Check out these lovely illustrations by Peter Hutton. I found them over at Megadeluxe.com where Hutton explained how he does it.
“Hi Wes, the drawings are not cut aways as in a technical drawing all they are is a freehand drawing of a technical subject ie, I get the car owner to take some of the body pannels off and I sit and draw the details. I also take some photos and construct the drawing in my studio, it is all freehand no computers involved at all.”
– peter hutton
avec http://www.motorsportretro.com
et http://megadeluxe.com