Engine : VG30DE(TT)
Link to : Compare to Early VG30DE(TT)(Z32 '90-'93)
Product Description:
Stock VG30 variable Valve Timing Control (VTC) intake camshaft sprockets are non-serviceable units that are notorious for leaking oil and making noise. Oil leakage occurs because the rear cover can rotate independent from the sprocket, this wears its o-ring seal and eventually leads to an oil leak. The noise is typical with high-mileage sprockets and/or aftermarket higher-pressure valve springs that cause the cams to over-rotate on every cylinder's intake valve-closing event. This over-rotation causes the VTC piston to screw itself onto the VTC helix and overpower the piston return spring. As the cam continues to rotate, the valves close and the valve spring pressure diminishes to the point where the return spring slams the piston back to its stop creating the audible tick that is indicative of a noisy VTC. By design, the VTC function is to advance the intake cams 20 degrees (crankshaft) from off idle to roughly 5800 RPM to increase torque in this RPM range. At idle and high RPM the VTC is in its static "zero advance" position which reduces valve overlap for smooth idle characteristics and increases torque at higher RPMs - and it is only in the zero advance position that the VTCs can make noise. True VTC noise can be verified by activating the VTC solenoids using a ConZult or by grounding their green with black stripe wires while the engine is idling. This will cause oil pressure to build within the sprocket, forcing the VTC piston to screw onto the VTC helix thus advancing the cam and removing the window of opportunity to make noise. Typical VTC noise will stop entirely when doing this and the engine will begin to idle rough due to excessive valve overlap. BDE rebuilt VTC sprockets feature a redesigned piston return spring specifically engineered for the load needed to prevent camshaft over-rotation with installed valve spring pressures up to 90 lbs and permit full VTC function. Oil leaks are eliminated by replacing the o-ring and positively locating the rear cover with a dowel pin thereby preventing it from rotating.
Please Read :
Core fee must be paid upfront, to not have to pay the core charge up front, you have the option to send in your cores first thus eliminating any core charge. Otherwise you pay the core charge, send us your cores later and you will be refunded the charge.
PLEASE call us for availability if your project is time sensitive! Keep in mind, if we are out of stock, this is considered a built-to-order part and BDE will not be able to start work on them until the cores are received. Their build time frame once cores are received, is 6 weeks.
***** Cores MUST be the same version as purchased, under no circumstances will early model VTCs be accepted as cores towards the purchase of late model VTCs and Vice Versa. *****
BDE does not supply VTC front covers. When shipping your cores, keep your VTC front covers and hardware to re-use. Late VTC front covers are different than Early front covers, AND, Late front covers are no longer available from Nissan.
Optional 3rd Element Timing Indicator
Camshaft degreeing takes into account machining variations throughout the entire engine and synchronizes each camshaft's timing precisely to the crankshaft. In the past, after degreeing with a traditional two element timing system, the end number on the adjustable pulley's timing scale would have no relevance to the now "degreed" camshaft timing and this could lead to a potential for confusion while tuning. Multiple camshafts, all with different final settings, tend to compound the issue even further. The BDE 3rd element allows camshaft timing to now make sense after degreeing so you can make tuning changes on the dyno and always know where your original degreed zero point was.
Optional Hard Anodized Front Covers
Nissan discontinued the front VTC covers for Late type VTCs awhile ago, so we have made these slick 6061 aluminum front covers and hard anodized them to protect from the spring wearing into them. Includes two covers, o-rings, and stainless steel screws.