| From | Message |
Tim
Dodge Dakota
JOIN HERE
12/11/2002
22:08:24
|
 Subject: underdrive pulley
IP: Logged
Message:
I have just installed a flex 150 fan and reinstalled my underdrive crank pulley. I had them off with a supercharger which has been removed and sold. I am concerned with the alternator charging now do to the extra fan load that I did not have before.
I have the towing package on the truck which I beleive gives you a smaller alt pulley of 2.5".
What is the diameter of some of yous please?
|
Tim
Dodge Dakota
JOIN HERE
12/12/2002
11:51:17
| RE: underdrive pulley
IP: Logged
Message:
I solved my concern on the alternator. I just ordered a 1 7/8" alt pulley which will bring my alt back up to speed. I will still gain from slowing down the power steering a/c and water pump but will not have the charging problems at idle.
|
Tim
Dodge Dakota
JOIN HERE
12/12/2002
13:00:32
| RE: underdrive pulley
IP: Logged
Message:
I have read through a lot of old negative posts on underdrive pulleys. This is how they work, with just the crank pulley which is down sized from stock by 25% it slows down all driven accesories (a/c,powersteering,waterpump and alternator)by 25%. The two pulley set uses the same down sized crank and a oversized alternator thus slowing the alternator even further than the 25% crank only. Some even use a third water pump pulley which is larger in diameter reducing its rpm even further.
Now if you use a crank pulley down sized 25% you slow all accesories by 25% but you down size the alternator pulley by 25%, this will bring the alternator back to stock speed. These are sometimes called power amp pulleys.
If you need more charging from your alternator at a idle, like with large stereo equipment you could leave the stock crank pulley and just change the alternator pulley to a smaller one. This would be the same as running at a fast idle to increase the charging of the alternator.
Just remember you have to change the belt length with any change.
|
Glenn
Dodge Dakota
JOIN HERE
3/25/2003
02:40:59
| RE: underdrive pulley
IP: Logged
Message:
If you don't mind...where did you get that pulley. I need one also!! E-Mail me please GLN305@satx.rr.com
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
