[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
Dave Hall wrote: >Hope that's the case - it is bound to help anyway. >I'd be worried to dismantle one the way Russ said, let alone with a saw as Toby >did. Since I don't have auto it won't be a problem for me. >I wonder what aspect of an auto needs that electrical AAR rather than the >oil-heated one that the manual FI uses. > > Pure speculation here, but I would venture to say that the automatic AAR is more apt to shut quickly than the manual because it's not dependent on the engine oil heating up to close it. Having an engine idling at 1500+ rpm and holding it with the brake while the engine is attempting to spin at that speed is nether good for the engine nor for the torque converter. If the engineers at VW wanted to make sure that the engine stayed at a high idle no longer than necessary, an electrically heated AAR would be a good, predictable way of doing that. Russ would know better, but ISTR that the early automatics had higher failure rates due to overheating of the torque converter. One aspect was the design of the TQ- early ones didn't have the same fins as the later ones. Another aspect is possibly the high idle speed while the engine is cold, and having to have the TQ work on a higher RPM longer than needed. Note that in our automatics, the fluid doesn't run through a radiator to cool it. The tranny has to keep itself cool however it can. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~