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Author Topic: Looking for the "engine to alternator" pulley size calculator  (Read 5158 times)

sb118

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Looking for the "engine to alternator" pulley size calculator
« on: March 06, 2006, 07:59:37 PM »
I know it's here somewhere but i can't find it!

cheers.
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First love - 1975 Lister SR1, gone to a better place (running a saw bench actually ;))

True love - unknown vintage CS6/1 with SOM flywheels

linkie to the project so far --- http://jestersltd.com/pics/index.php

Lister owners do it at 650 strokes a minute ;)

Halfnuts

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Re: Looking for the "engine to alternator" pulley size calculator
« Reply #1 on: March 06, 2006, 08:17:36 PM »
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.

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jimmer

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Re: Looking for the "engine to alternator" pulley size calculator
« Reply #2 on: March 06, 2006, 08:59:56 PM »
« Last Edit: March 06, 2006, 09:02:05 PM by jimmer »
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