Smaller Pulleys = more power?
Thread Starter
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
Smaller Pulleys = more power?
I saw a ad in the summit catalog for smaller pulleys which stated you could gain hp increase by turning the accessories (power steering pump, alternator, etc) slower. Has anyone installed smaller pulleys and had this result?
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
and if you use your car on the street you'll run into other problems. Mainly the alt not putting out enough volts for headlights and wipers. Everything will be extremely low on power while stopped at a light. Some have converted over to the new style alternators DBelectronics I think the company was that was selling wire harness adapters and Durangoboy had a write on here years ago on how to do it. Cooling system usually does ok as long as you have a mechanical fan.
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
And doing so...which many of my customers have down...can cause the alternator NOT to charge correctly when sitting at idle....but going down the road it is fine....and in time.....many of these same customers had me put I back factory.DUB
Burning Brakes
Joined: Jul 2009
Posts: 1,132
Likes: 14
From: A town SC
Yep on the idle charging issues. I have one March underdrive pulley on my crankshaft for clearance issues with the crossmember on my big block. When cold it idles around 550/600 rpm and all lights flicker because of the alt rpm. When it warms up or goin down the road its fine. It drives me insane but theres no way to fix it that ive found.
Le Mans Master
Joined: May 2003
Posts: 8,877
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From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
Yep on the idle charging issues. I have one March underdrive pulley on my crankshaft for clearance issues with the crossmember on my big block. When cold it idles around 550/600 rpm and all lights flicker because of the alt rpm. When it warms up or goin down the road its fine. It drives me insane but theres no way to fix it that ive found.
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Le Mans Master
Joined: May 2003
Posts: 8,877
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From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
Yep on the idle charging issues. I have one March underdrive pulley on my crankshaft for clearance issues with the crossmember on my big block. When cold it idles around 550/600 rpm and all lights flicker because of the alt rpm. When it warms up or goin down the road its fine. It drives me insane but theres no way to fix it that ive found.
Not knowing how big or small your alternator pulley is currently.....hopefully what 'Righard454' posted a link to can help you get it right.
I can COMPLETELY understand the flickering lights. It would take abort 3 minutes and I would be freaking out.
DUB
