Overdrive pulley

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Mar 27, 2015 | 02:56 AM

Will Bite

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From: Ohio

Overdrive pulley

Has anyone used a overdrive pulley on there 6.0 and if so did it really make a difference at idle, and where did you get it.

Mar 27, 2015 | 03:31 AM

dannyboy950

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What are you calling a overdrive pulley. What exactly is it on.

Mar 27, 2015 | 04:59 AM

87crewdually

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From: So. Jersey

I have not used one on my 6.0 but I've seen them for sale on eBay. It's just a smaller pulley so it turns the alternator faster.

Mar 27, 2015 | 05:06 AM

Will Bite

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From: Ohio

Found one one Ebay just wondering if it's worth the 15 bucks . http://m.ebay.com/itm/170925366867

Mar 27, 2015 | 06:26 AM

jsm180

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From: Lakeland, Fl

I bought a Motorcraft from amazon. Depends on your alternator how much it helps, some of the high output ones need more rpm to get the output at idle.

Robot Check

Mar 27, 2015 | 07:56 AM

dannyboy950

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AAAHHH OK makes sense now. Sorry my brain wasn't in gear yet when I saw that. Never actually heard it called that before. LOL
Guess I am just a backwater swamp boy. LOL

Mar 27, 2015 | 11:03 AM

diesel_dan

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From: Foothills, CA

I've got one on the shelf -- you are right I expect it only to help at idle. I haven't been in a hurry as I still see decent volts w/ glow plugs on and then as soon as they kick off I'm up to high 13s low 14s at idle. We have the factory 140A "upgraded" alternator -- ordered truck that way. Sometimes it's just luck as we (or hardly anyone back then) had no clue on FICM, Injector issues low voltages could cause. We just knew we'd have a camper and horse trailers with batts we'd be charging off the truck.

I put solar on the camper, so I never tie the two together...

Ford should have put the 140A on as the smallest alt in the 1st place.

There also is the whole upgrading the charge wire route you can do too...

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Mar 28, 2015 | 03:21 AM

Yahiko

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From: Spanaway

Quote:

Originally Posted by Bullitt390

It helps the stock 110, 140 or the 3G 130 amp at idle.

You want the 57-58mm pulley.

Josh

What he said ^^^^
Ebay for about 12~14 $

Sean

Mar 28, 2015 | 09:24 AM

#10

mattdoc88

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Does anyone know the max allowable speed for the alternator? And the factory alt pulley and crankshaft pulley diameters? If someone gives me that info, I'll check that it doesn't overspend the alt, which can lead to failure. Also I'll give the alt rpm with both pulleys based on engine rpm.

Mar 28, 2015 | 09:57 AM

#11

dannyboy950

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Quote:

Originally Posted by mattdoc88

Are you factoring in the other unknown pulley dia. or just use overall belt length?
There seems to be two schools of thought on this, intermediate pulleys do not count belt lengh is sufficent. The other says you need to factor in all pulley dia.

Myself I useually get lost in the equations.LOL

Mar 28, 2015 | 10:24 AM

#12

xaviar

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I've been using an overdrive pulley for a year. No problems. And as stated, works better at idle. this the one i bought as was referenced here. I also installed the 140amp upper alt from a dual alt SD setup until i upgrade the big wire kit and 250amp setup from Ed at FICM repair.

http://www.ebay.com/itm/170910011638?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Mar 28, 2015 | 01:51 PM

#13

Will Bite

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From: Ohio

Quote:

Originally Posted by xaviar

I've been using an overdrive pulley for a year. No problems. And as stated, works better at idle. this the one i bought as was referenced here. I also installed the 140amp upper alt from a dual alt SD setup until i upgrade the big wire kit and 250amp setup from Ed at FICM repair.
http://www.ebay.com/itm/170910011638?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

That was the one I was looking at. I think I'll give it a try. Thanks

Mar 29, 2015 | 07:30 PM

#14

mattdoc88

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Quote:

Originally Posted by dannyboy950

You need crankshaft pulley diameter and alternator pulley size. Using the ratios of those you can figure out for each engine rpm, what the alt rpm is. All the other pulleys in the belt train and the belt length itself are irrelevant for this calculation. It's a simple calculation once you know how to math the numbers together.