From: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] speed reduction pulleys
Date: Thu, 24 Aug 2017 12:50:24 +0800
References: <list-10041327@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-10041327@logan.com>
Message-Id: <2135ED78-D734-45BA-B857-B580F6A0F359@icloud.com>

Thanks Neil.
I=E2=80=99m pretty sure I put a larger pulley on the alternator but not =
on the water pump of the Renesis 4 port.
Tracy are you able to comment on what you used on the Otter or your =
recommendation re water pump drive?

Cheers

Steve Izett
> On 24 Aug 2017, at 9:10 am, Neil Unger <flyrotary@lancaironline.net> =
wrote:
>=20
> Gents,
>=20
>                  Due to my grief in having brand new reduction alloy =
pulleys not driving on a new fan belt, I located the manufacturer in =
China, and at much reduced prices.  Just go into Ebay under "Underspeed  =
pulley set for RX8".  However be prepared to either lathe off (or file)  =
the apexs of the pulley grooves as they are too high and the belt cannot =
bed into the wedges of the pulley for a positive drive.  Stock supplied, =
 they attempt to drive on the apex only and will not drive at all.  =
Reduction sizes are Eshaft and water pump  4 inches and alt is over 3 =
inches (80mm)  The advice I received is that for high speed applications =
the water pump can be as low as 3/4 the e shaft speed. That means you =
can go as low as a water pump pulley of 4 1/2 inches or 110 mm up to 115 =
mm.
>=20
> As I said these are cheap compared to local supply which come from =
China in the first place.  Neil.
>=20
>=20
> --
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