The amount of fuel injected into a cylinder...

Question 1 / 270705eccefa2bacbc34ba4d4783a

Question 1 of 270705eccefa2bacbc34ba4d4783a

The amount of fuel injected into a cylinder by a unit injector is controlled by __________.

Question 1 of 27070

The amount of fuel injected into a cylinder by a unit injector is controlled by __________.

🔍 Key Concepts

• Unit injector design and how fuel quantity is controlled inside the injector body • Role of the plunger and its rotary movement in metering fuel • Difference between pressure of combustion in the cylinder vs. mechanical control of fuel delivery

💭 Think About

• Think about which part inside a unit injector actually changes the amount of fuel admitted to the high-pressure side, without changing the basic plunger stroke driven by the cam. • Ask yourself: does combustion pressure control fuel quantity, or is it governed before injection by a mechanical feature built into the injector? • Consider how many injections per cam revolution occur and which component can finely adjust the start and stop of injection for each stroke.

✅ Before You Answer

• Verify which option refers to a machined feature on the plunger that times and meters fuel cut-off. • Check whether varying plunger stroke length is normally done on a unit injector for each cycle, or if stroke is fixed by the cam profile. • Confirm that cylinder firing pressure is a result of combustion, not a control input for metering in a unit injector.

Question 1 of 27070

The amount of fuel injected into a cylinder by a unit injector is controlled by __________.

the firing pressure in the cylinder

a metering helix

varying the length of the plunger stroke

varying the clearance between the injector cam and the injector rocker arm

Question 1 / 270705eccefa2bacbc34ba4d4783a

Question 1 of 270705eccefa2bacbc34ba4d4783a

The amount of fuel injected into a cylinder by a unit injector is controlled by __________.

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Question 1 of 27070

The amount of fuel injected into a cylinder by a unit injector is controlled by __________.