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Old 12-14-2008, 01:27 AM
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Default 57 Chev PS pump pressure, anybody know?

Anybody know the steering pump pressure for a stock 57 Chevy? I know C-3's are 1,000PSI, and Chevy trucks from that period were 1,500PSI. I ASSUME, since a 57 is controlled just like a C-3, it's 1,000PSI.
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Old 12-14-2008, 01:32 AM
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Originally Posted by big2bird View Post
Anybody know the steering pump pressure for a stock 57 Chevy? I know C-3's are 1,000PSI, and Chevy trucks from that period were 1,500PSI. I ASSUME, since a 57 is controlled just like a C-3, it's 1,000PSI.
Bird, I have no direct knowledge but from comments I have seen in the past, it's the same system, essentially....

maybe check with Jim Shea over 'there'....

OH, to edit....when I put the serpentine '88 vette pump on front of my then dead stock L38 engine, the entire pump valve was changed to the '72 design as I was told the pressures/flows were different somehow....I forget which....so I did and it worked fine for years....leaked like the all do, but nothing abnormal....

but with that valving difference in the pump right now....I really dunno why I am happy with the rack install I did some 5-6 years later, the road feel is fine IMO....against some other complaints....
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Last edited by mrvette; 12-14-2008 at 01:37 AM..
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Old 12-14-2008, 03:02 PM
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Does the 57 have the hydraulic cylinder assist like an early Corvette or a servo on the gear? Generally, I think the cylinder style take less pressure.

I have a GM Power Steering and Pump service manual from 1975. It has the following information:

Chevrolet (except Vega, Monza and Corvette), Buick (except Skyhawk), Oldsmobile (except Starfire) and Pontiac (except Astre): 1350-1450psi

Cadillac 1425-1475psi

Vega, Monza, Astre, Starfire and Skyhawk 750-850psi

10-20 Series Vans, Corvette 900-1000psi

10-20-30 C & K Series Trucks 1200-1300psi
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Old 12-14-2008, 03:06 PM
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Does the 57 have the hydraulic cylinder assist like an early Corvette or a servo on the gear? Generally, I think the cylinder style take less pressure.

I have a GM Power Steering and Pump service manual from 1975. It has the following information:

Chevrolet (except Vega, Monza and Corvette), Buick (except Skyhawk), Oldsmobile (except Starfire) and Pontiac (except Astre): 1350-1450psi

Cadillac 1425-1475psi

Vega, Monza, Astre, Starfire and Skyhawk 750-850psi

10-20 Series Vans, Corvette 900-1000psi

10-20-30 C & K Series Trucks 1200-1300psi
57 used the same valve/ram set up like the Vette. Yes, the C-3 steering dates back to 1955.
I ASSUME at this point like you, it's 1,000PSI.
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Old 12-14-2008, 05:56 PM
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Quote:
Originally Posted by BBShark View Post
Does the 57 have the hydraulic cylinder assist like an early Corvette or a servo on the gear? Generally, I think the cylinder style take less pressure.

I have a GM Power Steering and Pump service manual from 1975. It has the following information:

Chevrolet (except Vega, Monza and Corvette), Buick (except Skyhawk), Oldsmobile (except Starfire) and Pontiac (except Astre): 1350-1450psi

Cadillac 1425-1475psi

Vega, Monza, Astre, Starfire and Skyhawk 750-850psi

10-20 Series Vans, Corvette 900-1000psi

10-20-30 C & K Series Trucks 1200-1300psi
57 used the same valve/ram set up like the Vette. Yes, the C-3 steering dates back to 1955.
I ASSUME at this point like you, it's 1,000PSI.
So I have to assume that is what my '88 serp vette pump is doing, as I just replaced the valving with the OEM stuff out of my '72 pump, it also changed over to the flare fitting, instead of that O ring AN style.....

so keeping that OE '72 valving reduced the line pressures/whatever it did with flow, I dunno....but that's into both my HB and rack steering....
which most certainly was meant for higher pressures/flow?.....

maybe explain why I find the feel to be just fine on my car while other don't....

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