The Nissan VH45DE is a 4.5 L (4,494 cc, 274.24 cu·in) V8 natural aspirated four-stroke liquid-cooled internal combustion gasoline engine, manufactured by the Nissan Motor Corporation since 1989 to 2001.
The Nissan VH45DE engine has a V8 aluminum cylinder block, dual-overhead camshafts (DOHC) design for increased efficiency and optimal power transfer. This engine used a multi-point fuel injection system and electronic controlled “Coil-on-Plug” ignition system with an individual coil for each spark plug. The VH45DE motor featured variable valve timing (VTC) from 1990 until 1995.
The Nissan VH45DE engine produced from 271 PS (199 kW; 267 HP) at 5,600 rpm to 281 PS (207 kW; 277 HP) at 6,000 rpm of maximum horsepower and from 394 N·m (40.2 kg·m, 290.4 ft·lb) at 4,000 rpm to 400 N·m (40.8 kg·m, 294.8 ft·lb) at 4,000 rpm of peak torque.
General information
| Engine Specifications | |
| Engine model | VH45DE |
| Production | 1989-2001 |
| Engine type | 4-stroke, DOHC, V8 |
| Displacement | 4.5 L, 4,494 cm3, (274.24 cu·in) |
| Max. horsepower | 271 PS (199 kW; 267 HP) at 5,600 rpm 281 PS (207 kW; 277 HP) at 6,000 rpm |
| Max. torque | 394 N·m (40.2 kg·m, 290.4 ft·lb) at 4,000 rpm 400 N·m (40.8 kg·m, 294.8 ft·lb) at 4,000 rpm |
| Ignition system | Electronic ignition system |
| Fuel system | Multi-port Fuel Injection |
| Power adder | None |
| Firing order | 1-8-7-3-6-5-4-2 |
| Cooling system | Liquid-cooled |
| Lubricating system | Wet sump |
| Dimensions (L x W X H) | 890 x 740 x 725 mm (35 x 29.1 x 28.5 in) |
| Dry weight | 225 kg (496 lbs) |
Cylinder Block
A 93.0 mm (3.66 in) cylinder bore and 82.7 mm (3.26 in) piston stroke give the VH45DE engine a total of 4,494 cc of displacement. Compression ratio rating is 10.2:1.
The engine used an aluminum cylinder block, forged steel crankshaft, forged steel connecting rods, 6-bolt main bearing caps with studs, full-length main bearing girdle, floating pistons with molybdenum coating. Each piston is fitted with two compression rings and a single oil ring.
Connecting rod length is 147.0 mm (5.78 in), crankshaft main journal diameter is 63.960 mm (2.5181 in) and crankpin diameter is 51.970 mm (2.0461 in).
| Cylinder block | |
| Cylinder block alloy: | aluminium |
| Compression ratio: | 10.2:1 |
| Cylinder bore: | 93.0 mm (3.66 in) |
| Piston stroke: | 82.7 mm (3.26 in) |
| Cylinder internal diameter (standard): | 93.000-93.010 mm (3.6614-3.6618 in) |
| Piston skirt outer diameter (standard): | 92.980-92.990 mm (3.6606-3.661 in) |
| Number of piston rings (compression / oil): | 2 / 1 |
| Connecting rod big end diameter (standard): | 55.000-55.013 mm (2.1654-2.1659 in) |
| Connecting rod small end diameter (standard): | 24.980-25.000 mm (0.9835-0.9843 in) |
| Connecting rod center distance: | 146.95-147.05 mm (5.7854-5.7894 in) |
| Piston pin diameter: | 21.989-22.001 mm (0.8657-0.8662 in) |
| Side clearance (Top): | 0.040-0.080 mm (0.0016-0.0031 in) |
| Side clearance (Second): | 0.030-0.070 mm (0.0012-0.0028 in) |
| Ring end gap (Top): | 0.270-0.460 mm (0.0106-0.0181 in) |
| Ring end gap (Second): | 0.390-0.630 mm (0.0154-0.0248 in) |
| Ring end gap (Oil): | 0.200-0.690 mm (0.0079-0.0272 in) |
| Number of main bearings: | 5 |
| Crankshaft main journal diameter: | 63.960 mm (2.5181 in) |
| Crankpin journal diameter: | 51.970 mm (2.0461 in) |
| Crankshaft center distance: | 41.35 mm (1.63 in) |
Cylinder Head
The Nissan VH45DE engine used aluminum cylinder head with dual overhead camshafts, sodium-filled exhaust valves, cross-flow cooling system, hydraulic lash adjusters, single-row silent timing chain, 4 valves per cylinder (32 in total) and variable valve timing system (VTC) on the intake side (1990-1995). Intake valves are 38.0 mm (1.4961 in) in diameter and exhaust valves are 33.0 mm (1.2992 in).
