Posted by Janicholson on February 03, 2009 at 21:47:43 from (68.112.156.69):
In Reply to: Farmall H pto posted by John B. on February 03, 2009 at 20:07:16:
1/2 rpm will be abpout 270RPM. thus to get to 1500 you need about a 5.5 to one overdrive. I would use no less than a 6" pulley on the compressor, so a 30+ inch pulley would be needed. Since this is too big, a double overdrive might be needed. say 12" to 6" then maybe 13 to 6". These are approximations. a manual shift car trans used backwards will give several gears of over drive usually one would be in the 4 to 5 to one range. Mount it on a trailer and mount the trans in front of it with the driveshaft going to the reversed trans. A shaft tachometer is not too expensive, or could be rented or borrowed. JimN
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