"FBNE" > wrote in message
...
> On 7/10/2012 3:42 PM, Dad wrote:
>>
>> "FBNE" > wrote in message
>> ...
>>> I had to replace the alternator on my 2001 and discovered there
>>> are
>>> two versions of alternator. One for auto trans and one for manual.
>>> The
>>> AT alternator has a clutch, the MT does not. Basically, what/why?
>>> What does the clutch do and why does it make a difference? Mine is
>>> an
>>> AT version.
>>
>> Millions of vehicles are now factory-equipped with an Overrunning
>> Alternator Decoupler (OAD) rather than a conventional solid pulley
>> or
>> one-way clutch pulley. A failure to install the correct replacement
>> design could cause severe damage to a vehicle's belt drive system.
>>
>> An OAD Decoupler is similar in appearance to other pulley designs
>> but
>> plays a vital role in synchronizing the belt drive system. When
>> replacing an OAD-equipped alternator, the only acceptable choice is
>> another OAD unit.
>>
>> Many new vehicle accessory drives are realizing a 1.5% to 2% fuel
>> economy improvement with an OAD. These improvements are possible
>> by
>> utilizing a Lean System design philosophy. Lean systems can
>> significantly reduce the common parasitic losses found in accessory
>> drives, due to the belt bending that occurs during operation. The
>> parasitic loss reduction is a result of a holistic approach to
>> accessory
>> drive - drive layout, OAD, and tensioner design/matching.
>>
>> Couldn't have said it better myself, we all know that. ;-))
>>
> Nicely cut. Any idea why the manual doesn't use the same system?
>
Snap and sharp lag, you know, like how you tear out a CLUTCH.