Dear N:

You wrote:

1-I felt the excitement: the rumbling of the engine, the wind blowing in my face, the speedboat accelerating.

You feel excitement. The appositive then describes three things that comprise the excitement.

2-I felt the excitement: the rumbling of the engine, the wind blowing in my face and the speedboat accelerating.

This says the same thing as #1 but there is a comma missing after “face.”

3-I felt the excitement, the rumbling of the engine, the wind blowing in my face, the speedboat accelerating.

This is not the same as #1 and #2. The colon sets off an appositive in #1 and #2. Here you simply have compound direct object. The meaning is slightly different. In #1 and #2 you feel the excitement and specify three things that characterize the excitement. Here you feel four things, exictement being one of them.

4-I felt the excitement, the rumbling of the engine, the wind blowing in my face and the speedboat accelerating.

This says the same thing as #3 but there is a comma missing after “face.”