"Power" pulleys and alternator output... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ItsRandy · 07-22-2012, 06:11 PM

Anyone have any experience with aftermarket under-driven accessory drives effecting alternator output and cooling efficiency. My 100 amp alternator only charges 12.1-12.3 volts @idle and 12.8-13.1 volts @2000 rpm. The water temp is in the 195-215 range with a 180 deg. thermostat, 2 row 1.25" tube aluminium radiator the air conditioning on and 100 deg outside. I was thinking of changing my crank pulley from a 5.5" (under-driven) to a 7" (stock size) pulley. What do you guys think?

07-22-2012, 06:11 PM	#1
ItsRandy Registered User Join Date: Nov 2010 Location: Grand Terrace, Ca. Posts: 1,607	"Power" pulleys and alternator output... Anyone have any experience with aftermarket under-driven accessory drives effecting alternator output and cooling efficiency. My 100 amp alternator only charges 12.1-12.3 volts @idle and 12.8-13.1 volts @2000 rpm. The water temp is in the 195-215 range with a 180 deg. thermostat, 2 row 1.25" tube aluminium radiator the air conditioning on and 100 deg outside. I was thinking of changing my crank pulley from a 5.5" (under-driven) to a 7" (stock size) pulley. What do you guys think?

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