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#1
07-02-2022, 05:31 PM
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Alternator pully
Anyone know where i can obtain a 3" or 3 1/2" pulley.Stock pulley is 2 1/2" and takes too much belt tension to prevent sqeeling using the duralast 1352-6-3 105 amp inwhich destroyed front alt bearing.It has a lifetime warranty but i hate to tear another one up .yes serpentine whould be the way to go.
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#2
07-02-2022, 06:33 PM
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what width size is your belt?
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#3
07-02-2022, 07:29 PM
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I bought a deep alt pulley on ebay!Never lost a belt.Tom
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#4
07-02-2022, 10:23 PM
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That style alternator had rear bearing problems. It was usually the rear that would get destroyed. Probably a defect bearing. You have a warranty. Why not try again. A bigger diameter pulley would lower the output curve.
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#5
07-02-2022, 10:36 PM
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3 inch Delco pulley. Number 8 size. very uncommon size. Corvette used wider pulleys than this and they also had a deep groove meaning wider belt capability. A Vet pulley may be what Tom got on ebay.
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#6
07-02-2022, 10:39 PM
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Quote:
https://www.autozone.com/batteries-s...6-3/540688_0_0 What pulley did you install? Is it the right one for the belt width you have? |
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#7
07-02-2022, 10:56 PM
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Summit has plenty.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#8
07-03-2022, 06:18 AM
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I would like to questioning if you don’t mind why you need such a high amperage Alt in the first place?
At idle are you running A/C, Rad fans, high beams on and a cranked out 1100 watt stereo?
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I do stuff for reasons. |
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#9
07-03-2022, 08:16 AM
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Running stock size v belt for alternator,replaced serpentine pulley with stock v pulley.Old style 10si couldn't keep up with elec trans cooler fan,in tank fuel pump,blower motor ,wipers volts would drop to 12.5 at cruise at idle 11.5 -12.Will check summit
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#10
07-03-2022, 08:55 AM
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cogged vee belt for PS, but smooth or cogged Gates (if you can find it) for Alt. Definitely helps to find that larger Pulley. I got all mine from the u-pull-its.
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#11
07-03-2022, 11:00 AM
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Just ordered march performance -150 pulley 4" from scummit.thanks everyone
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#12
07-03-2022, 12:25 PM
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A larger diameter pulley will lower your output at any speed, so if your output is not at 14 volts now at cruise and idle with the loads you have it definitely will not be better with a larger diameter pulley. With any alternator, current output INCREASES with alternator shaft speed to a limit at about 6000 RPM shaft speed. Increasing pulley size reduces your shaft speed at a given engine RPM.
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 |
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#13
07-03-2022, 01:30 PM
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The Voltage Regulator will provide!
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#14
07-03-2022, 03:33 PM
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George voltage drop was with the stock 10si .I now have a cs style alternator
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76 T/A 455, cnc chamber E heads,OF hyd roller ,yella terra shaft rockers 11.47 119 |
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#15
07-07-2022, 10:19 AM
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CS130s are known to bearing failures, the bearings are too small.
A 4" pulley will definitely lower your output, especially at idle, and you will be right back to where you started. I would suggest a 12si type, my go-tos are the PowerMaster 7294 & the 47293 (100a/150a respectively). .
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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 |
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#16
07-07-2022, 11:24 AM
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12Si is a great choice, but a 10si can easily be built to handle the load if the battery sized and up to the tasks.
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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