Impe - Inst
- Impeller
- In-line engine
- Inclined engine
- Incomplete combustion
- Independent suspension
- Indicated horsepower
- Indicated mean effective pressure
- Indicated thermal efficiency
- Indicator
- Indicator diagram
- Indirect unjection
- Induced drag
- Induction manifold
- Induction stroke
- Induction system
- Inductor
- Inertia
- Inertia reel
- Infinitely-variable transmission
