Archive for October, 2008

Power steering pump pulleys for your LS engine swap

Friday, October 17th, 2008

In the post below, you’ll find details about converting your attached power steering pump reservoir to a remote reservoir. Right now, let’s talk about one more part that may help solve clearance issues–the power steering pump pulley.

GM is almost as bad as Ford about making changes and having dozens of different part numbers for the same basic part. In the case of PS pump pulleys, having some variation is a good thing.

So far, we’ve found 6-groove serpentine pulley diameters from about 5.25″ to 6.625″. This difference will change the RPM of the pump relative to the engine RPM but for most street applications, you probably won’t register much difference in actual steering feel.

In the photo below, you’ll see one other important difference besides the diameter. Notice that the smaller pulley has access holes while the larger one does not. When selecting a pulley, we really recommend finding one with the holes. Otherwise, any time you want to install or remove the pump, you’ll have to pull the pulley to get to the bolts that mount the pump. That’s not a super big deal if you have the right puller and the right installer tool. But, with most engine swap projects, you’re likely to be installing and removing components several times during your build and then pulling and pressing on a pulley becomes a pain in the butt.

Saginaw Type II power steering pump pulley

And just one more point: As usual, Corvette parts have to be a little different. In this case, the shaft diameter of most Corvette pumps is .66″. All other Type II (or TC) pumps including Camaros, Firebirds, and most other GM passenger cars are .75″ diameter. So, choose your pump pulley accordingly.

Thursday, October 16th, 2008

Power steering pump modifications for your LS engine swap

Wednesday, October 15th, 2008

Here’s how to convert a Saginaw Type II (or TC) power steering pump from an attached reservoir to a remote reservoir.

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This conversion may be necessary if you’re using our Kwik Performance driver’s side bracket kit. Why do you need our bracket kit at all? Most likely for three reasons:

1. You have a Camaro, Firebird, or GTO engine with the alternator down low and the power steering pump up top. Your LS1 or LS6 engine swap project may have clearance issues with a steering box or you may not like the idea of power steering fluid leaking down and frying your alternator. The Kwik kit puts the alternator up top and the pump down low–like the Corvette position.

2. You have a truck/SUV engine and the alternator is too high, maybe causing hood clearance issues.

3. You have an LS1, LS2, LS6, LS7 or other crate engine or a swap meet engine with no brackets at all. You can run our driver’s side bracket by itself or you can team it up with our air conditioning compressor re-location bracket kit. Either one works alone or in tandem.

If you’re using a F-body engine and you have the original power steering pump, all you have to do is remove the plastic reservoir by driving off two spring clips and giving the reservoir a good tug. You’ll see a plastic sleeve that may come off with the reservoir or may stay in the pump. The sleeve may also have an o-ring. Pull out the sleeve and you’ll be ready for the instructions below.

If you’re using a truck or SUV engine, 4.8, 5.3 or 6.0, you’ll most likely have a Type I (or P) style pump. This is the older Saginaw pump design with an attached metal reservoir. In this case, you have to track down a Type II or TC pump. Almost any GM car from the late ’80s on will be a donor candidate.

Here’s one from a Pontiac Montana van for example:

Saginaw TC power steering pump

And here’s one that looks completely different because of the attached plastic reservoir but the pump body is identical. This one is from a 2005 GMC Envoy (same as Chevy Trailblazer).

Type II power steering pump

You can also find good deals on reman units at your local parts store. For example, if you ask for a pump for a 1990 Chevy Celebrity with a 2.5L engine, your local NAPA store will probably charge you around $65 plus a $5 core charge. If you ask for a 2000 Cavalier, you’ll get what appears to be the same pump but you’ll pay about $75 plus a $55 core charge. I’m sure there are minor pressure and output differences but not enough to matter in most street driven vehicles.

Oh, and there’s usually a supplier or two on eBay offering reman units for even less and with no core charge. (Usual disclaimer about checking feedback ratings, etc. before doing business with eBay members).

OK, here’s one way to set up a remote reservoir. We’re going to use factory GM parts from a late Corvette. If you want to buy them new, here are the GM part numbers:

Reservoir 26046502
Bracket 12555222
Return tube 26006074

The photos below show how to install the return tube. When you first look at the return opening on the pump, the place where the reservoir used to connect, you may think that the new return tube you just paid about $30 for, won’t fit. That’s because the hole in the pump has a step. The outer diameter is about .75′ and the inner, stepped diameter is the .625″ that matches the new return tube.

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The return tube will be a press fit. The simplest way I found to do the job is to lube up the end of the tube, hold it in place, slide a 5/8″ open end wrench over the tube just above one of the beads, and then tap gently on the wrench with a hammer. Keep moving the wrench around the tube as you hammer to keep the tube going in straight.

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Next, bolt on the GM bracket using the two upper/inner bolts than hold the Kwik bracket to the cylinder head. After that, just slide the reservoir down over the spring tabs on the bracket.

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Here’s what it looks like with the reservoir in place.

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Now, you’ll see two tubes sticking out the bottom of the reservoir. One is a small tube where the fluid returns to the reservoir from the steering box. The other is a larger, 5/8″ tube that points down and back. Here’s where you attach a feed hose from the reservoir down to the pump. This is a non-pressure hose but does need to be an oil-resistant type of hose (no heater hose here).

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OK, that one way to do it. A second way, slightly more complicated, we’ll cover in a later post. The second way involves tapping the power steering pump for a threaded fitting so you can run stainless braided hose or other hydraulic hose with threaded fittings.

And, if you’re working with a larger budget, a third way is to source an aftermarket pump that’s already equipped with a threaded fitting. These pumps are often used in racing or off-road applications. Check Summit Racing or Jeg’s for more info.

How to put a Sanden AC compressor on your Big Block Chevy

Thursday, October 9th, 2008

We’ve sold a bunch of the adapter plates that let you mount small block Chevy serpentine brackets on the front of a big block.  It’s an easy and inexpensive way to update to the latest alternator and use a single serpentine belt.

Some people don’t really care for the GM rotary air conditioning compressor, however.  So here’s how you can replace it with the most popular aftermarket compressor–the Sanden 508.

For some reason, the most common multi-groove pulley, the one that Vintage Air and others sell, is a 7-groove, while the GM belt is a 6-groove.  No matter, with what I’m about to share, you simply use the rear 6 grooves and leave the front one empty.

The Sanden has two sets of four mounting ears, 1 set at the front, 1 set at the rear.  To start, simply place one of the front ears just behind the inner hole on the GM bracket.  Temporarily stick a longer bolt in the matching rear hole.  You’ll see that you’ll need a short spacer or even just a stack of washers to connect the rear holes.

Then make a short “link” to connect the outer holes of the compressor and the bracket.  I used 3/8″ material.  The length of this link can vary depending on how much valve cover clearance you need.  I was able to keep the center of the compressor shaft in approximately the same location as the GM compressor.  You’ll see that you will also need a short tube spacer to connect the link to the bracket.  You could make a matching rear link but just the one seems really sturdy.

This mounting system puts the Sanden at a 45 degree angle from it’s normal position.  The Sanden website says 45 degrees is acceptable and maintains the inner lubrication.

Sanden AC compressorHere’s an overview.  You’ll notice that in this case, the small block brackets are actually still on a small block.  But you get the idea.

Sanden mount

Here are the inner ears.  The front one (to your left) is a direct mount.  The rear one requires a short tube spacer.

Sanden mount

Notice that the connecting link also needs a short tube spacer to connect the outer ear of the Sanden to the outer hole on the GM bracket.