Can the horsepower of a car be given per cylinder ?

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Discussion Overview

The discussion revolves around the concept of dividing the total horsepower of a car's engine by the number of cylinders to estimate the horsepower per cylinder. Participants explore whether this method provides a reasonable approximation of the power transmitted by each piston, considering factors such as engine design and synchronization.

Discussion Character

  • Exploratory, Conceptual clarification

Main Points Raised

  • One participant questions if dividing the total horsepower of a V8 engine by 8 to estimate horsepower per piston is valid, drawing an analogy to multiple people lifting weight together.
  • Another participant agrees that this division can serve as a rough estimate, suggesting that synchronized effort could yield a similar outcome.
  • A third participant notes that while power per cylinder is generally consistent, variations may arise due to intake manifold design and ECU adjustments for fuel flow and spark timing, implying that not all cylinders may receive the same power output.

Areas of Agreement / Disagreement

Participants express differing views on the validity of the horsepower division method, with some supporting it as a rough estimate while others highlight potential discrepancies due to engine design factors. The discussion does not reach a consensus.

Contextual Notes

Participants acknowledge that factors such as air flow differences and ECU fuel management could affect the actual power distribution among cylinders, indicating limitations in the initial estimation approach.

Who May Find This Useful

Individuals interested in automotive engineering, engine performance analysis, or those curious about power distribution in multi-cylinder engines may find this discussion relevant.

knight92
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say a car has 400 horsepower at the fly wheel with a V8. can you divide 400 by 8 to give 50 hp of power transmitted by each piston ? Just for a rough estimate, does it even come close to the real power transmitted by each piston or is way far off and wrong ?

The reason why I think of this way is because, consider 1 person being able to deadlift 100 kg. Now 4 people should be able to deadlift close 400 kg together ?
 
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Yes, as a rough estimate.

If the 4 persons work together in a synchronized way, why not.
 
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For an engine, the power per cylinder for each cylinder is about the same. The differences are related to the air flow differences to each cylinder due to the intake manifold design. On a car with fuel injection, the ECU could vary the fuel flow (maybe even spark advance) to each cylinder based on known factors, but my guess is most ECU's use the same fuel flow rate for all cylinders.
 
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thanks for your replies.
 

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