Quiz - Engine Performance
Car Smarts: Engine Performance
Whether racecar 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.
1) Bolt-on accessories that make it easier for your engine to push exhaust gases out of the cylinders are called:
2) If you're using an exhaust header with a four-cylinder engine, how many exhaust pipes will you have?
3) Why do properly inflated tires improve fuel efficiency?
4) During the exhaust stroke, many engines lose power through:
5)Nitrous oxide improves engine performance by providing more what?
6) What other benefits does nitrous oxide provide?
7) Why do cars normally carry only a few minutes worth of nitrous oxide?
8) How much faster can the turbine in a turbocharger spin when compared to a regular car engine?
9) How many valves per cylinder do dual overhead camshafts typically have?
10) Three fundamental causes can keep your engine from running. Which of the following is not one of them?
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Re: Quiz - Engine Performance
Correct Answers -
1) Headers - Headers improve engine performance by making the exhaust stroke less power intensive.
2) Four - Exhaust headers eliminate back pressure by giving each cylinder its own exhaust pipe.
3) 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.
4) Back pressure - Engines tend to waste power during the exhaust stroke when they come up against the resistance of back pressure.
5) Oxygen - When nitrous oxide is heated, it splits into nitrogen and oxygen, making more oxygen available to the engine during combustion.
6) 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.
7) 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.
8) 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.
9) 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.
10) Worn-out ball bearing - 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.