power steering pump

ABS Power Brake, in CA. [You must be registered and logged in to see this link.] They have been really great to deal with.

Mike

Looka' what I found...

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944 / 968 Power Steering Pump Seal Kit #944-PSPSK
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(Here the kit is for even less @ Rennbay...)

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944 / 968 Power Steering Pump Seal Kit #[PUMPSEAL944]
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May be da , may be da ...

[ Fab a bracket, drill a pulley, and...BAM!!!
Cheap pump, pressures match, etc., ...]

Hmmmm....

I dissected the stock 944 pump early today. First thing I thought is "they charge 200+ dollars for this thing?!"
I figured about 3-4 dollars in O-rings and the batman shaped O-rings can be handmade also BTW. But the real kicker of the whole idea is that the stock 944 crank pulley bell can be welded to the stock 944 pump pulley and it matches the 5-groove Chevy serpentine.....

I do have a dumb question.....Looking at the front of the pump, which way does the pulley rotate on the 944 engine CW or CCW?
Would affect placement options.

xschop wrote:...But the real kicker of the whole idea is that the stock 944 crank pulley bell can be welded to the stock 944 pump pulley and it matches the 5-groove Chevy serpentine....
I do have a dumb question...Looking at the front of the pump, which way does the pulley rotate on the 944 engine CW or CCW?

25 Years, and it was this easy?

Belt rotation is clockwise [from Porsche manual]...

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[ Looks like... ! ]

87-944S wrote:ABS Power Brake, in CA. [You must be registered and logged in to see this link.] They have been really great to deal with.

Mike

Which master cylinder did you use? They seem to only carry GM stuff. Does one model bolt up to our car?

I'm using 10-56-9, link to the kit [You must be registered and logged in to see this link.]

It's a big honking M/C, it came in today. Polished aluminum, nice under hood bling I had them supply it with a shaft long enough to reach the Porsche pedal, with a 10mm heim joint for connection to the pedal. I did some test fitting tonight, it should work out well. I won't know if I will need to add a bias valve for front to rear bias until I get it all squared away and can drive the car. Hopefully I'll have in installed real soon.

Mike

Update for everyone

Ok here is the path we are going down.

PS changed out to a Turn one unit and yes I spent a few extra dollars on the nice pulley, $225 + $60
Steering rack replaced with rebuild one. added in PS filter and new boots.
Rack $320 from Zims [You must be registered and logged in to see this link.]
inline transmission filter from Filter Kit, Inline filter Magnefine 3/8 lines $20.95 M010CBK


We are also putting in a Hydroboost. Using a unit from 99 Ford Mustang.
Eric has made the mounting plate
The 944 MC tank fits the Ford MC (update, fits but does not handle the pressure, oops)
The 944 lines fitting fit the Ford MC
The Ford HB brake pedal shaft works off a ball joint which gives some leeway in the alignment
Eric welded on a threaded shaft to the Ford unit to fit the 944 brake clasp
We moved the coil packs to the strut tower to make room, to tight a fit.
So far it looks like a good fit

We will be posting pictures soon, Hopefully this week, we have tried to document this from the get go to help others.

Let me summarize, I take pictures and hang out under the dash and Eric does all the hard work. Though he let me use the electric grinder, but he made me redo my work.

Finally got the numbers right to stick the stock 944 PS pump between the block and frame rail. Depending on how low budget you want to go, you can weld the 944 5-grove crankshaft serp belt pulley right to the 944 PS pulley and fire it up. I'm doing a 1-piece billet pulley and curious if anyone would have a good idea on the conversion diameter calculation? I dont have the opposite pulley from the 944 to calculate the difference.

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I am going to make a cut to fit the stock 944 PS pump to the bracket tomorrow night, Then I can figure the pulley offset for the custom billet one I will make. And I will also post how to mod the stock 944 pulley easily by welding the 944 v-belt pully to the 944 crank pulley that is 5-groove and matches the serpentine belt of the LS engines....
Since no-one answered my last reply, I will just make the Pully Diameter the same as the stock 944 PS pump pulley Dia. when I do them from billet.
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The finish diameter of the billet pulley if needed should match the ratio of the 944

Ratio of the 944 system = pump pulley diameter (X) divided by crank pulley (Z) = ratio 1

X / Z= r1

Ratio error correction we need to know the ls1 crank pulley diameter expressed in L

