Return-Path: Received: from out005.verizon.net ([206.46.170.143] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2620292 for flyrotary@lancaironline.net; Wed, 01 Oct 2003 15:21:18 -0400 Received: from verizon.net ([4.5.52.156]) by out005.verizon.net (InterMail vM.5.01.05.33 201-253-122-126-133-20030313) with ESMTP id <20031001192112.UCGC15786.out005.verizon.net@verizon.net> for ; Wed, 1 Oct 2003 14:21:12 -0500 Message-ID: <3F7B2A26.2080907@verizon.net> Date: Wed, 01 Oct 2003 12:25:26 -0700 From: Rick Girard User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: alternator choice and pulleys? References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------050309030503030200090600" X-Authentication-Info: Submitted using SMTP AUTH at out005.verizon.net from [4.5.52.156] at Wed, 1 Oct 2003 14:21:12 -0500 This is a multi-part message in MIME format. --------------050309030503030200090600 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Russell Duffy wrote: > I use the GEO alt and an advantage with it is that if you kill power > to the exciter lead it will stop the power output so you can shut it > down in the event of a voltage overrun. > > Ken Welter > > > East Coast confirmed that the UltraMini works like that as well. > After seeing Mark's message, I called around, but the cheapest I could > get one was $135 + $35 core, and that was for a rebuilt unit. I just > went ahead and ordered a new alt from East Coast for $219. > > Now, the problem will be coming up with a double pulley. They said > the shaft was 15mm, and the normal size was 17mm, so finding a double > pulley might be tricky. If I can't make one work, then I'll have > to consider using just a single V belt, or trying to convert to a > serpentine belt. On one hand, a dual belt seems like it would be > twice as likely to keep the water pump running, but in reality, it's > not. If the outer belt comes off, the inner could remain, but if the > inner comes off, the outer belt will go with it. It's tough to say if > it really offers any redundancy, but it does offer more contact area > on the water pump pulley, which has a terrible geometry already. > > Cheers, > Rusty > > > > > Rusty, Racing Beat has a double pulley in aluminum and of a bit bigger size than stock to reduce alternator RPM. Should fix everything in one shot. > Aluminum Alternator > Pulley - 2 Sheeve > > Part Number: 11479 > Retail Price: $42.00 Rick Girard --------------050309030503030200090600 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Russell Duffy wrote:

Message
I use the GEO alt and an advantage with it is that if you kill power
to the exciter lead it will stop the power output so you can shut it
down in the event of a voltage overrun.

Ken Welter

East Coast confirmed that the UltraMini works like that as well. After seeing Mark's message, I called around, but the cheapest I could get one was $135 + $35 core, and that was for a rebuilt unit. I just went ahead and ordered a new alt from East Coast for $219.

Now, the problem will be coming up with a double pulley. They said the shaft was 15mm, and the normal size was 17mm, so finding a double pulley might be tricky. If I can't make one work, then I'll have to consider using just a single V belt, or trying to convert to a serpentine belt. On one hand, a dual belt seems like it would be twice as likely to keep the water pump running, but in reality, it's not. If the outer belt comes off, the inner could remain, but if the inner comes off, the outer belt will go with it. It's tough to say if it really offers any redundancy, but it does offer more contact area on the water pump pulley, which has a terrible geometry already.

Cheers,

Rusty

Rusty, Racing Beat has a double pulley in aluminum and of a bit bigger size than stock to reduce alternator RPM. Should fix everything in one shot.

Aluminum Alternator
Pulley - 2 Sheeve

Part Number: 11479
Retail Price: $42.00

Rick Girard

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