10-12-2023, 12:43 PM
(10-12-2023, 04:01 AM)Steve Bryant Wrote: A thought occurred to me when restoring this vacuum wiper motor. Why not make a vacuum tank that is plumbed into the vacuum tube between the engine and the wiper ? Perhaps a one- way valve on the suction side to maintain the vacuum.
What are your thoughts or experiences?
Cheers,
Stephen
Steve, I've spent most of my career in brake systems and - as I'm sure you realise - that's how brake vacuum servos are done. I guess the main issue would be where to put it. A simple plastic NRV on the engine side should suffice to retain vacuum in the reservoir - assuming everything else seals adequately. From a "design" side the thing you'd have to figure out is how big is enough? I have no idea how much vacuum is 'consumed' by the wiper. You could potentially end up in a dead spot where the vacuum in the tank is quickly exhausted and the suck from the engine is insufficient to evacuate the tank back to a level where the wipers work properly (maybe - just thinking out loud).
Another possibility - for those who are hell-bent on making it work and perhaps less concerned about originality - would be a small electric vacuum pump. That could probably be installed out of sight somewhere and should guarantee a steady 'suck'.