dimming issue

[MikeyB 5,000+ posts]

So in reality, if the pulley is smaller than the stock one, and you want to get the full performance out of the alt, you will have to buy a shorter belt. Plain and simple. Doesnt mean it wont work, you just wont get the same amount of current out of the alt.

 

[SPL140.2 5,000+ posts]

So in reality, if the pulley is smaller than the stock one, and you want to get the full performance out of the alt, you will have to buy a shorter belt. Plain and simple. Doesnt mean it wont work, you just wont get the same amount of current out of the alt.

X2

 

[BloWNMind 10+ year member]

^^^^//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif thats like saying your with your friend riding bikes, one has a 10 speed with big tires and you riding a regular size bike with smaller tires. If your both riding at the same speed or rpm, the smaller tires are rotating more and faster than the larger tires on the 10 speed //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Same thing applies to belts //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif But what do I know //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif
egg

^^^ I dont think he is really picturing it like he should. The point is a shorter belt wont have to travel as far to spin the alternator as much as a longer belt would have to. Might have to draw a picture or something to show it better.
Its the exact same concept as SPL140 said, a bigger tire doesnt have to spin as far as a little tire does to make you go the same distance. Its the exact same thing with the length of the belt.

A longer belt would have to travel further to make one complete rotation compared to a shorter belt.

/thread

It doesn't matter if the belt is 1 mile long. The rpms of the alternator are directly proportional to the size of crank pulley, the size of the alternator pulley, and the rpms of the engine. Put aside slipping for a moment, think of the belt as a bike chain, the crank pulley will rotate (x) amount and will move the chain x amount times the cranks size/ratio=, the chain then moves y amount over the alt pulley rotating the pulley y amount divided by its size/ratio=alt rpms. It doesn't matter how many rotations the belt makes, what matters is that any movement of the belt transfers to adjoining pulleys. Sure a smaller belt can help with slipping but it will not make anything faster.

 

[SPL140.2 5,000+ posts]

It doesn't matter if the belt is 1 mile long. The rpms of the alternator are directly proportional to the size of crank pulley, the size of the alternator pulley, and the rpms of the engine. Put aside slipping for a moment, think of the belt as a bike chain, the crank pulley will rotate (x) amount and will move the chain x amount times the cranks size/ratio=, the chain then moves y amount over the alt pulley rotating the pulley y amount divided by its size/ratio=alt rpms. It doesn't matter how many rotations the belt makes, what matters is that any movement of the belt transfers to adjoining pulleys. Sure a smaller belt can help with slipping but it will not make anything faster.

people still dont get it //content.invisioncic.com/y282845/emoticons/verymad.gif.3f39c5c2fd57527b671fad3efdfac756.gif that would be true if you kept the same pulleys and just changed the belt to a smaller one wouldnt make a difference at all except maybe less slipping. The Iraggi's come with smaller pulleys. What happens if you change one of those bikes pulley to a smaller one and change out the chain for a smaller one, you would have to pedal harder and the rpms of that pulley increase to be the same as the "stock". Same principal is applied to an alternators pulley and belt and vehicle. The vehicle has to work harder hence lower gas milage. This is why some people say there Iraggis or powermasters or other High Output alternators arnt working as they should because their only using 70-80% of the alternators potential. Not to mention not wiring it correctly or upgrading wires but thats another topic //content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

egg

 

[MikeyB 5,000+ posts]

I see where you train of thought is coming from, since the belt is actually pushing off of the crank pulley and pushing the alternator pulley around. This is actually a very tricky topic to discuss. But again, imo if you were to take anything with a big pulley and small pulley, and decreased the size of one of the pulleys, the belt, or chain, or whatever the driving mechanism might be, would have to be decreased also, to keep the same ratio throughout the system.

Its like saying when you put a smaller pulley on your stock alternator you can use the stock belt. Which is incorrect.

I could easily argue it both ways. Because if you think about it, the alternator pulley with spin at the exact moment that the crank will spin, when started.

I dunno I dont want to think about this anymore, Ill let someone else that has proof to argue it. Either way, when I put my Iraggi on I will be looking into getting a smaller belt, whether it helps with power or not, it will definately eliminate any possible slippage.

 

[dman4486 5,000+ posts]

i feel stupider just reading this last page...

 

[dman4486 5,000+ posts]

Its like saying when you put a smaller pulley on your stock alternator you can use the stock belt. Which is incorrect.

wrong

 

[dman4486 5,000+ posts]

the point of putting a shorter belt is to take the slack out that is created by smaller diameter pulley...and belt length will not help with slippage...tension does this

belt length affects slippage only when you have a 3 pulley system in which one pulley is closer to the centerline of the other two pulleys....ill post a pic...

 

[MikeyB 5,000+ posts]

Please do this is confusing the hell out of me

 

[MikeyB 5,000+ posts]

Either way I have a stock pulley Diameter of 2.5", the Iraggi Pulley is 2". So the way I am looking at it, is if I was to decrease the length of the belt, only the difference in radius should matter, correct? So that would be a difference of .25" which I think the tensioner could more than make up for......I could be wrong just the way Im lookin at it

 

[dman4486 5,000+ posts]

notice where the belt goes around the alternator, you get what looks like (ballpark) 45 degrees of contact between belt and pulley.... if the alt pulley moves toward the main,(assuming the alternator is the tensioner), the angle decreases and you end up with less belt surface area on the pulley.

 

[dman4486 5,000+ posts]

Either way I have a stock pulley Diameter of 2.5", the Iraggi Pulley is 2". So the way I am looking at it, is if I was to decrease the length of the belt, only the difference in radius should matter, correct? So that would be a difference of .25" which I think the tensioner could more than make up for......I could be wrong just the way Im lookin at it

exactly...since you have a tensioner and the alternator is stationary

 

[dman4486 5,000+ posts]

so everyone can visualize, take a rubber-band and stretch it over 2 fingers, then place a finger from the other hand on the inside of the loop, and begin pushing outward against the band...notice as you move farther away, the band gains more and more contact radius with your finger...less slipping

 

[MikeyB 5,000+ posts]

^^^ Very good point I now see where your coming from //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[MikeyB 5,000+ posts]

Obviously in an extremely dramatic case, if there was a large decrease in pulley size, say from 10" to 3" there would have to be a change in belt length since the tensioner could not make up for that big of a difference, correct?