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Bigger Alt. Pulley #83798 07/03/08 11:57 PM 07/03/08 11:57 PM
Joined: Oct 2003 Posts: 65 DeWitt, Michigan kbmadness OP member
kbmadness OP member Joined: Oct 2003 Posts: 65 DeWitt, Michigan	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

Re: Bigger Alt. Pulley [Re: kbmadness] #83799 07/04/08 10:45 AM 07/04/08 10:45 AM
Joined: Jan 2003 Posts: 5,186 Wherever I am. J Junky master
Junky master J Joined: Jan 2003 Posts: 5,186 Wherever I am.	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? 2010 Black Challenger SE <> 3.5 V6 Custom Shift Knobs www.flameball.com Check It Out

Re: Bigger Alt. Pulley [Re: Junky] #83800 07/04/08 11:50 AM 07/04/08 11:50 AM
Joined: Jan 2003 Posts: 32,943 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,943 Grand Prairie,Texas	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?

Re: Bigger Alt. Pulley [Re: kbmadness] #83801 07/04/08 01:02 PM 07/04/08 01:02 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	you have a PM live every 24 hour block of time like it's your last day on earth

Re: Bigger Alt. Pulley [Re: stumpy] #83802 07/04/08 01:11 PM 07/04/08 01:11 PM
Joined: Nov 2007 Posts: 21,830 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,830 Kirkland, Washington	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....

Re: Bigger Alt. Pulley [Re: stumpy] #83803 07/04/08 01:30 PM 07/04/08 01:30 PM
Joined: Jan 2003 Posts: 5,186 Wherever I am. J Junky master
Junky master J Joined: Jan 2003 Posts: 5,186 Wherever I am.	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? Can't remember where I saw it, but something like a 10% difference between pulley sizes for our old mopars. I'm trying to find an inexpensive way to up the amps at idle with a stock alternator so it stays charging to keep lights from dimming/flickering. I've done everything I can with the wiring, but still dim (sometimes flickering) lights at idle. Even if I run relays for the head lights, still gonna have dim or flickering tail lights, tac light and dash lights. Under-drive (larger) pulleys are easy to find. A 10% decrease in pulley should not be a problem. It doesn't hurt them running the engine constantly at 3,500 RPM's down the highway in stead of 2,500 RPM's. That's over 30% difference and it doesn't hurt the alternator. Yes? Seems like there was or is a difference in pulley size with and without A/C. No? Where am I wrong? Last edited by Junky; 07/04/08 01:31 PM. 2010 Black Challenger SE <> 3.5 V6 Custom Shift Knobs www.flameball.com Check It Out

Re: Bigger Alt. Pulley [Re: Junky] #83804 07/04/08 03:27 PM 07/04/08 03:27 PM
Joined: Jan 2003 Posts: 32,943 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,943 Grand Prairie,Texas	The windings on the rotor are soldered and if they get hot enough they soften the solder enough to "throw" it off at high rpm. Doesn't happen often but does happen. It looks like you caught some tin foil in the alt and chewed it up.

Re: Bigger Alt. Pulley [Re: stumpy] #83805 07/04/08 03:44 PM 07/04/08 03:44 PM
Joined: May 2008 Posts: 5,399 Aurora, Colorado 451Mopar master
451Mopar master Joined: May 2008 Posts: 5,399 Aurora, Colorado	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.

Re: Bigger Alt. Pulley [Re: 451Mopar] #83806 07/04/08 09:29 PM 07/04/08 09:29 PM
Joined: Feb 2005 Posts: 709 St Louis, MO 63026 convx4 super stock
convx4 super stock Joined: Feb 2005 Posts: 709 St Louis, MO 63026	Did you add a better ground to each headlight when you added the relays to the factory wiring? I added relays and better grounds to my 65, and it helped ALOT . I am not afraid to drive at night any more.

Re: Bigger Alt. Pulley [Re: 451Mopar] #83807 07/04/08 09:59 PM 07/04/08 09:59 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Quote: To speed the alternator up, you waant a smaller pulley. Yep if you want to increase the charge rate you will have speed up the alternator and that will take a smaller alternator pulley. Clean it, if it's Dirty. Oil it, if it Squeaks. But: Don't fix it, if it Works!

Re: Bigger Alt. Pulley [Re: MoparforLife] #83808 07/04/08 10:11 PM 07/04/08 10:11 PM
Joined: Aug 2007 Posts: 6,096 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,096 Valencia, España	Quote: Quote: To speed the alternator up, you waant a smaller pulley. Yep if you want to increase the charge rate you will have speed up the alternator and that will take a smaller alternator pulley. +1 With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: Bigger Alt. Pulley [Re: kbmadness] #83809 07/06/08 10:25 PM 07/06/08 10:25 PM
Joined: Oct 2003 Posts: 65 DeWitt, Michigan kbmadness OP member
kbmadness OP member Joined: Oct 2003 Posts: 65 DeWitt, Michigan	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

Re: Bigger Alt. Pulley [Re: kbmadness] #83810 07/06/08 10:30 PM 07/06/08 10:30 PM
Joined: Nov 2004 Posts: 25,050 Texas GoodysGotaCuda 5.7L Hemi, 6spd
GoodysGotaCuda 5.7L Hemi, 6spd Joined: Nov 2004 Posts: 25,050 Texas	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'?

Re: Bigger Alt. Pulley [Re: GoodysGotaCuda] #83811 07/06/08 10:33 PM 07/06/08 10:33 PM
A Anonymous Unregistered
Anonymous Unregistered A	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.

Re: Bigger Alt. Pulley #83812 07/06/08 10:35 PM 07/06/08 10:35 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	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.

Re: Bigger Alt. Pulley [Re: MoparforLife] #83813 07/07/08 01:23 AM 07/07/08 01:23 AM
Joined: Jan 2003 Posts: 8,064 Arlington, Texas earlybee master
earlybee master Joined: Jan 2003 Posts: 8,064 Arlington, Texas	https://board.moparts.org/ubbthreads/show...;gonew=1#UNREAD

Re: Bigger Alt. Pulley [Re: earlybee] #83814 07/08/08 04:34 AM 07/08/08 04:34 AM
Joined: Oct 2003 Posts: 65 DeWitt, Michigan kbmadness OP member
kbmadness OP member Joined: Oct 2003 Posts: 65 DeWitt, Michigan	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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