is running fine. on new node.

Is this possible to create,

My doubt is initial time creating single node for database with rac features? is normal rac behaviour. How to add this node to already existing node if everything is fine on single node.