[DeTomaso] Here's a weird one

[Roland Jaeckel]

There is no need to disconnect to save fuel. As long it takes no load, the 
power to drive it is close to zero.

Roland

--------------------------------------------------
From: "Tomas Gunnarsson" <guson at home.se>
Sent: Sunday, November 06, 2011 11:55 AM
To: "Roland Jaeckel" <pantera874 at t-online.de>; <detomaso at realbig.com>
Subject: RE: [DeTomaso] Here's a weird one

> Thanks Roland. That explains a lot, among other things that it doesn't
> disconnect the alternator drive to save fuel. That would require a 
> different
> approach.
>
> Tomas
>
> -----Original Message-----
> From: Roland Jaeckel [mailto:pantera874 at t-online.de]
> Sent: den 6 november 2011 11:36
> To: Tomas Gunnarsson; detomaso at realbig.com
> Subject: Re: [DeTomaso] Here's a weird one
>
>
> Thomas,
>
> here is a good explanation:
> http://www.litens.com/vibprod1.cfm
>
> Roland
>
> --------------------------------------------------
> From: "Tomas Gunnarsson" <guson at home.se>
> Sent: Sunday, November 06, 2011 10:55 AM
> To: <detomaso at realbig.com>
> Subject: Re: [DeTomaso] Here's a weird one
>
>> I can understand that an on/off clutch can do that but what I know as a
>> sprag clutch can in this application either be in:
>>
>> A: the locked position where the pulley drives the alternator
>> or
>> B: the freewheeling position where the alternator turns faster than the
>> pulley
>>
>> How do sprag clutches work according tou you?
>>
>> Tomas
>>
>> -----Original Message-----
>> From: JEFFREY COBB [mailto:zumzum at cox.net]
>> Sent: den 6 november 2011 01:17
>> To: Tomas Gunnarsson
>> Cc: JEFFREY COBB; detomaso at realbig.com
>> Subject: Re: [DeTomaso] Here's a weird one
>>
>>
>> The sprag is used in many German cars. The clutch removes most parasitic
>> drag and vibrational periods of the alternator for fuel economy reasons
>> and
>> belt life. The alternator can now keep up a higher speed.
>> On Nov 5, 2011, at 6:12 PM, Tomas Gunnarsson wrote:
>>
>>> When's a sprag on an alternator pulley supposed to be of use? To allow
>>> the
>>> alternator to keep spinning when you turn the engine off?
>>>
>>> Just asking...
>>>
>>> Tomas
>>>
>>> -----Original Message-----
>>> From: detomaso-bounces at realbig.com
>>> [mailto:detomaso-bounces at realbig.com]On Behalf Of Will Kooiman
>>> Sent: den 5 november 2011 03:32
>>> To: detomaso at realbig.com
>>> Subject: [DeTomaso] Here's a weird one
>>>
>>>
>>> My wife called me last week while she was on the way to work.
>>>
>>>
>>>
>>> She said she heard a crunch, the power steering went out, and all of the
>>> lights on the dash came on.  I'm assuming it was more than just the 
>>> check
>>> engine light, but I didn't see it so I can only go by what she 
>>> described.
>>>
>>>
>>>
>>> The same thing happened to me in her car 2 years ago.  The water pump
>>> cracked badly around the bearing.  It dumped water on the ground, plus 
>>> it
>>> made the serpentine belt pop off.  $800 later ('00 Boxster-S), and it 
>>> was
>>> all better.  I figured the same thing had happened this time.
>>>
>>>
>>>
>>> Not so.  This time it was a failed alternator clutch.  Yep - not a typo.
>>>
>>>
>>>
>>> Her car has a sprag clutch on the alternator pulley.  A sprag is a one
>>> way
>>> ratcheting bearing.  It free wheels in one direction only.  The clutch
>>> had
>>> been locked up for who knows how long.  The failure was the inner shaft
>>> walking off of the sprag.  It eventually walked enough to make the
>>> serpentine belt pop off.
>>>
>>>
>>>
>>> It's a good thing it wasn't the water pump.  I wasn't looking forward to
>>> another $800 repair bill.  This time it was only $440 - not counting the
>> tow
>>> truck.
>>>
>>>
>>>
>>> I'm going to try to talk her into a Mangusta.
>>>
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