| Cylinder head | |
| Cylinder head alloy: | aluminium |
| Valve arrangement: | DOHC, chain driven |
| Valves:: | 4 ,(32 valves in total) |
| Head height: | 130.7-130.9 mm (5.1457-5.1535 in) |
| Intake timig: | 248° |
| Exhaust timig: | 248° |
| Valve head diameter (INTAKE): | 38.0-38.3 mm (1.4961-1.5079 in) |
| Valve head diameter (EXHAUST): | 33.0-33.2 mm (1.2992-1.3071 in) |
| Valve length (INTAKE): | 101.70-102.30 mm (4.0039-4.0276 in) |
| Valve length (EXHAUST): | 102.12-102.72 mm (4.0205-4.0441 in) |
| Valve steam diameter (INTAKE): | 6.966-6.971 mm (0.2743-0.2744 in) |
| Valve steam diameter (EXHAUST): | 7.960-7.965 mm (0.3134-0.3136 in) |
| Valve spring free length (INTAKE): | 47.30 mm (1.8622 in) |
| Valve spring free length (EXHAUST): | 47.30 mm (1.8622 in) |
| Camshaft lobe height (INTAKE): | 37.919-38.109 mm (1.4929-1.5004 in) |
| Camshaft lobe height (EXHAUST): | 35.279-35.469 mm (1.3889-1.3964 in) |
| Camshaft journal diameter : | 25.935-25.955 mm (1.0211-1.0218 in) |
Tightening torque
| Tightening torque settings | |
| Cylinder head bolts | Step 1: 29 N·m (3.0 kg·m, 22 ft·lb) Step 2: 93 N·m (9.5 kg·m, 69 ft·lb) Step 3: Loosen all bolts completely Step 4: 25-34 N·m (2.5-3.5 kg·m, 18-25 ft·lb) Step 5: Turn all bolts 90-95° |
Service Data
The SG oil with a viscosity of SAE 5W-30, 10W-30 is recommended for the VH45DE, refilling oil capacity with the oil filter is 6.0 L (6.34 US. qt, 5.28 Imp. qt.). Recommended spark plug is NGK: PFR5G-11.
| Compression pressure | |
| Standard: | 13.0 bar (13.3 kg/cm2; 189 psi) |
| Minimum: | 10.0 bar (10.2 kg/cm2; 145 psi) |
| Compression differential limit between cylinders: | 1.0 bar (1.0 kg/cm2; 15 psi) |
| Oil system | |
| Oil consupumtion: | up to 0.5 (1 qt. per 1200 miles) |
| Oil type: | SG |
| Recommended oil: | SAE 5W-30, 10W-30 |
| Oil capacity: | 6.0 L (6.34 US. qt, 5.28 Imp. qt.) |
| Oil change interval: | 12,000 km (7,500 miles) |
| Fuel system | |
| Type: | Multi-port Fuel Injection |
| Ignition system | |
| Type: | Electronic ignition system |
| Spark plug: | NGK: PFR5G-11 |
| Spark plug torque: | 25 N·m (2.5 kg·m, 18.4 ft·lb) |
Applications
| Model | Years Produced |
| Infiniti Q45 | 1990-1996 |
| Nissan President | 1990-2002 |
Author:
Be the first to comment