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Engine General Information

Based on a post by Sam Burr at  CarGurus.com
1999 was the last year of production for the Fairlady Z in japan and 1996  for the 300zx in North America.
The '96 is  a bad year to get as it lost variable valve timing due to the switch to OBDII emissions, and so  part of the powerband was lost. They are still 300bhp stock with a manual transmission and 280bhp stock with an auto transmission (they lowered it for the auto because it is weak and would burn out).

The engine is a pentroof combustion chamber, 24 valve, dohc, 3.0L 60 degree V6.
Nissan designed it to almost be 2 3 cylinders on the same crank, it has a true dual exhaust, true dual intake with dual intake manifolds and throttle bodies, and in the turbos case, twin turbos with twin intercoolers. 

​The 300zx has independent dual wishbone suspension all round with 11 inch rotors and 4 piston calipers in the front, and 11.7 inch rotors and 2 piston calipers in the rear. It comes stock with a viscous type, limited slip differential that actually performs very well. 

Modification
They respond very well to mods but if not taken care of,  can be very expensive. The stock turbos are limited to about 15 psi which is where the stock injectors need replacing anyway. the stock 3 speed fuel pump in the twin turbo can handle about 700hp, and the stock 2 speed in the non-turbo is good to about 450hp.

The '96 is hard to modify because of the OBDII emission changes and there aren’t many, much needed, ecu upgrades for that year. A 1995 is the best year to get for a twin turbo, and the only years you really don’t want to get, apart from a '96, is the 90 and 91.

So aim for a '92 - '95, and 5 speed manual transmission is  more fun and handles much better power than the automatic.

NISSAN VG30DETT

 

Engine Specifications

Engine code

VG30DETT

Layout

Four stroke, V6

Fuel type

Gasoline (petrol)

Production

1987-2000

Displacement

3.0L, 2,960 cc (180.62 cu in)

Fuel system

Multi Point Fuel Injection

Power adder

Twin T22/TB02 turbochargers

Power output

280 PS (206 KW; 276 HP) at 6,400 rpm
284 PS (209 KW; 280 HP) at 6,400 rpm
330 PS (242 KW; 325 HP) at 6,800 rpm

Torque output

382 Nm (39.0 kg·m; 281.9 ft·lb) at 3,200 rpm
384 Nm (39.2 kg·m; 283.4 ft·lb) at 3,200 rpm
388 Nm (39.6 kg·m; 286.3 ft·lb) at 3,600 rpm

Firing order

1-2-3-4-5-6

Dimensions (L x W x H):

–

Weight

–

 

Cylinder block

Cylinder block alloy

Cast-iron

Compression ratio:

8.5:1

Cylinder bore:

87.0 mm (3.43 in)

Piston stroke:

83.0 mm (3.27 in)

Number of piston rings (compression / oil):

2 / 1

Number of main bearings:

4

Cylinder inner diameter (standard):

87.000-87.010 mm (3.4252-3.4256 in)

Piston skirt diameter (standard):

86.975-86.985 mm (3.4242-3.4246 in)

Piston pin outer diameter:

21.993-22.001 mm (0.8657-0.8662 in)

Piston ring side clearance:

Top

0.040-0.073 mm (0.0016-0.0029 in)

Second

0.030-0.063 mm (0.0012-0.0025 in)

Oil

0.015-0.185 mm (0.0006-0.0073 in)

Piston ring end gap:

Top

0.21-0.40 mm (0.0083-0.0157 in)

Second

0.50-0.76 mm (0.0197-0.0299 in)

Oil

0.20-0.76 mm (0.0079-0.0299 in)

Connecting rod small end diameter:

22.000-22.012 mm (0.8661-0.8666 in)

Connecting rod center distance:

154.1-154.2 mm (6.067-6.071 in)

Crankshaft main journal diameter:

62.975 mm (2.4763 in)

Crankpin diameter:

49.974 mm (1.9675 in)

Crankshaft center distance:

41.47-41.53 mm (1.6327-1.6350 in)

Main bearing beam bolts tightening procedure and torque specs:

§  90-100 Nm; 9.2-10.2 kg·m; 67-74 ft·lb in two-three stages

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing nut

§  Step 1: 14-16 Nm; 1.4-1.6 kg·m; 10-12 ft·lb

§  Step 2: Turn nuts 60-65° or 59-65 Nm; 6.0-6.6 kg·m; 43-48 ft·lb

Crankshaft pulley bolt

§  216-235 Nm; 22-24 kg·m; 159-174 ft·lb

Flywheel (M/T) or Drive plate (A/T) fixing bolts

§  83-93 Nm; 8.5-9.5 kg·m; 61-69 ft·lb

Cylinder head

Block head alloy

Aluminium

Valve Arrangement:

DOHC, belt drive

Head surface flatness

Less than 0.05 mm (0.002 in)

Valves:

24 (4 valves per cylinder)

Intake valve timing

248°

Exhaust valve timing:

248°

Valve head diameter:

INTAKE

34.0-34.2 mm (1.339-1.346 in)

EXHAUST

29.5-29.7 mm (1.161-1.169 in)

Valve length:

INTAKE

103.1-103.3 mm (4.06-4.067 in)

EXHAUST

103.6-103.8 mm (4.079-4087 in)

Valve stem diameter:

INTAKE

6.965-6.980 mm (0.2743-0.2748 in)

EXHAUST

7.945-7.960 mm (0.3128-0.3134 in)

Valve spring free length:

OUTER

43.1 mm (1.697 in)

INNER

43.1 mm (1.697 in)

Camshaft cam height:

INTAKE

40.405-40.595 mm (1.5907-1.5982 in)

EXHAUST

40.405-40.595 mm (1.5907-1.5982 in)

Camshaft journal diameter:

27.935-27.955 mm (1.0998-1.1006 in)

Head tightening procedure and torque specs:

§  Step 1: 39 Nm; 4.0 kg·m; 29 ft·lb

§  Step 2: 123 Nm; 12.5 kg·m; 90 ft·lb

§  Step 3: Loosen all bolts completely

§  Step 4: 34-44 kg·m; 3.5-4.5 kg·m; 25-33 ft·lb

§  Step 5: Turn all bolts 65-70° or to 123 Nm; 12.5 kg·m; 90 ft·lb

Camshaft sprocket bolts

§  123-132 Nm; 12.5-13.5 kg·m; 90-98 ft·lb

 

MAINTENANCE DATA

Compression pressure

Standard

12.0 kg/m2 (171 psi) / 300 rpm

Minimun

9.0 kg/m2 (128 psi) / 300 rpm

Compression differential limit between cylinders

1.0 kg/m2 (15 psi) / 300 rpm

Oil system

Oil consumption , L/1000 km (qt. per miles)

up to 0.5 (1 qt. per 1200 miles)

Recommended engine oil

5W-30, 10W-30, 10W-40, 20W-40, 20W-50

Oil type API

API SG

Engine oil capacity (Refill capacity)

With filter change 3.4 l (3-5/8 Us. qt., 3 Imp. qt)
Without filter change 3.0 l (3-1/8 Us. qt., 2-5/8 Imp. qt.)

Oil change interval, km (miles)

Every 6,000 (3,750)

Oil pressure

Idle speed (78 kPA, 0.8 kg/cm3, 11 psi)
3,000 rpm (353-451 kPA, 3.6-4.6 kg/cm3, 51-65 psi)

Ignition system

Spark plug

NGK Platinum-tipped type: PFR5B-11B

Spark plug tightening torque

20-29 Nm; 2.0-3.0 kg·m; 14-22 ft·lb

 

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