Power Steering Box - Impala Tech
 
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post #1 of 7 (permalink) Old 08-05-2016, 04:24 PM Thread Starter
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Power Steering Box

Anybody know the difference between a 600 box and a 605 box? I believe but am not sure that the 600 is variable ratio while the 605 may be a less expensive version w/o the variable factor but not sure. Can anybody shed some light on it?? Thanks!!
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post #2 of 7 (permalink) Old 08-05-2016, 07:44 PM
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The 605 is a Delphi part (it is actually a registered trade mark and addresses only one box) and is all brand new made out of billet aluminum. Read this article:

1968 Chevy Chevelle CPP Saginaw Steering Box - Popular Hot Rodding Magazine

Here is info on the cast iron production version:

GM Delphi 600 Integral Power Steering Gearboxes - Street Rodder Magazine

Saginaw; Delphi-Saginaw; Borgeson; and Bendix all sell power steering gear boxes that have been used by the big three and are interchangeable as far as bolting to the frame goes (most use three out of the four mounting bolts ). There are four different cases for the Saginaw 600 series: depending upon the application (both gross vehicle weight, turning radius and vehicle type [Jeep, Ford, GM] have different cases); with parts that function along the same design plan, but that doesn't mean the internals interchange at all. Steering gearboxes are not hand grenades: close doesn't count. There are differences in the hose fitting (size and means of sealing the hose), pitman arm spline count on the sector arm, and internal stops that determines the turning radius, ratio of the gears inside and whether it is a constant or variable flow of hydraulic fluid to offer a faster response.

Strongly suggest you buy a complete kit to crawling a junk yard looking for cheaper parts that can be rebuilt; but may not match what you want.

Big Dave
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post #3 of 7 (permalink) Old 08-06-2016, 03:19 PM Thread Starter
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Once again, THANKS for the info. Man, you're a walking book of knowledge!!!
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post #4 of 7 (permalink) Old 08-06-2016, 03:32 PM Thread Starter
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OK, I've looked at the pictures and it brings up yet another question: Why would you need a pulley on the PS pump with 2 grooves? Seems to me it should only require one, using a small belt to the crank pulley and nowhere else. Even with AC I don't see why the second groove is necessary? What am I missing?? Thanks again!
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post #5 of 7 (permalink) Old 08-06-2016, 10:22 PM
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According to Gates V-belt design criteria the max horsepower per 3V series belt is 7.01 at 3,450 RPM. Go faster under load and the belt will suffer.

A GM power steering hydraulic pump draws three to five horsepower depending upon load and RPM. Doing more research and actual dyno comparisons rate it at 6.6 horsepower to spin pump on a Mopar. Ford had the same numbers as the GM pump.

Because a car can rev beyond the 1917 designed RPM limits placed on a V-belt more than one belt is required for safety. That is why GM used dual pulleys on power steering pumps on all medium to full size cars (lighter car has less load on the pump so it can use a single groove pulley).

Big Dave

Last edited by Big Dave; 08-06-2016 at 10:39 PM.
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post #6 of 7 (permalink) Old 08-07-2016, 01:41 PM Thread Starter
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Wow is that interesting. I can't remember seeing two belts on a PS pump before but obviously it's done. So with that in mind, you would need a 4 groove pulley on the crank if you have a/c and a dual on the water pump? Maybe using a single groove on the PS pump is why you hear them squeal once in awhile!
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post #7 of 7 (permalink) Old 08-07-2016, 11:45 PM
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A/C pulls right at seven horsepower, but only a Chevy uses a single groove sheave (Which is good because if you over speed a A/C compressor you burn out the front seal) so a slipping belt saves you money. That is why even old Corvettes had an RPM disconnect based upon the digital ignition box used by Corvettes starting in the early seventies to turn the A/C off. All of the other GM cars that use the same compressor have two grooves for V-belts and three belts on the water pump.

The water pump is a mini dyno. It sucks up more and more power the faster you turn it. This is why a Stewart water pump is such an improvement over the stock. It uses a CNC carved enclosed impeller (looks like a turbo wheel in the housing) instead of the open paddle wheel that the stock pump uses with flat bent blades.

I always go to the junk yard and buy the serpentine front drive brackets off of a 305 motor replacing the idler and water pump to use a flat serpentine belt over a V-belt. A seven to nine rib can handle a small blower such as a Vortec centripetal blower.

Only Gates still makes a V-belt (Goodyear dropped them eight years ago). None of the other US manufactures even bother any more as they are considered only useful for lawn mowers and washing machines. The only place high horse belts are used to day is in machine equipment such as air compressors and mills, material transport ,and ventilation. They are all in the ten to a thousand horsepower range and won't fit on a car (there are a bunch of different sized belts and a car uses the smallest size called a 3V). Won't be long before you won't be able to buy a good V-belt any more.

Big Dave
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