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Its got a oil pump housing from BullTear and a FlowKooler water pump on it......so im not too sure wut exactly im dealing with but i do know i need to take my to an over all height of 1.905" down to 1.85"......got a buddy that has lathe and a mill so ima just alter the one i have.
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just a question, what is the purpose for underdrive pulley?
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Spins everything at a slower rate than stock......your alternator and power steering pump will be much happier spinning slower..........i know 6k RPMS ain't that high..but for stock accessories it is haha :t:
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Spinning the accessories (P/S, alt, water pump, fan, even A/C) slower takes less horsepower, so the engine has a little more, maybe 10-20 HP to put to the rear wheels.
The down side is that at low RPM, like idle, all the accessories put out less. They work great for a race car where you're trying to squeeze every bit of power to the rear wheels, but not so good on a rock crawler where you need every bit of accessory power (particularly cooling and P/S) at right around idle. Remember that a belt powered fan will turn slower too. If you use an electric fan, you're alternator is turning slower and has less output.
Bob
tufcj
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I have a High flow water pump that i think spins a bit to fast and cirrculates faster than it cools....alternator is a 93 AMP AC Delco, and my P/S pump is a AGR High flow pump.......got a deal on the Rock Ram kit.......the one for 40" tires or bigger so i think i gots everything covered....but theres only one way to find out i guess
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Alternator output is generally rated at about 6000 RPM alternator shaft speed, about 2000 RPM engine speed, not at idle. The alt turns 2.5-3 X as fast as the crank. At 600-700 RPM idle, some factory alternators don't put out enough voltage to keep up. Underdrive pulleys will slow it down even more.
I've got a 100 amp Bosch on my CJ with stock pulleys, if I don't rev it slightly on start-up, it won't turn out my charge warning light (aftermarket).
Bob
tufcj
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Hmm......at bout 600-700 RPMs with the stock pulley my gauge always read at 14 volts.......if it don't work out right then i'll just swap it out for a stock and save it for later i guess.... :-|
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Well it worked out great....cirrculates the w/p enough so i wont overheat, spin p/s pump enough to steer awesome and spins alt. good enough to supply 13 volts!