[DeTomaso] Here's a weird one

[Tomas Gunnarsson]

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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