Another thing I can't seem to wrap my mind around. On SBC with original pulleys; I have a belt going from crankshaft to water pump to alternator to power steering AND another belt from crankshaft to water pump to A/C compressor. I find a lot of pictures showing this belt arrangement, but no detail or diagram showing which groove the belts are in. Question is - the crankshaft and water pump each have different size pulleys, so will there be some kind of slippage or do the different diameters compensate for this? Regards, Twobit ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
There will be no slippage, assuming that the groove configuration is the same. The pulley diameters control the rotational speed of the components. Think of them like the gears on your bike. The crank pulley is the "drive", just like the sprockets on your bike where you pedal. The accessories (water pump, p/s, etc) are the "driven" components, like the rear sprockets on your bike.
IF both grooves in the pulley on the crank have the same diameter And Both grooves in the pulley on the water pump have the same diameter THEN There will be no problems with slippage. ............................... The crank pulley diameter and the water pump pulley diameter can be different from each other The sizes of the pulleys determine the Rpms of the driven accessory In relation of the crank speed. A smaller driven pulley will increase the Rpms.
Thanks fsae; The two diameters on the crank are the same. The two diameters on the water pump are different. If the two on the crankshaft are driving the two on the waterpump, won't the driven pulleys want to go at different speeds?? Thanks again, Twobit ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If its OE it will work. Run a cut old belt over the pulleys an look to see they are in correct alignment. The OE stuff has been changed back and forth so much it's hard to know which belt goes on first. Two cents worth.
If I'm understanding you correctly .... Then yes you will have problems. Each grove on the water pump pulley will want to spin at a different speeds if both are tied to the same diameter crank grooves. And yea pics would help a lot
Then why does all the information I find show two belts running on the crank and water pump to A/C or alternator???? Looks like a good possibility that I have the wrong pulley on my fan. They will have to be the same size, right?? Looks like all pulleys on the same shaft would have to be EXACTLY 100% the same or something will have to slip. Thanks again, Twobit ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Good possibility you have a mismatched set of pulleys, or brackets or belt routing. If everything works the simplest solution Will be to find a different wp pulley. http://www.hotrodhotline.com/conten...-chevy-article-provided-alan-grove-components
Check the sheaves (the "pocket" where the belts sit on the pulleys). They should be the same for all the pulleys. Also misalignment will cause slippage. Vee belts allow for slight misalignment (typically < 1/4"). Also do you have sufficent tension on your belts?
I am just locating the accessories on the front of the block. Looking at the possibilities is what caused all the questions. The only thing I can imagine is that I somehow got a different water pump pulley on. I don't know how that would happen, but I will consider that is my problem, if I have one?????? Regards, Twobit ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
After pondering I think this is your problem right here. The alternator spins relatively fast compared to the p/s. This large difference in rotational speed will cause slippage. Try to seperate your accessories using a dual or triple groove crank pulley and the necessary spacers for the accessories to get your sheaves in alignment. Run your alternator this way: crank-water pump-alternator (all on one belt). Then your crank-p/s-a/c could be on another belt. Bottom line is to have your alternator on its own belt like I described. Good luck and let us know how it works out!
From Alan GROVE. SBC, SWP & LWP Here's the link, http://www.alangrovecomponents.com/Important_Info.htm
I ran into this problem years ago. Somehow I used a crank pulley with same sized pulleys with a water pump pulley with different size pulleys. After it would run a while, 10-15 minutes the belts would start squealing. I tried tightening them so tight they were tight as fiddle strings, still would squeal. Finally figured it out. With same size crank pulleys use same size water pump pulleys. With different size crank pulleys use the different size water pump pulleys. The size of the driven accessories didn't matter.
Let pump some life back into this thread with a new question. How impractical are these pulleys? Or are is there a good reason for them? I've not seen many setups like this, without a blower, so I'm thinking they are just for looks?
Well ,…… you don’t have to worry about belt slippage. But that’s a heck of a waste of money and space simply because ( to some) it looks cool .
Looks cool I guess,,,,,,,but spending 4-5 hundred for that setup is crazy,,,lol . Absolutely no advantage in performance,,,,,just looks alone . But,,then again,,,,the photo watermark does say Car Craft . Tommy
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