Bigger Alt. Pulley
#83798
07/03/08 11:57 PM
07/03/08 11:57 PM
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Joined: Oct 2003
Posts: 65 DeWitt, Michigan
kbmadness
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OP
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Posts: 65
DeWitt, Michigan
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Where can I get a bigger pulley for my altenator. I believe mine is a 3 inch and I need a 4 to 5 inch. Does anyone know which model might have what I'm looking for, I have a 340.
67 Cuda -Stroked 416 FOR SALE
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Re: Bigger Alt. Pulley
[Re: kbmadness]
#83799
07/04/08 10:45 AM
07/04/08 10:45 AM
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Joined: Jan 2003
Posts: 5,186 Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
Where can I get a bigger pulley for my altenator. I believe mine is a 3 inch and I need a 4 to 5 inch. Does anyone know which model might have what I'm looking for, I have a 340.
Too add, did Mopar alternators have different size pulleys for our Mopars? There are after market underdrive and overdrive pulleys out there, but what about stock pulleys?
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Re: Bigger Alt. Pulley
[Re: stumpy]
#83802
07/04/08 01:11 PM
07/04/08 01:11 PM
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Joined: Nov 2007
Posts: 21,827 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,827
Kirkland, Washington
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Quote:
If you slow it down it won't charge like it should and if you speed it up you may end up spinning the solder out of it. What are you trying to do?
"spinning the solder out of it" New terminology! Not sure what it means though....
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Re: Bigger Alt. Pulley
[Re: stumpy]
#83805
07/04/08 03:44 PM
07/04/08 03:44 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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Aurora, Colorado
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To speed the alternator up, you waant a smaller pulley. The alternator speed is the ratio of the crank pulley diameter divided by the alternator pulley diameter times engine RPM
If the crank pulley is 7" and the alt pulley is 3.5, the ratio is 2:1 so if the engine is at 1000 RPM, the alternator is spinning at 2000 RPM. This is good for getting power out of the alternator, the problem is if your engine spins 7,000 RPM the alternator is at 14,000 RPM (given the 2:1 ratio.) Not all alternators can handle the really high RPMs, the centrifical (sp) force on the windings at high RPM can cause them to sometimes come loose. On the race engine, I chose to use a Denso alternator because it is rated to 14,000 RPM.
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Re: Bigger Alt. Pulley
[Re: kbmadness]
#83809
07/06/08 10:25 PM
07/06/08 10:25 PM
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Joined: Oct 2003
Posts: 65 DeWitt, Michigan
kbmadness
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OP
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Posts: 65
DeWitt, Michigan
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I'm trying to slow my water pump down. I have tried just about everything that I can think of to fix the over heating problem. The guy who dyno my car says that the water pump is too fast.
67 Cuda -Stroked 416 FOR SALE
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Re: Bigger Alt. Pulley
[Re: kbmadness]
#83810
07/06/08 10:30 PM
07/06/08 10:30 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
I'm trying to slow my water pump down. I have tried just about everything that I can think of to fix the over heating problem. The guy who dyno my car says that the water pump is too fast.
Do you run a thermostat, what water pump and radiator? How did he diagnose the water pump is 'spinning too fast'?
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Re: Bigger Alt. Pulley
[Re: GoodysGotaCuda]
#83811
07/06/08 10:33 PM
07/06/08 10:33 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Regardless of whether changing the speed on the water pump will solve an overheating problem, changing the alternator pulley WILL NOT change the water pump speed.
Only thing that will slow down the pump is:
a smaller crank pulley,
ore
a larger pump pulley.
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Re: Bigger Alt. Pulley
#83812
07/06/08 10:35 PM
07/06/08 10:35 PM
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Joined: Jan 2003
Posts: 25,200 Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Regardless of whether changing the speed on the water pump will solve an overheating problem, changing the alternator pulley WILL NOT change the water pump speed.
Only thing that will slow down the pump is:
a smaller crank pulley,
ore
a larger pump pulley.
I agree with that. Some body is misleading you if you were told that changing the alt. pulley would slow the pump down. I sure wouldn't go back to him.
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Re: Bigger Alt. Pulley
[Re: earlybee]
#83814
07/08/08 04:34 AM
07/08/08 04:34 AM
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Joined: Oct 2003
Posts: 65 DeWitt, Michigan
kbmadness
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OP
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Joined: Oct 2003
Posts: 65
DeWitt, Michigan
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I have tried just about every different over heating idea that is known to man. The guy where I get my car dyno at suggested trying twomore things. 1.) bigger alt, pulley, 2.) Weld shut the opening where the cap is on my aluminum radiator. Use a puke tank that has a radiator cap and will hold about a half gallon of coolint. This will eliminate air pockets that cause over heating.
67 Cuda -Stroked 416 FOR SALE
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