Date: Sun, 23 Sep 2012 12:27:10 -0400
Reply-To: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject: Re: Alternator continuous-duty rating?-V-belt drive rating.
In-Reply-To: <505F3568.4030200@gmail.com>
Content-Type: text/plain; charset="US-ASCII"
And boy can that belt squeal when it tries to charge those GC-2 you plan to
install!
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rocket J Squirrel
Sent: Sunday, September 23, 2012 12:15 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Alternator continuous-duty rating?-V-belt drive rating.
"This is why belt tension is so important [...]"
Lame-o confession: I never know when my belt tension is right. The
push-to-check-deflection thing is so subjective to me that I just don't
trust my results. The engine squeals sometimes when I start it. Reckon it's
the belt.
--
Jack "Rocket j Squirrel" Elliott
1984 Westfalia, auto trans,
Bend, Ore.
On 09/23/2012 07:51 AM, Dennis Haynes wrote:
> The water boxer engine cannot reliably drive a larger alternator due
> to the drive belt set. Most belt drives are designed around the belt
> having a 180 degree wrap around the drive and driven pulleys. On the
> waterboxer the belt only skims around the drive pulley limiting the
> amount of friction available to drive the load. This is why belt
> tension is so important and from the factory a special high tensile
strength belt was used.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of David Beierl
> Sent: Saturday, September 22, 2012 11:13 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Alternator continuous-duty rating?
>
> At 07:41 PM 9/22/2012, Rocket J Squirrel wrote:
>> I don't think the 90-amp rating is a continuous rating. It's probably
>> peak rating, or one-hour rating or something, but not continuous. I'm
>
> Just some context - with 90 amps at 13.6 volts, assuming 85%
> efficiency the alternator will be sucking down about two horsepower
> from the belt and dissipating about 225 watts as heat.
>
> I don't know how much the water pump uses, but you're definitely
> pushing the edges of what most marine folks recommend driving with one
> automotive vee belt, especially the 3L size that we use.
>
> There's a little calculator at
> http://www.gizmology.net/pulleysbelts.htm for required tension and such.
> Only set up for two-sheave systems, but it's something.
>
> I took squint around www.gates.com for hp ratings and got nowhere useful.
> Stopped short of asking an engineer, which they provide for on the site.
>
> Yrs,
> d
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