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Group Buy ~ PEX Overdrive Water Pump Pulley ~ $135 Shipped in the USA. Full Details:
[ http://www.twinturbo.net/net/viewmsg.aspx?forum=classified&msg_id=110090 ] Description:
A pulley for the water pump that has a 15-20% smaller diameter (stock sizes TT= 120mm, NA= 130mm), which results in the belt driving the water pump faster than if the belt was driving the stock water pump pulley. Also, as the standard clutch fan is attached to this pulley, the fan's rotational speed is increased, drawing more air through the radiator. Why is it needed?
Engine idle is a particularly stressful time for an engine, oil pressure is low, airflow through the engine bay is almost non-existent, air flow through the radiator is low, and coolant flow is minimal. Combine this with a warm or hot day, + with the added strain of your air conditioner, your cooling system is put under pressure. Then you buy an Under Drive Crank pulley to UP THE POWER, which slows down the water pump and clutch fan by up to 20%, and the ability of the engine to keep cool is right at it's limits. On top of that, with so many FMICs around now, it can all trap in heat. Coolant temps rise at idle by a few degrees anyway, but the stock temperature gauge never tells you this. Since installing my UD crank Pulley, the temps run higher across the board, but at idle, with the Air conditioner on, on a 79 degree day, my coolant temps would slowly rise to about 205 degs, whereas before the UD crank pulley was installed, the coolant temperature would stay around 181 degrees. After installing the pulley the temps have returned to normal.
 Bernie Bilski berniebilski@cox.net
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red (some assembly required)
1995 Nissan Pick-Up XE in Super Black
ZCCNV #390 ~ ECZA #368 Need INSTALLS, DIAGNOSTICS, SERVICE or PARTS in the NoVA/DC/MD area?
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Underdrive pulley users -> PEX Overdrive Waterpump Pulley GB - 
