Power Steering Pumps
Chrysler only used
two basic styles of pumps - the Chrysler/Federal series and the Saginaw
| Here are some photos
of the three Pumps that were available at different times. The common Chrysler/Federal
pump is on the left. The Federal style pumps are also referred to as the
1.06ci pump, for their displacement. Although displacement
is greater than the Saginaw, it uses a two-stage flow control valve. At
low speeds, fluid travels through two orifices, allowing 2.7gpm to the
gear. At speed increases, a valve moves, covering one orifice and cutting
flow down to 1.6gpm. This improves steering at low speeds, while improving
feel at higher speeds.
The Saginaw pumps are
referred to as the .94 pump. This pump has less displacement, and only
offers single stage flow control. Both styles of pumps
regulate pressure with shims and a pressure relief spring. You can alter
the pressures by altering the number of shims in the flow control valves.
The Federal pump must be dis-assembled and the valve is on the back of
the pump body itself. The Saginaw pump contains the valve in the pressure
hose fitting on the back of the reservior. In addition, a larger
pulley will slow the pump, helping with the poor feel of the power units. These are the basic pumps.
There are slight variations in pump models depending on the engine/chassis...input
shaft location can be different and most pumps have different return line
Given the features, and
pressures from the chart to the right, it could be said that the best road
feel would be had with an A or E body Federal style pump. Not only does
it have the lowest output pressure, but the Federal's two-stage valve would
help things as well. Adding a bigger pulley would help further. Another
big boost in road feel comes from using an aftermarket 14" steering wheel.
The smaller wheel raises resistance and increases feedback quite a bit. Changing shims would
also provide more or less power assist to "customize" the feel.
OEM pressures are as
V,L - Valiant/Dart........................................0.94
1.06 pump 950-1050psi
B,J - Barracuda/Challenger.........................0.94
1.06 pump 950-1050psi
R,W - Satellite/Belvedere/Coronet..../6.....1.06
V-8..1.06 pump 1150-1300psi
0.94 pump 1200-1300psi
P,D - Fury/Polara/Monaco......smallblock....0.94
bigblock.......1.06 pump 1150-1300psi
C,Y - Newport/New Yorker/Imperial/300....1.06
These brackets were purchased
from Paddock. They're advertised as
OEM replacements to fit Saginaw 69-71 Pumps only. They actually fit any Saginaw pump with some creative grinding....
Here they are holding
the early Saginaw to an MP alum. housing.
The pics below show
the brackets on their intended pump. In the back, you can see the two mounting
studs and the
central location of the
|| The photo on the
left shows the brackets on the early Saginaw. The early pump
only has an upper mounting stud, so the lower leg is simply not
used. The problem is that the return tube is directly in the way of that
leg. You could just cut that leg off, but I chose to just clearance-grind
it in case I ever wanted to switch to the late Saginaw pump.
The front side of the
pumps have the same mounting pattern, so that side is a direct bolt-on
for either pump. Notice the orientation
of the pump on the brackets. The early pump tilts
farther out, taking up most of the space toward the battery. This early
pump usually has a big pulley on it, so it would help with road feel right
out of the junkyard, but it also takes up the most space under the hood. Also, as you can see,
common brass propane fittings from the hardware store can be brazed to
the steel line, allowing you to adapt to AN lines for custom hoses. As
far as I know, the angle of the flare is the same. Regardless, I can attest
that they definitely dont leak.
|| Here's a pic of the
Federal pump and its brackets. It's a whole different
arrangement from the Saginaw, but the pump is located closer to the water
pump, providing extra clearance on the battery side. Not only is this setup
the best from a performance standpoint, but it's the smallest arrangement
and is the nicest looking of the three options.
It's not shown here, but
there is one bolt hole on the back of the pump body which matches a tab
on the back side of the mounting bracket.
The hole can be seen
in the pics above.
One other note on the
Federal pump...The Saginaw brackets are commonly available from resto houses,
but the Federal brackets dont seem to be very popular. You may be forced
to find junkyard brackets for this pump.