Mailing List flyrotary@lancaironline.net Message #19589
From: kevin lane <n3773@comcast.net>
Subject: Re: [FlyRotary] Re: under drive pulleys
Date: Wed, 30 Mar 2005 09:32:15 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
no, these are just deep V pulleys.  I don't know much about these things, but it seems to me that the gilmer concept introduces restrictions on sizes so that the integral number of teeth work out for the circumference.  Rob recommended the deep V because at 9800rpm the centrifugal force on the belt makes it more likely to skip off.  The motor we were looking at actually didn't have the deep V.  I would think that the Gilmer pulley is a lot harder to machine, thus cost more.
    I assume we could make alt. pulleys too at whatever size we wanted, they don't look much different than the water pump pulleys.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
----- Original Message -----
Sent: Wednesday, March 30, 2005 8:51 AM
Subject: [FlyRotary] Re: under drive pulleys

 
Kevin,
The $350.00 pulleys I saw were Gilmer toothed pulleys, Are these the same? what about the alternator pulley?
Georges Boucher
Christavia MK IV/13b
  

I spoke with a machine shop friend today about making pulleys.  He shows me his Mazda race car with a 400hp PP 13B, which I didn't know he had.  He believes that a single pulley with a deep groove should work fine, and that yes, often one belt will take out the redundant belt.  He runs his engine up to 9800rpm without belt problems.  His pulleys are 5 1/8 on the water pump, 3 1/2 drive, which just about touch.  He can make us sets for $110, a bit more for double pulleys.  He has an automatic tool changing mill with something like 27 tools available on this giant chain.  It is way cool to watch run.  Pulleys get made on the lathe however.  AL comes in 5 and 5 1/2" sizes, so a 5" pulley may be a better buy than 5 1/8".  He would make the pulleys to order, not as batches, so a 17 or 19mm center hole is no problem.  I wondered how many people were interested in getting some made.  I have not seen any for sale at tese prices, although I may have missed some.  I saw some sets as high as $350.
Kevin Lane  Portland, OR
e-mail-> n3773@comcast.net
 
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