The NISSAN VQ35HR is a 3.5 L (3498 cc) V6, 4-stroke gasoline engine from the Nissan VQ family. The engine is manufactured at the Nissan Iwaki plant in Fukushima Prefecture. The VQ35HR engine was awarded the top 10 ratings in 2007.
The VQ35HR engine is a redesigned version of the earlier VQ35DE engine. The VQ35HR is equipped with a lightweight aluminum block with a fully balanced four-wheel crankshaft and two aluminum heads with two camshafts (DOHC) and four valves per cylinder.
The Nissan VQ35HR engine is equipped with CVTC on the intake valves, e-VTC on the exhaust valves, and NDIS (Nissan Direct Ignition System) with separate coils on each spark plug. The red line is 7500 rpm.
The compression ratio is 10.6: 1. The bore and stroke are 95.5 and 81.4 mm, respectively. It produces from 297 hp. (221 kW) at 6800 rpm on the Infiniti EX37 version up to 313 hp. (232 kW) at 6800 rpm. On some hybrid car models, this engine produces up to 360 hp. (268 kW), but only in combination with an electric motor. The maximum torque is 358 Nm (36.50 kgm) at 4800 rpm.
VQ35HR Engine Reviews
Cylinder Block VQ35HR
The VQ35HR has an aluminum crankshaft support system with four bearings. The VQ35HR engine uses a rigid ladder frame to support the crankshaft.
To maintain higher engine revs, Nissan adopted a friction-reducing solution: connecting rods. Increasing the height of the cylinder deck allows the connecting rod to be extended by 7.6 mm. The new VQ engine uses asymmetric piston skirts to reduce friction. The connecting rod bolt diameter has been increased from 8 to 9 mm to increase strength by about 25%.
During high-speed operation, the crankshaft can twist and twist, causing noise, vibration and possibly damage to the journals. To cope with this problem, the new VQ35 engine uses a larger journal diameter and a stiffer crankshaft. The crankshaft journal diameter has been increased from 60 mm on the DE engine to 65 mm on the HR version, and the connecting rod diameter has also been increased from 52 to 54 mm, respectively.
The bore is 95.5 mm, the piston stroke is 81.4 mm, and the compression ratio is 10.6: 1. The Nissan VQ35HR engine has two compression rings and one oil control ring. The connecting rod length is 144 mm.
Cylinder Head VQ35HR
The cylinder head is made of durable lightweight aluminum alloy, which provides good cooling performance. The engine is equipped with a hydraulic CVTC (Continuous Variable Timing Control) for the intake cams and an electromagnetic valve timing control (e-VTC) on the exhaust side.
The camshafts are driven by one primary and two secondary chains. The primary timing chain transmits rotary motion from the crankshaft to the intake camshafts, the secondary circuits connect the intake and exhaust sprockets on each head respectively.
The intake valve diameter has decreased from 37.0 mm for the DE version to 36.6 mm for the HR engine, while the exhaust valve diameter has decreased from 31.2 mm to 30.2 mm, respectively. The VQ35HR engine does not have hydraulic lifters, so special lifters are used to adjust the valve clearance.
To reduce resistance to the air intake, the new VQ engine adopts an asymmetrical dual intake configuration. To keep the engine running at high rpm and high power, the VQ35HR engine has a straight intake design.
The engine code breakdown is as follows:
- VQ – Engine family
- Volume – 3.5 liters
- HR – High Response and High Revolution
VQ35HR Engine Specs
Before we move on to considering the device of the Nissan engine, a few words should be said that today this internal combustion engine is mostly used in combination with a hybrid installation ( Hybrid Drive ). So, the VQ35HR engine is an improved version of the legendary power unit of the VQ35DE series, which, unlike its older brother, was created specifically for the top models of the auto concern, built on the basis of Front Midship.
The monitored engine is equipped with an almost identical aluminum cylinder block with two DOHC heads without hydraulic lifters. The gas distribution mechanism is linked by a timing chain, and the phase control system is the same as on the VQ35DE – type CVTCS.
