AuroraGirl
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Cant confirm these to be100% but i have no reason to thinnk either is lyingDisclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
I see them as cheap as about $15, and as much as about $75. Just looking up info, it looks like the OE crank pulley is about 7.5 inches. The OE alt pulley is about 4.5 inches, so about a 2 to 1 ratio, give or take. And the overdrive pulleys run just under 2 inches. So with out doing all of the math, and taking a bunch of measurements, the 2 onch pulley should turn a little over twice as fast as the 4.5 inch pulley. Looking at 5he chart that @AuroraGirl posted, the OE pulley is turning around 1500 RPMs at idle of about 750 RPMs. The overdrive pulley should turn around twice as fast as the OE pulley, or around 3000 RPMs.I just remembered something: I had an underdrive crank pulley before that included an overdrive alternator pulley. I got it used though, no idea what brand it was. You may start there with your search, trying to schmooze a supplier out of just the alternator pulley.
hairpin stators are a newer technology. no gmt400 or even gmt800/900 came with a hairpin alt from factory. my 2014 ford had a 160a hairpin alt from factoryAre there any factory examples of that or is it an aftermarket thing?
Wouldn't a higher amperage alternator
I see them as cheap as about $15, and as much as about $75. Just looking up info, it looks like the OE crank pulley is about 7.5 inches. The OE alt pulley is about 4.5 inches, so about a 2 to 1 ratio, give or take. And the overdrive pulleys run just under 2 inches. So with out doing all of the math, and taking a bunch of measurements, the 2 onch pulley should turn a little over twice as fast as the 4.5 inch pulley. Looking at 5he chart that @AuroraGirl posted, the OE pulley is turning around 1500 RPMs at idle of about 750 RPMs. The overdrive pulley should turn around twice as fast as the OE pulley, or around 3000 RPMs.
Well, from what I've been looking at, all of the OE pulleys are close to the same size. All around 4 inches. The overdrive pulleys are about 2 inches. So a lot smaller. It also looks like smaller aftermarket pulleys will for Ford or GM.Im actually going to pull a part tomorrow. And im thinking of snatching smaller pulley if i can find anything to do some testing on this. Is there any measurements you may like or any pulleys from some other manufacture for pic or measurement?
Any way you can get an amp clamp around your fans and determine what they are pulling? This info may better guide you.
Yes, I do see 14 volts on the gauge above 1000 RPMs. My thoughts are to try a smaller pulley first. If that doesn't do the trick, then I will eventually replace the alternator with a bigger or higher out put alternator. I have no issues with the battery keeping up with the extra draw, and that is why I have let this go so long. I just want to make it better that it is now, even though it's not a real problem. LOL, it's just triggers my little voice we all have, and that voice says, hey man, that just isn't rite. You need to fix that, before it's a problem.X2 on this.
Kenny, do you see around 14V on the gauge above 1K RPM? If not, your 105A stock alternator is probably being pushed beyond its limits. E-fan setups can draw a ton of amperage, especially when they first start up.
Hopefully you can get what you need with a different pulley, but if not you may need to look at higher output aftermarket alternators.