Lister Engines > Lister Based Generators

Looking for the "engine to alternator" pulley size calculator

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**sb118**:

I know it's here somewhere but i can't find it!

cheers.

**Halfnuts**:

What for you need a calculator? The ratio of the diameter of the two pulleys will be the same ratio as the rpm ratios.

Diameter 1 * RPM1 = Diameter 2 * RPM2

Example:

You have a 24" flywheel turning 650 RPM and you need 1800 RPM at the generator. What size pulley do you need on the genny?

Diameter 2 = (Diameter 1 * RPM1)/RPM2

Diameter 2 = (24" * 650 RPM)/1800 RPM

Diameter 2 = 8.67" pulley will give you 1800 RPM at the generator.

**jimmer**:

This is handy too.

http://www.roadlessgear.com/html/techarticles/beltlength/index.php3

jim

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