I like selective focus, and I wasn't even sure this was a motor without the title. Maybe a little more in focus would have garnered a higher score, as far as broad appeal.
I'm sure you are getting comments that this is not sepia. I'm not totally sure about that as I am no scientist or color-ologist. I will say that this DOF is awesome and I love the clarity and texture of this image. It really shines above a lot of other entries. That might be because it's not sepia.
(For what it's worth, I'm probably spending way too much time on this, but I put this in photoshop and used the eye dropper tool with a 101x101px color sample. I got #70685d on the mesh and #4d473e on the engine.)
If the title is any clue, the engine is your focus and here, you have the focus being this hose leading to an out of focus engine. So, I would have used a smaller aperture and had all the image in focus. It still would have had the leading line. At any rate. the details on the focused part are nice and sharp and even though the sepia tone is nearer to black than brown, it still has that brownish/reddish hue, ever so slightly.