New ratio for correction is

X / L =r2

X for ratio 2 can be replaced with X2 (possible pulley from 944)

r1 / r2 = correction factor

If the ratios are within about 3-5% of each other there will be no need for a billet pulley. Over around 8% bad things could happen, but no worse than running the LS1 pump against the 944 rack.

corrected some verbage to be more clear / accurate

I set it up on the block and Bling Bling. I have seen a few pulleys that are 5 grooved and 5.25 Diameter off the shelf.
I am hunting down a pulley that can be bought off the shelf and modified for the Porsche 3-bolt PS shaft pattern. Getting the offset correct is the kicker. It's storming outside and I'm done for the night

For reference for the DIY crew before I make the final cut. The 944 PS pump exit tube is on bottom and the high pressure outlet exits the frame rail side beautifully. Here's what the bracket should be cut to look like if you are making yours out of steel plate. I think 1/4 mild steel plate with 1/2" worth of washers and you've got yourself a nice inexpensive bracket that will make Renegade go back to the drawing board with their tails tucked
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????????
Nobody has one laying around?

Just for info... if the bracket is mounted in the upper location, the max dia. pulley you can put on is 4.5" which is the stock 944 PS pulley Dia. The frame rail is the limiting factor....

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If you mount it on the bottom, a whopping 8.5" pulley can be installed no problem. frame rail also limiting factor.....FYI

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With the 3/4" thick bracket, a 0.94" spacer is needed to mount the 5.5" diameter 944 6-grove belt pulley right to the 944 PS face.

You, Sir, are a very crafty man! I need to get a list of your fabrications.

Lets see, by my count..

PS bracket
Uprights
BH adapter
Big brakes
Motor Mounts

Wasnt there a bumpsteer, spindle that you came up with also?

You need to get all of your creations listed in one place so that those of us that are about to begin can just send our shopping list to you!

Thanks for all you work!

Ted

Now if I can only get a small keg cooler in the back

Seriously, I am rethinking the Alternator location now that I see how much room is on the driver's side. The Dims I posted for the Alt. bracket on the passenger's side work like a charm with .94" spacers between the bracket and passenger head, but the headlight motor is in the way when the truck alt. is brought out to match the truck crank 6 groove. If I can make it work. I will design a 1-piece bracket to put the inexpensive truck alternator and 944 PS pump both on the driver's side. I am going to figure a way to flip the tensioner upside-down and make it work.

xschop wrote:...Nobody has one laying around?

944 PS V-belt / crank "drive" pulley (fairly rusted...) O.D. = ~108 MM (4.25")

Strange because the PS pulley is 4.25"

If that is the case, it is a 1:1 ratio
The 5.3l 6 groove crank pulley is 7.625" diameter.
Meaning the PS pump has to be located on the bottom driver's to allow a 7.625" pulley on it to match the ratio.....

xschop wrote:100% ?

I found a 7" 6 groove that can be modded, not sure what the hell it came off of tho.....old S10 swap perhaps.

On the 5.3l ....................the front Block face to the very middle of the 1st belt groove on the crank pulley is 121mm

Anyone care to mic their LS engines. I need this info to make the 1-piece bracket and pulley for the LS engines wanting to stick on the 944 Power steering pump and truck alternator.....
I imagine they may even be different between the 5.3l alloy blocks that cam out of different vehicles. I Don't Know. I placed a straight edge across the face of the pulley and mic'd to the block face then subtracted the pulley face to center of 1st groove of the accessory belt drive.
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Can anyone confirm these dims on their F-body or Vette pulleys?
When I get home I will double check the Truck dimension (timing cover to ? edge) and how it converts to the 121mm dim I posted for the block face to 1'st groove center on the accessory belt....

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I should be able to get this for you tomorrow. I have the engine covered up on the side of the house and it is storming today. Its supposed to clear tomorrow. I'll see if I can get a measurement from the block with all of the accesories hanging on it

Thanks Blue. I need to know the differences. Because I am finishing the 1-piece bracket that mounts the GM alternator and 944 PS pump on the driver's side. Either the Alternator bracket needs to be milled at the bracket or the bracket needs milling. For the PS pump there will be different pulley offsets for the 3 diff crank pulleys.

pulley face to block = 125.12
pulley face to center of first first acc groove = 21.82

125.12 - 21.82 = 103.30

let me know if you need any other measurement.