| From | Message |
ckcarson
Dodge Dakota
6/17/2001
11:13:40
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 Subject: short belts
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Message:
Does anyone know the length of the belt needed to go around the water pump,idler,alt,adj only.genII 5.2,auto.
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Jeff
Dodge Dakota
6/17/2001
15:23:15
| RE: short belts
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Message:
Good question, and I have one to add. If you do use the short belt, it will be about half as long as the original. Wouldn't this make your water pump and alt spin too fast? I didnt want to chance it so went with the a/c bypass only.
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Daniel D
Dodge Dakota
6/17/2001
16:30:00
| RE: short belts
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Message:
go to auto zone and ask for belt number 522k6, the belt is 52.2 inches long, i used it until i got my underdrive pulley, do now i have a 49.5 inch belt, you have to use the 6 rib because they don't make that length in a 7 rib. use the grooves closest to the engine,
Daniel D
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CHUCK
Dodge Dakota
6/17/2001
23:33:32
|  RE: short belts
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Message:
Jeff,
I'm pretty sure accessory speed is a function of pulley diameter rather than belt length. Eliminating an accessory such as the A/C from the belt path reduces the parasitic HP loss but the remaining parts still spin at the same speed relative to the crank. Did I understand the question?
Chuck
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Jeff
Dodge Dakota
6/18/2001
00:24:21
| RE: short belts
IP: Logged
Message:
yeah, thats true, IF you have the same size belt. but, look at it this way. as you know, the crank pulley is always going to turn at the same speed, short or long belt. say the circumference of the pulley is 2 feet (i have no idea, just a guess), and a standard belt is 8ft (again, a guess). the pulley would have to turn 4 times for the belt to make 1 complete revolution. with the short belt, we'll say 4ft, the pulley would have to turn twice for the belt to make it around once. with the same crank pulley for the two belts, you are doubling your accessory speed. seems like that would cause problems, especially with a supercharger. a 20# boost would not be good on these engines.
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Chuck
Dodge Dakota
6/18/2001
07:00:32
| RE: short belts
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Message:
But Jeff,
you HAVN'T doubled the belt's speed in your example. What you did instead was to halve the belts length right? So now it takes the belt half as long to make the trip but only because the trip is half as long, not because it's going twice as fast. Remember you said the crank pully's going the same speed and that's the key. here's another example; a one foot CIRCUMFERENCE crank pulley turning at 100 rpm driving a belt of any length will move the belt at a speed of 100 feet/min right? Now figure a water pump pully with a 6" circumference, the pump speed will be 200 rpm regardless of the belt's length.
Hope I helped
Chuck
Chuck
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Chuck
Dodge Dakota
6/18/2001
07:01:43
| RE: short belts
IP: Logged
Message:
But Jeff,
you HAVN'T doubled the belt's speed in your example. What you did instead was to halve the belts length right? So now it takes the belt half as long to make the trip but only because the trip is half as long, not because it's going twice as fast. Remember you said the crank pully's going the same speed and that's the key. here's another example; a one foot CIRCUMFERENCE crank pulley turning at 100 rpm driving a belt of any length will move the belt at a speed of 100 feet/min right? Now figure a water pump pully with a 6" circumference, the pump speed will be 200 rpm regardless of the belt's length.
Hope I helped
Chuck
Chuck
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Chuck
Dodge Dakota
6/18/2001
07:02:25
| RE: short belts
IP: Logged
Message:
But Jeff,
you HAVN'T doubled the belt's speed in your example. What you did instead was to halve the belts length right? So now it takes the belt half as long to make the trip but only because the trip is half as long, not because it's going twice as fast. Remember you said the crank pully's going the same speed and that's the key. here's another example; a one foot CIRCUMFERENCE crank pulley turning at 100 rpm driving a belt of any length will move the belt at a speed of 100 feet/min right? Now figure a water pump pully with a 6" circumference, the pump speed will be 200 rpm regardless of the belt's length.
Hope I helped
Chuck
Chuck
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Chuck
Dodge Dakota
6/18/2001
07:49:20
|  RE: short belts
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Message:
OOPS....well I never got the post confirmation page, sorry 'bout that and I'll now better next time!
Chuck
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Jeff
Dodge Dakota
6/18/2001
15:39:17
| RE: short belts
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Message:
maybe i'm thinking too much for my own good. i'll grab a beer and put a stop to that.
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Chuck
Dodge Dakota
6/18/2001
15:52:34
|  RE: short belts
IP: Logged
Message:
Shiner Bock always works best for me!
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