Size, girth, and depth. :p Who'd-a-thunk? :cool:

SIZE - - - - - -
Are the pulleys one-size-fits-all?

I have a Sagainaw box that I'm preparing to strap to my motor-swap, and I've pulled the V-belt pulley off of it. I'd like to head out to the junkyard with my puller and grab a coupla different sizes of 6-rib serpentine pulleys -- is the inner diameter of the pulleys the same, where they press onto the steering shaft?

GIRTH - - - - - -
Any thoughts on how small a pulley can be run before the belt starts to slip? A smaller pulley will turn the pump faster, but a larger pulley has better belt engagement.

DEPTH - - - - - -
Also, can I fine-tune belt position by pressing the pulley on or off (i.e. forward or backward on the pump shaft) by differing degrees? That sure would give me some freedom in bracket fabrication...

BACKGROUND
I'm swapping a Ford 302 into a pretty small engine compartment, so I'm using custom brackets to allow me to run all the normal EEC-IV smog stuff, including the smog pump, but I'm also planning to run two alternators, an AC compressor, and a PS pump. That's a whole lotta accessories in very little space... and I'm still trying to figure out where to stuff a second AC compressor! :D

Randii

:D Pumped up the subject line for more responses... I can't believe that NOBODY has an opinion on this?

I swapped in a 5.0L into my Jeep & also converted to a saginaw pump. Pulled off the V groove & used a serpentine from a Chevy something.

The pulley was in a crate & I just had to pick & choose. Take the pump with you to the wrecker and dig through what they have.

After the whole motor is together you'll have to experiment with belt lengths.

The pulley should be pressed on so it's flush with the shaft, there's typically a special tool set for this that helps with the positioning. I would not play with the pulley position in regards to alignment...leave that to your bracket.

As for all the accesories your running...two alternators? Just get a single high amp output. Two AC compressors...I wouldn't even put one on...by the time you get all this stuff bolted on & squeezed in, your 302 isn't going to have enough power to operate all that stuff at an idle during all the crawling around.

The pulley should be pressed on so it's flush with the shaft, there's typically a special tool set for this that helps with the positioning. I would not play with the pulley position in regards to alignment...leave that to your bracket.
Yeah, that's probably the best way to do that. Shim stock is easy enough, I guess, I'll just build it a little short.

As for all the accesories your running...two alternators? Just get a single high amp output.
I like redundancy, especially with all the electrics I run. Besides the alternators I have are paid for, and were CHEAP.

Two AC compressors...I wouldn't even put one on...
Roll up the windows and blast the AC -- an open-top Jeep thing, you just don't understand. :p AC and onboard air -- easy enough to stuff them down by the oil pan, and my short engine compartment pretty much require repackaging all the accessories anyway.

...by the time you get all this stuff bolted on & squeezed in, your 302 isn't going to have enough power to operate all that stuff at an idle during all the crawling around.
I'm not all that worried, coming from a 4-banger, I'm running 210:1 and 20 forward speeds. I think I can find a gear that will work for any occasion... also, keep in mind that the compressors don't pull any resistance unless you switch the clutch in.

Randii

I swapped a saginaw pump from a 78 or 79 F250 into my bronco after the second or third time the POS ford pump died.

I grabbed it off the same motor ( Pig Iron 351M) so it was easty to bolt up, but it was (IIRC) a 6 rib, for her pleasure :grinpimp:

Since I didn't remove the pulley it could have been key shaft not press fit shaft though.

edit. I think I'm confusing my broncos... I put this on a 351w with a serp belt, but it was still easy to bolt on.

YMMV,

- Dan

Thanks, Dan -- I'll check out the baby big-blocks, as well.

It wouldn't be a huge deal to buy another pump if it had the right pulley attached... junkyard prices. :p

Randii

Randy:
I wish to put a Saginaw pump on my Rover... How are you getting the pulley off? Do you have one of those nifty (expensive) tools?

The pulley on the boneyard pump I have is too narrow and I'll need to get one wider to match my serpentine belt.

Paul

How are you getting the pulley off? Do you have one of those nifty (expensive) tools?
Mine was under $20 from Harbor Freight. I'm not sure how to get the pulley off without a puller -- they are on there TIGHT! :eek:

Randii

I just made a V-groove pulley for my SBC with a steel center, 25% overdriven (faster). I think all Saginaws are .750" and take about .001" press. As for seating it all the way in, well the less you have pressed on the less you have holding it on.

If it starts to slip, tighten up the belt :D

The reason I had to make a new pulley was because I didn't have the right puller, and none of the P&P have any good pulleys left. That and a new one from the stealership was close to $40!

I also took the opportunity to make a quart and a half resivoir/cooler for the power steering. :D

Verification -- all saginaw pumps do seem to use the same shaft OD. I pulled three pulleys at the junkyard today to check, and now have a nice assortment of pulleys to use... $5 apiece. :D

I'm hoping to use the one off the Pontiac Firebird... I don't have any Pontiac in my mongrel yet. :p

Randii

why over drive the PS pump? with a saginaw pump you're not gaining any pressure or that much flow.

why over drive the PS pump?
I'll be running a stock pulley, so I'm not sure.

Based on disassembling and cleaning the pump that I have, I, too, question the benefits of overdriving it. You'd need a smaller pulley, which means less belt contact, and the pressure valve is still going to be the limiter (there's a peak flow and pressure).

The only advantage to overdriving that I can see is that you get better pressure at idle...

Randii

Originally posted by randii
Verification -- all saginaw pumps do seem to use the same shaft OD.

Geez... gotta contradict this general statement... I found that MOST Saginaw pumps use the same shaft diameter, but I also found that the smaller boxes have exceptions. :( My TC pump uses the same shaft as a P-pump, but I dounf several TC-style pumps in the junkyard that do not. Apparenty Saginaw just wants to keep us guessing...

Sorry to over-generalize.

Randii