Alternator pulley ratio calculator

This calculator helps you determine the pulley ratio for an alternator setup, ensuring optimal performance and compatibility with your engine.

Input Parameters

Calculation Results

Calculation Formula

Pulley Ratio = (Alternator Pulley Diameter / Engine Pulley Diameter) * (Alternator RPM / Engine RPM)

Where:
- Pulley Ratio: The ratio of the alternator's rotational speed to the engine's rotational speed.
- Alternator Pulley Diameter: The diameter of the alternator's pulley.
- Engine Pulley Diameter: The diameter of the engine's pulley.
- Alternator RPM: The rotational speed of the alternator at idle.
- Engine RPM: The rotational speed of the engine at idle.

Alternator pulley ratio calculator Calculator Usage Guide

Learn how to use the Alternator pulley ratio calculator calculator and its working principles

How to Use the Calculator

  1. Enter the engine RPM at idle in the first input field.
  2. Enter the alternator RPM at idle in the second input field.
  3. Enter the engine pulley diameter in the third input field.
  4. Enter the alternator pulley diameter in the fourth input field.
  5. Click the "Calculate" button to compute the pulley ratio.
  6. The calculated pulley ratio will be displayed in the result field.

Understanding the Pulley Ratio

The pulley ratio is a crucial factor in ensuring that the alternator operates efficiently at the correct RPM. A higher pulley ratio means the alternator spins faster relative to the engine, while a lower ratio means it spins slower. The optimal pulley ratio depends on the specific requirements of your alternator and engine setup.

Principle of Operation

The pulley ratio is calculated by dividing the alternator pulley diameter by the engine pulley diameter and then multiplying by the ratio of the alternator RPM to the engine RPM. This formula ensures that the alternator generates the required electrical output while operating within the optimal RPM range.