You can see a Stanley in action on Leno's site 'Jay's Garage'. He has a video about him starting it and driving it around.

Leno is proud to be the holder of the speeding ticket issued to the oldest car ever in LA. He was doing about 80 on the freeway in his 1903 Stanley.

The thing sounds like an old time locomotive going down the street. If you wish to see it all in pieces then check out the film 'Seabiscut' with Jeff Bridges since that is supposed to be Leno's Stanley that Bridge's character takes apart.