The key difference between the considered power plant and its fellow in the line is a slightly enlarged and reinforced cylinder block (for reference : the block became 0.8 cm higher, the walls are 0.2 cm thicker, the journals with crankshaft liners were also increased in size, and the length of the connecting rods increased from 1.44 to 1.52 cm ).
In addition, the changes also affected the pistons, which, unlike the VQ35DE series, now have asymmetric skirts, and phase regulators in the VQ35HR engine are now installed both at the inlet and outlet. Thanks to all these changes, the compression ratio of the new internal combustion engine has increased from 10.3 to 10.6 points.
The intake and exhaust system has been subjected to no small changes. For example, the oil pump gear was increased, and due to the special DLC coating of the camshaft cams and pushers, the friction of these ICE components was reduced by about 35-40%. As for the cooling system, in the VQ35HR engine it was quite deeply revised and the problems associated with overheating in the 5th and 6th cylinders have sunk into the summer.
VQ35HR Engine Installed On:
- 2007-2008 Infiniti G35 Sedan
- 2007-2008 Nissan Skyline V36 350GT Sedan
- 2007-2008 Nissan 350Z
- 2006-2008 Nissan Fuga 350 GT
- 2008–2012 Infiniti EX35
- 2009–2012 Infiniti FX35
- 2009–2010 Infiniti M35
- 2011–2013 Infiniti M35h
- 2011–2013 Infiniti M35h
- 2011–2013 Infiniti M35h
- 2010-present Nissan Fuga Hybrid
- 2012-present Nissan Cima
- 2012-present Mitsubishi Dignity
- 2014-present Infiniti Q50 Hybrid
- 2014-present Infiniti Q70 Hybrid
VQ35HR Engine Problems & Reliability
- Problems with frequent oil leaks. As a rule, engine oil leaks in a Nissan ICE arise due to unreliable cardboard oil channel gaskets, which are located under the front cover of the power unit. Often, after 100 thousand kilometers of run, grease begins to squeeze out from under the front cover of the internal combustion engine, and therefore, the pressure in the system drops, all sorts of errors in phase regulators appear on the dashboard, and the engine is at a high risk of jamming. Engine jamming occurs when the car owner simply ” scores ” on the problem associated with the loss of lubrication, which ultimately inevitably leads to dry operation of the power plant.
- Zhor of engine oil. The monitored power unit is considered highly reliable, however, in most cases, after 180 thousand kilometers of run, there is a high probability of the onset of an oil grease ( more than 600-700 grams of grease per 1000 kilometers ). According to experts, the main reason for the excessive consumption of oil by the VQ35HR engine is considered to be coking, which is directly related to frequent driving at low speeds or scuffing (appearing due to fine dust from a collapsing catalyst entering the cylinders). Unfortunately, high oil consumption on this power unit is quite common.
- Rare flaws and sores. Such problems often include the consequences that come from the aggressive operation of the car, namely, the rapid clogging of the internal combustion engine filter elements ( air and oil filters ). In addition, the camshaft cover cokes in this engine, which can result in unstable engine operation at low speeds. We must not forget that this engine is not equipped with hydraulic lifters, which is why the car owner will have to periodically adjust the valve clearances on their own or in a specialized car service.
The naturally aspirated Infiniti-Nissan VQ35HR 3.5 V6 engine developed by Nissan engineers can definitely be called an ideally balanced power unit in terms of the ratio of performance to overall reliability. The engine under the serial number VQ35HR 3.5 liter, perfectly complement the already popular engine family ” VQ30 -series “, power plants that are popular and in demand all over the world. The service life of the VQ35HR engine with 6 cylinders, according to the manufacturer, the Nissan company, reaches 250,000-300,000 kilometers of run.
However, very often in reality, the resource of this Japanese with a sporty character can reach up to 380,000-400,000 kilometers to the capital. Thus, the durability of any modern gasoline-type engine directly depends on the correct operation of the car by the car owner, the quality of the refueled fuel and compliance with the periodic maintenance of the power plant in accordance with the manufacturer’s regulations ( frequency of replacement of consumable parts with technical fluids ).