Re: 55-6 Vacuum wiper motor

Posted by BH On 2009/2/17 8:27:55

Packard flet a second source was a good idea - enough that they added he balacing valve and vac pump piggybacke off the oil pump. The idea behind it all was that as egnien demand increased, manifold vacuum feel off, but as engine RPM increased, vacuum generated by the oil pump set-up would increase.

AM engineers opted for their own oil pump for the Packard V8 isntallation, sans vacuum pump, but also used vacuum-driven wipers motors. Apparently they liked the balancing valve idea, but turned to a dual-action fuel pump. a 20OK lifespan doesn't sound too bad on a car that isn;t driven on a daily basis, yet I wonder if that's due to tired old rubber. As BigKev showed us in his article, the dual-action pumps aren't terribly hard to rebuild.

As for authenticity, I've seen more than one V8 Packard at a show that was refitted with dual-action fuel pump to accomodate for reatined vacuum wiper motor when the PI-modified pump was added. Again, I've no doubt the idea was inspired by the Hash implementation.