New Genuine Toyota Part
BGRS is pleased to be able to stock AE111 Blacktop pulleys and provide AE101 Silvertop with a 2 week lead time for a far more reasonable price than ever before.
VVT is a great thing.
On the Silvertop and Blacktop 4AG's, the VVT system adds 30 crankshaft degrees of intake cam timing (15 degrees of physical movement on the camshaft itself) for greatly increased valve overlap when power is needed. The result is a significantly increased mid-range (about 15% or more) and moderately improved top-end over a similar engine with static intake cam timing. But, if you took your 20V and just left the cam 30 degrees advanced you would experience a very smelly exhaust, poor fuel economy, and decreased power below 2,200 and above 6,500 rpm or so, depending on the engine's state of tune. By utilizing a system to dynamically change this you can have your cake and eat it too.
After many miles of continued use, most systems with a moving helical gear will begin to "rattle" as clearance is worn between the machined parts. On a 4AG this is know as the VVT "rattle of death". A dealership could provide you one possibly after a long waiting period but the cost would be close to $500 or more.
**It seems that the Silvertop Pulley has been discontinued. They may only be available through dealer's that have remaining stock, which we can source from. **