1. Air filters can remove particles and dirt as small as ________ . a. 5 to 10 microns b. 10 to 25 microns c. 30 to 40 microns d. 40 to 50 microns 2. Why do many port fuel-injected engines use long...

1. Air filters can remove particles and dirt as small as ________ . a. 5 to 10 microns b. 10 to 25 microns c. 30 to 40 microns d. 40 to 50 microns

2. Why do many port fuel-injected engines use long intake manifold runners? a. To reduce exhaust emissions b. To heat the incoming air c. To increase high-RPM power d. To increase low-RPM torque