Can you tell the difference between a camshaft and a stick shift? You will once you take the engine performance quiz. See if you know what makes your car get up and go.
Bolt-on accessories that make it easier for your engine to push exhaust gases out of the cylinders are called:
If you're using an exhaust header with a four-cylinder engine, how many exhaust pipes will you have?
Why do properly inflated tires improve fuel efficiency?
- they decrease the force of friction
- they counteract the force of gravity
- they're lighter
During the exhaust stroke, many engines lose power through:
- exhaust manifolds
- back pressure
- exhaust headers
Nitrous oxide improves engine performance by providing more what?
What other benefits does nitrous oxide provide?
- a cleaner-burning fuel
- a cooling effect
- a quieter performance
Why do cars normally carry only a few minutes worth of nitrous oxide?
- it's difficult to find
- it's expensive
- it's fairly bulky
How much faster can the turbine in a turbocharger spin when compared to a regular car engine?
- 10 times faster
- 20 times faster
- 30 times faster
How many valves per cylinder do dual overhead camshafts typically have?
- just two
- at least four
- six or more
Three fundamental causes can keep your engine from running. Which of the following is not one of them?
- bad fuel
- lack of compression
- worn-out ball bearings
Which of the following is considered an improvement in engine performance?
- better fuel economy
- louder exhaust sounds
- more impressive revving noises
What does the engine need to go faster?
- more nitrous oxide and a better turbocharger
- less air and more fuel
- more air and more fuel
How much power does a supercharger add?
- 25 percent more
- 50 percent more
- 200 more horsepower
How fast does a supercharger spin on its own?
- 25,000 rpm
- 50,000 rpm
- 150,000 rpm
Which of the following projects can be a DIY job for a beginner?
- installing a supercharger
- machining the valves
- performing a drivetrain swap
How does an air filter improve performance?
- It heats the air.
- It adds special chemicals to the air.
- It improves air flow.
Which of the following aftermarket performance parts are designed to be washable and reusable?
- air filters
- nitrous injectors
How does a cold air intake kit improve performance?
- It improves the air-fuel mixture.
- It helps the engine spin faster.
- It takes pressure off the radiator.
Which of the following projects is the easiest?
- installing a turbocharger
- installing a hood scoop
- installing a performance chip
What does a performance chip do?
- adds more memory to the car’s computer
- helps the engine run without as much gas
- alters the engine programming in the car’s computer
What’s a free way to improve a car’s performance?
- take out the headliner and interior door panels to save weight
- make a spoiler out of junkyard scraps
- trade your car for someone else’s
Which of the following parts are easy to swap for lighter-weight alternatives?
Which of the following statements is true?
- Glass windows are lighter than acrylic windows.
- Disc brakes are lighter than drum brakes.
- Original body panels are lighter than carbon fiber body panels.
What is drive line lash?
- hitting the gas so hard that the driveshaft cracks
- hitting the gas so hard that your head snaps back
- wasted torque from natural engine movement
How can drive line lash be improved?
- Install firmer motor mounts.
- Install softer motor mounts.
- Install racing harnesses.
How much horsepower does a cold air intake add?
- 10 percent
- 25 to 50 horsepower
- 5 to 7 horsepower
How does a cat-back exhaust improve performance?
- The pipes are curved.
- The pipes are straighter.
- The pipes are insulated with cat fur.
One car part is notable for its strict environmental regulations, meaning that it’s illegal to replace it unless it’s broken. Which part?
- the tires
- the catalytic converter
True or false: an engine flush is recommended to improve performance.
- false, always
- true, always
- true, in older cars
What might cause a car to run at less-than-factory performance?
- a buildup of crud on the engine
- a radio that was removed to save weight
- the perfect mix of air and fuel