Well, there are easy ways, and there are harder ways
HARDish:
- 2d fluids grouped with the piston/smokestack geometry.
EASY:
- sprites/SWparticles grouped to the geometry.
- Export camera data from Maya into After Effects
and animate smoke footage there to your parts.
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com