: --------------=20 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 these = prices, although I may have missed some. I saw some sets as high as = $350. Kevin Lane Portland, OR e-mail-> n3773@comcast.net ------=_NextPart_000_0033_01C53509.CD34E220 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

good questions. I'm = sure we could=20 get them anodized. I'll be designing them, so they can be whatever = we want=20 as far as the hub. I assumed that I would simply replace the steel = pulley=20 that I have, making the hub thicker of course. I haven't given it = much=20 more thought than that. One of you guys could tell me how thick = the AL has=20 to be for strength, or my hangar mate who works on hydro dams could(he = works=20 with bolts that torque to several million foot lbs!!!). I assume = that a 5"=20 water pump pulley will be adequate.

Kevin Lane Portland, OR
e-mail-> n3773@comcast.net

----- Original Message -----
From:=20 Kelly = Troyer
To: Rotary motors in = aircraft

Sent: Wednesday, March 30, 2005 = 5:56=20 AM

Subject: [FlyRotary] Re: under = drive=20 pulleys

Kevin,

Sounds like a really good deal.........Does your=20 friend hard anodize his

pulleys to minimize wear........Also is his eccentric shaft = pulley a=20 total

replacement like the "Racing Beat" pulley or does it bolt to the=20 stock

Mazda hub ??

--
Kelly Troyer
Dyke=20 Delta/13B/RD1C/EC2

--------------=20 Original message from "kevin lane" <n3773@comcast.net>: = --------------=20

I spoke with a machine = shop friend=20 today about making pulleys. He shows me his Mazda race car = with a=20 400hp PP 13B, which I didn't know he had. He believes that a = single=20 pulley with a deep groove should work fine, and that yes, often one = belt=20 will take out the redundant belt. He runs his engine up to = 9800rpm=20 without belt problems. His pulleys are 5 1/8 on the water = pump, 3 1/2=20 drive, which just about touch. He can make us sets for $110, a = bit=20 more for double pulleys. He has an automatic tool changing = mill with=20 something like 27 tools available on this giant chain. It is = way cool=20 to watch run. Pulleys get made on the lathe however. AL = comes in=20 5 and 5 1/2" sizes, so a 5" pulley may be a better buy than 5 = 1/8". He=20 would make the pulleys to order, not as batches, so a 17 or 19mm = center hole=20 is no problem. I wondered how many people were interested in = getting=20 some made. I have not seen any for sale at these prices, = although I=20 may have missed some. I saw some sets as high as = $350.

Kevin Lane = Portland,=20 OR
e-mail-> n3773@comcast.net
<= /BLOCKQUOTE>

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