Quote:
Originally Posted by phunk
I agree. VQ pumps have been notorious for failure. But our VHR's 7500rpm redline was enough to grenade the classic DE pump. So we are better off than the VQ was around 2003. I believe that the VR38 took the pump off the crank and put it down on a chain. But, the Toyota 2JZ seemed to have no problems with the oil pump drive gear interfacing directly on the crankshaft... so there is hope in working with it.
|
Yes the 2JZ pump has a much better reputation but the design on it is clearly more durable. It uses a spline to drive the center gear meaning the center gear has a more uniform thickness instead of the 2 large flats that leave thin spots in the gears in the corners, the spline is also going to absorb the crank vibrations smoother than the Flats which tend to knock around more violently at high speed. The gear set also uses the older tooth style for pump itself which moves less oil, but does give you a more durable outer gear that is more resistant to minor vibration. the vq pump does flow more oil, and probably draws less power but is not as stable at high rpms, if you look toyota uses a vq style gearset and flat drive on the slower v6 and v8 engines.