Discussion Overview
The discussion revolves around determining the optimal speed for running a 12V alternator on a diesel engine boat, particularly focusing on the implications of pulley sizes and engine RPMs. Participants explore the relationship between alternator performance and engine speed, considering practical adjustments to improve efficiency.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions the optimal speed for a 12V alternator, noting that their diesel engine does not exceed 2500 RPM and suspects the drive pulley is too large.
- Another participant suggests that the optimal speed depends on the specific alternator model, referencing the Delco Remy 21SI series as an example.
- A participant calculates that a 2:1 diameter ratio between the alternator and flywheel pulleys would allow the alternator to run at an adequate speed, given the maximum engine RPM of 3000.
- The same participant mentions that their alternator is a Valeo model, speculating that its speed characteristics may be similar to those of the Delco Remy alternators discussed.
- Concerns are raised about the current output of the alternator, with one participant noting they have only measured 10A output despite a 40A maximum rating.
Areas of Agreement / Disagreement
Participants do not reach a consensus on the optimal speed or the exact adjustments needed for the alternator setup. Multiple viewpoints regarding the relationship between pulley sizes and alternator performance are presented, indicating ongoing uncertainty.
Contextual Notes
Limitations include the lack of specific measurements regarding pulley sizes and alternator performance, as well as the dependence on the characteristics of different alternator models.
