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<blockquote data-quote="SPL140.2" data-source="post: 4056060" data-attributes="member: 559635">I had a little talk with a certain fella who builds them look at this example chart:15&quot; BeltCrank pulley-&nbsp; &nbsp; Alternator Pulley-&nbsp; &nbsp;&nbsp; %6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0%750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 750 rpms6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 34% +- rpm increase on alternator pulley750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1005 rpms6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 68% +- rpm increase on alternator pulley750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1260 rpms_____________________________________________________________Shorter Belt applied by taking the difference from the stock pulley to the HO pulley.Crank pulley-&nbsp; &nbsp; &nbsp; &nbsp; Alternator pulley-&nbsp; &nbsp; &nbsp; Belt size-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; %6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 15&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0%750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 750 rpms6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 13&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 13% +- rpm increase750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1136 rpms6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 2&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 11&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 27% +- rpm increase750 rpms-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 1600 rpms-______________________________________________________________Difference between changing out beltsAlternator pulley-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Difference (increased rpms)6&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 04&quot;-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 131 rpms2&quot; -&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 340 rpms_______________________________________________________________Just by changing the belt you increased 340 rpms or 27% at idle using the 2&quot; HO pulley than using the stock belt with the 2&quot; pulley.&nbsp; NOTEThis chart is not a test and the numbers are for informational use only and used as an exampleMost vehicles have a 3 to 1 ratio by using a shorter belt you try to match this ratio with the smaller pulley on a HO alternatoregg</blockquote>

[QUOTE="SPL140.2, post: 4056060, member: 559635"] I had a little talk with a certain fella who builds them look at this example chart: 15" Belt Crank pulley- Alternator Pulley- % 6"- 6"- 0% 750 rpms- 750 rpms 6"- 4"- 34% +- rpm increase on alternator pulley 750 rpms- 1005 rpms 6"- 2"- 68% +- rpm increase on alternator pulley 750 rpms- 1260 rpms _____________________________________________________________ Shorter Belt applied by taking the difference from the stock pulley to the HO pulley. Crank pulley- Alternator pulley- Belt size- % 6"- 6"- 15"- 0% 750 rpms- 750 rpms 6"- 4"- 13"- 13% +- rpm increase 750 rpms- 1136 rpms 6"- 2"- 11"- 27% +- rpm increase 750 rpms- 1600 rpms- ______________________________________________________________ Difference between changing out belts Alternator pulley- Difference (increased rpms) 6"- 0 4"- 131 rpms 2" - 340 rpms _______________________________________________________________ Just by changing the belt you increased 340 rpms or 27% at idle using the 2" HO pulley than using the stock belt with the 2" pulley. [B]NOTE[/B]This chart is not a test and the numbers are for informational use only and used as an example[I]Most vehicles have a 3 to 1 ratio by using a shorter belt you try to match this ratio with the smaller pulley on a HO alternator[/I] egg [/QUOTE]

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