Are there any problems with the Nissan VQ40DE?
The Nissan VQ40DE is reliable and durable, but sometimes the following problem can happen: High oil consumption. The VQ40DE has a catalytic converter and they are very sensitive to the fuel quality. They produce ceramic dust, which damaging the cylinders sleeve and piston rings.
How often do you change the valve clearance on a Nissan VQ40DE?
The valve clearance needs to be adjusted every 60,000 miles of mileage (90,000 km). The Nissan VQ40DE life expectancy is 200,000 miles of mileage (300,000 km). Calculate the thickness of new adjusting valve lifter so valve clearance comes within specified values.
How big is the intake valve on a VQ40DE?
The intake valve diameter is 37.0-37.3 mm (1.45-1.46 in) and the exhaust valve diameter is 31.2-31.5 mm (1.22-1.24 in), duration is 240°/244°, respectively. The VQ40DE motor does not have hydraulic lifters, so special valve lifters are used to adjust the valve clearance.
What is firing order of Nissan VQ40DE engine?
Also these engines use electronic throttle body, long plastic intake manifold and modified exhaust system. They are equipped with quite reliable timing chain, it will not cause any problems. VQ40DE firing order is 1-2-3-4-5-6. Besides this engine, VQ series also included such models as VQ37, VQ35, VQ30, VQ25, VQ23 and VQ20.
Can a Nissan VQ40DE be turned into a high rev engine?
Do not try turning it into high rev naturally aspirated engine, since it is created as low RPM motor for SUVs. The most reasonable way is buying VQ40 supercharger kit. Usually the one by Stillen is used. It lets gaining 90 HP more on stock internals. It will be more than enough for your SUV.
What kind of valve timing does Nissan vq40 have?
On intake camshafts these heads use variable valve timing system C-VTC. VQ40 cams have duration 240/244 deg, lift 10.0/9.6 mm. This engine has not been equipped with hydraulic lifters, so be ready to regulate the valves every 60,000 miles of mileage (100,000 km).
What kind of supercharger do I need for Nissan VQ40DE?
The most reasonable way is buying VQ40 supercharger kit. Usually the one by Stillen is used. It lets gaining 90 HP more on stock internals. It will be more than enough for your SUV. You may also add performance exhaust system and some more aggressive cams, what will give 20-30 HP yet. But more likely these performance parts are excessive.