Using a simple logo will allow easy recognition from afar - and capturing a solid and strong look from up close. I kept with the spirit of diesel technology with the stacks and black smoke - using black/metal to appeal to the masculinity of the sport.
I've elongated the face and removed the "shield" shape used for the original design of the Deer's Head. Also, I've increased the size of the text - hopefully to your liking. I appreciate the feedback - thanks!