Whether race car driver or casual commuter, odds are you're going to be concerned about engine performance at some point in your driving career. But can you even tell the difference between a camshaft and a stick shift? You will once you take the engine performance quiz.
Q. Bolt-on accessories that make it easier for your engine to push exhaust gases out of the cylinders are called:
- headers
- footers
- mufflers
Drag after "A." to check the answer.
A. headers
Headers improve engine performance by making the exhaust stroke less power intensive.
Q. If you're using an exhaust header with a four-cylinder engine, how many exhaust pipes will you have?
- one
- two
- four
Drag after "A." to check the answer.
A. four
Exhaust headers eliminate back pressure by giving each cylinder its own exhaust pipe.
Q. Why do properly inflated tires improve fuel efficiency?
- they decrease the force of friction
- they counteract the force of gravity
- they're lighter
Drag after "A." to check the answer.
A. they decrease the force of friction
Since well-inflated tires have less contact with the road, they encounter less friction and the engine doesn't have to work as hard to move the car.
Q. During the exhaust stroke, many engines lose power through:
- exhaust manifolds
- back pressure
- exhaust headers
Drag after "A." to check the answer.
A. back pressure
Engines tend to waste power during the exhaust stroke when they come up against the resistance of back pressure.
Q. Nitrous oxide improves engine performance by providing more what?
- nitrogen
- oxygen
- hydrogen
Drag after "A." to check the answer.
A. oxygen
When nitrous oxide is heated, it splits into nitrogen and oxygen, making more oxygen available to the engine during combustion.
Q. What other benefits does nitrous oxide provide?
- a cleaner-burning fuel
- a cooling effect
- a quieter performance
Drag after "A." to check the answer.
A. a cooling effect
When it vaporizes, nitrous oxide provides a cooling effect on the intake air, which increases the air's density and provides even more oxygen inside the cylinder.
Q. 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
Drag after "A." to check the answer.
A. it's fairly bulky
Due to the bulk of nitrous oxide, it takes up a significant amount of space even when compressed into a liquid. Drivers tend to carry only a small amount and use it selectively by pushing a button.
Q. 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
Drag after "A." to check the answer.
A. 30 times faster
Using the exhaust flow from the engine, turbines in a turbocharger can spin the air about 30 times faster than a regular car engine can -- at speeds of up to 150,000 rpm.
Q. How many valves per cylinder do dual overhead camshafts typically have?
- just two
- at least four
- six or more
Drag after "A." to check the answer.
A. at least four
Dual overhead camshafts (DOHC) produce more power and can run at higher speeds since they allow an engine to have at least four valves per cylinder.
Q. 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
Drag after "A." to check the answer.
A. worn-out ball bearings
Although thousands of minor things can create engine problems, the big three include a bad fuel mix, a lack of compression and a lack of spark.
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