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Old 08-20-2012, 02:06 AM   #1
The-Dullahan
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Default Belt Layout, Cadillac bigblock engines.

So after careful review, I have found that the standardized method of Bigblock Caddy belts is as such, with the rear belt lining up with the AC and power steering and the forward belt being spaced enough to match up with the water pump and alternator. Seen below.



However, and this is most likely due to the various layouts this engine can have, such as difference between years/actual engines as well as what had a smog pump and what did not, my balancer and water pump pulleys are a bit different. the two grooves in my lower pulley I suspect must be closer together and my water pump ALSO has two grooves.

Thereby, I have found that I can attach everything with three belts if I do it in this fashion (with my crudely drawn green, red and blue lines representing three different belts)



The blue one is the same as the first photo, connecting AC and Power Steering. The red one is to connect the water pump to the balancer and the green is to connect the Alternator to the water pump.

Think it will work? Any insight or input would be greatly appreciated.
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Old 08-20-2012, 05:48 AM   #2
campagna
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How would you adjust / install the red belt.
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Old 08-20-2012, 10:38 AM   #3
The-Dullahan
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Quote:
Originally Posted by campagna View Post
How would you adjust / install the red belt.
This was my concern too. It would have to be the exact right size and installed in the same fashion one would install a Timing Chain, in this case by removing the water pump pulley and installing the belt, then bolting the pulley back on. I actually have an Oldsmobile engine that utilizes this procedure, as ridiculous as it sounds, which is what gave me the idea that it may work. Still rather iffy on the whole thing, so I have been scanning Ebay for other pulleys.
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Old 08-20-2012, 11:33 AM   #4
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I have used this set up several times, and it works very well. How ever, it does not work well with a high output alternator (too much drag). Just make sure you fit a second or back up belt to keep in the car, because if it breaks on the road, no one will have the proper belt in stock.


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Old 08-20-2012, 01:28 PM   #5
The-Dullahan
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Good to know. I will still look into the other belt setup. My engine swap still needs a transmission, rear end and a custom driveshaft anyhow. Actually, my alternator is a 650 amp HO one, to be honest. I will have to work something out for that. Perhaps switching to a larger pulley.
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Old 02-17-2013, 11:24 PM   #6
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I don't know if it would work since you have AC, but I just made some aluminum spacers to bump the power steering pump out to line up the next groove. Then, you only have 2 belts, and both are adjustable. One that goes around the crank/water pump/power steering pulleys, and one from the water pump to the alternator. I had run a belt like the red one in the drawing, you can install it by getting it most of the way on and cranking the motor over for a second, it'll jump right on
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Old 02-20-2013, 01:56 PM   #7
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GM actually sold a system like your red belt, for Chevrolet engines.

I'm thinking they called it a "Captured Belt" system. This was over-the-parts-counter only, never installed on a production-line engine; and for racing only.



First Guess: Your red belt should be extended to also drive an air pump, the air pump is pivoted to allow for belt tension adjustments.

What year/model are your pulleys from? Find belt routing diagrams from that year/model.
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