| Share | Phrase |
| 32.53% | incoming [direction] air |
| 20.74% | incoming [direction] mixture |
| 9.63% | incoming [direction] fuel |
| 7.95% | incoming [direction] charge |
| 5.07% | incoming [direction] gas |
| 4.54% | incoming [direction] stream |
| 3.99% | incoming [direction] signal |
| 2.63% | incoming [direction] flow |
| 2.61% | incoming [direction] combustion |
| 1.70% | incoming [direction] fluid |
| 1.63% | incoming [direction] gasses |
| 1.30% | incoming [direction] water |
| 1.22% | incoming [direction] pressure |
| 1.14% | incoming [direction] flowing |
| 1.13% | incoming [direction] supply |
| 0.85% | incoming [direction] path |
| 0.64% | incoming [direction] passage |
| 0.59% | incoming [direction] direction |