Re: Top Suppliers for a '54 Convertible Coupe - Recommendations sought

Posted by HH56 On 2015/1/1 23:51:12
Would a 55-56 pump work for the top only? Maybe a 2nd pump for windows?

If the car were converted to 12v then a stock 55-6 pump would work -- but only for the top.

There is a company with an ebay store which advertises 6v pumps in a similar style to the 55-6 horizontal pump. They offer a package as a retrofit for the original vertical but hard to find parts for Dura or Moraine pump. Looking at their offerings today they only show 6v FoMoCo product pumps with special mounts for those cars. When I looked thru their pumps earlier in the year, they also listed Packard but specifically say their retrofit pumps are not for power windows. Unknown if they discontinued 6v for Packard or just make them to order.

For window operation, Packard needed 275 psi for quarter windows so unknown if the retrofit pump has that much pressure. No idea what just the convertible part needs but that could be one reason they say no windows. Another likely reason they say no is fluid capacity. Convertibles have a small amount of fluid in reserve since what is in the cylinder on one side of the piston is expelled and recycled as the top is moved. Window and seat operation requires a large reservoir capacity to store the total amount of fluid in the window and seat cylinders when all are relaxed. The horizontal pump has extra capacity of just a few ounces over what the top cylinders require.

If the pumps have sufficient pressure out then it might be possible to rig some kind of additional reservoir tank and operate windows. The pump rotors are submerged in the fluid within the reservoir so don't draw from any height or distance. It would take a bit of ingenuity to plumb and mount the tank so the pump could use the fluid out of the tank but might be interesting to see if it could be done.

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