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| Re: WTB Underdrive crank pulley |
Subject: Re: WTB Underdrive crank pulley
by ddgonzal on 2017/8/14 1:54:07
Nismo used to sell underdrive pulleys (smaller diameter than stock pulley)
* 99996-H1160 SMALL DIAMETER CRANK PULLEY -- has a diameter of 101mm, works with stock accessories (compare to stock pulley at 139mm or 129mm)
* 12302-H5720 SMALL DIAMETER CRANK PULLEY -- diameter of 75mm, requires special belt and accessory pulleys
Yes, smaller crank pulley is said to prevent water pump cavitation which is reportedly a problem above 8000 RPM. But it won't help overcharging, if anything will cause undercharging until substantially above idle (the Voltage Regulator controls overcharging)
Datsun water pumps were cast iron impellers by Atsugi or Hitachi, and are supposedly less susceptible to cavitation
Newer Nissan and aftermarket pumps use pressed steel impellers, much cheaper to make, and are reportedly more likely to cavitate
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