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#81
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Electric fans require 28 amps alone...
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#82
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As I've mentioned before, as the alt (and internal regulator) get warm, the regulated voltage gets lower due to temperature compensation in the reg. Even if you are running at 13.0 volts at the battery, it's getting charged. The voltage should be steady, however.
george
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
#83
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High RPM alternator stops charging
Well of course I would find yet another issue. Been enjoying the car and discovered when I go to play and run my motor up past 5500, shift point is set at 5900, my gen light comes on indicating the alternator isn't charging, when RPM drops light goes out. I didn't pay much attention initially but I discovered the alternator pulley they've installed on this Tuff Stuff unit is quite a bit smaller. Called them up and of course they recommended installing a larger pulley. Didn't know you could over rev an alternator which would cause it to not charge. Anyhow, I'm hoping I still have good charge at idle after I make this change...
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#84
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Sounds to me like one of the wires on the rotor has come un-soldered, and is trying to pull away from centrifugal force, breaking the connection.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#85
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Quote:
BTW, interesting idea of what the problem might be from Paul. |
#86
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I saw that one time before when I did starting and charging systems for a living, and that is what it was. But at any rate, it has to be rotor related since that is the only thing spinning.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#87
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Makes sense, heck I haven't taken that alternator off enough I guess... Seems like any time you buy something nowadays you have to go through 2 or 3 of them before you get a good one...
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#88
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For lack of a better term, I'm gonna say 'brush bounce'.
Figure pulley diameters and get actual alternator rpm's....the rotors not balanced good enough or true enough for the brushes to stay in contact with it. Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
#89
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I've never seen a high RPM issue like the one mentioned. Brush bounce sounds interesting but if it happens, i wouldn't think it would stop charging. I think it would make enuf contact to maintain charge.
Belt slip may be a culprit tho. Broken wire maybe, I would expect it to be defective after the run or be intermittent at normal rpm afterward. George Kujanski
__________________
"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
#90
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I too wouldn't think brush bounce would cause a light. The brushes would still arc, and try to charge, at least enough to turn the light out.
The belt would have had to be so loose it would fly off to cause the light to come on. I've seen some really loose belts and have never seen a light come on because of it. So I would rule out a loose belt also.
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#91
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Hey George and Paul
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A low watt bulb would come on easier in a low charge (unequal voltage) situation. Don't know which is which with 168's and 194's...but I've seen cars that simply swapping bulbs would stop a glowing indicator light at idle. You gents thoughts Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
#92
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Belt slip.
.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#93
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Post #31:
"Right around 150a is where the v-belt starts being an issue where it doesn't have enough contact surface and starts slipping. So my guess is your belt is slipping, and why it's not keeping up. Try changing the belt first, but another guess is you're going to have issues no matter what with a 200a." BTDT .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#94
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Quote:
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#95
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Quote:
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
#96
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Sorry guys, been a bit busy and just catching up.
It's not a loose belt for sure, I use a belt tensioner and I bought a new belt. Light comes on bright red, same as ignition on only before you start the car, so it's not charging like flipping a switch on. The diameters of the pulleys are crank ~7 7/8 in, water pump ~ 6.5 in the alt ~2 1/4 in. Anyone know how to calculate alt RPM? |
#97
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Assuming no belt slip and your pulleys, alternator RPM = engine RPM X 3.5
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#98
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How did you come up with that? If that's right in turning it over 20k rpm with a shift point at 5900.
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#99
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That's right. On the flip side, at an idle of 600 RPM, the alt is at 2100.
George
__________________
"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
#100
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Alternator RPM = Crank Pulley RPM times Crank Pulley Diameter divided by Alternator Pulley Diameter.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
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