Increasing the load on an engine using a...

Question 1 of 270705eccefa2bacbc34ba4d4786a

Increasing the load on an engine using a double-helix type injection pump varies the effective stroke of the pump to start __________.

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Question 1 of 27070

Q

Increasing the load on an engine using a double-helix type injection pump varies the effective stroke of the pump to start __________.

🔍 Key Concepts

• Double-helix (helical) fuel injection pump control principle • Relationship between fuel quantity and injection timing/duration • How effective stroke (start and end of delivery) changes when engine load (fuel) is increased

💭 Think About

• Picture the plunger and helix: if you rotate it to give MORE fuel, does the spill port get uncovered sooner or later? • For higher load, do you want the injector delivering fuel for a longer or shorter period of crank angle? • When the effective stroke increases, what must happen to the beginning and end of injection relative to crankshaft rotation?

✅ Before You Answer

• Verify how a helical control edge changes both the start and end of delivery as the rack moves for more fuel • Check whether increased load means advancing or retarding the start of injection, and whether it prolongs or shortens the end point • Eliminate options that would make the effective injection period shorter when more power (more fuel) is demanded