D16Z6 is a performance engine that was added as a power plant for the 1992-1995 Honda Civic Si / EX and the DelSol Si. It’s a very peppy engine with 125HP and 106 ft-lb of torque, with VTEC engaging at 4800 rpm.
This engine is a favorite for performance seeking racers as its readily available from local auto wreckers and with stock internal parts can be pushed to 200hp with a turbo. Some have claimed that by upgrading the internal parts they have achieved over 500hp but this is only with great care in choosing the right parts, professional assembly and rigorous tuning with an aftermarket ECU.
There are tons of aftermarket parts available that can be simply bolted on and others that take more advanced mechanic skills for the more experience engine tuners.
- Displacement : 1,590 cc (97 cu in)
- Bore and Stroke : 75 × 90 mm (3.0 × 3.5 in)
- Rod Length : 137mm
- Rod/Stroke Ratio: 1.52
- Compression Ratio : 9.2:1
- Horse Power: 125hp @ 6600 rpm
- Torque: 106 ft-lb @ 5200 rpm
- Engine Redline: 7200 rpm
- Fuel Cutoff rpm: 7411 rpm
- Engagement of VTEC: 4800 rpm
- Piston Code: P28
- Head Code: P08
- ECU Code: P28
- ECU Type: OBD1 – MPFI
D16Z6 Cylinder Head and Parts
D16Z6 Cylinder Head – The Cylinder Head sits on top of the engine block and is made of aluminum. The D16Z6 head is stamped with the P08 code and is equipped with VTEC functionality.
D16Z6 Gasket or Head Gasket – The Head Gasket is seated between the engine block and cylinder head and is used to seal in the cylinder for maximum power and to keep the coolant from leaking into the cylinder.
D16Z6 Valve – There are 4 valves per cylinder and sit inside the valve guides of the cylinder head. Two valves are used in the intake cycle and 2 are used in the exhaust cycle. They open and close letting gas mixed with air in and exhaust gases out.
D16Z6 Camshaft – The Camshaft sites on top of the cylinder head and rotates two times the speed of the crankshaft. It coordinates the opening and closing of the valves using special lobes on the shaft.
D16Z6 Camshaft Pulley – The Camshaft pulley is attached to the camshaft and spins half the speed of the crankshaft. It has 2 marks on it to used it during the alignement process to set proper engine timing.
D16Z6 Timing Belt – The Timing Belt is used to connect the camshaft timing pulley to the crankshaft pulley and thus the crankshaft rotation will also rotate the camshaft but only half the rotation.
D16Z6 Valve Cover – The Valve Cover sits on top of the cylinder head and keeps the oil from splashing out into the engine bay and keeps dirt out. It also has an opening for a screw on plastic cap that is used to add oil to the engine.
D16Z6 VTEC Solenoid – The D16Z6 VTEC activates the Variable Valve Timing and Lift Electronic Control mechanism in the rocker assembly of the cylinder head. It sits on the back left side of the cylinder head and usually has 2 plugs going to it.
D16Z6 Engine Block and Parts
D16Z6 Engine Block – The engine block is where the pistons, connecting rods and crankshaft are located it is the bottom half of the engine.
D16Z6 Piston – The D16Z6 pistons are located in the engine block and slide up and down the cylinder walls during the engine cycle. For naturally aspired engines most tuners install a set of D16Z6 High Compression Pistons to get the highest compression which will help to gain more horse power. But for turbo or supercharging applications most tuners usually install low compression D16Z6 turbo pistons to allow more room for compression with a turbo so less pinging or detonation will occur. The most common turbo pistons is the Vitara’s.
D16Z6 Crankshaft – The crankshaft is located at the bottom part of the engine block and is connected to the connecting rods. During the firing order of an engine the crankshaft will rotate in a reciprocating manner as each connecting rod either pulls or pushes.
D16Z6 Block Guard – A block guard is an aftermarket add on to the engine block to help from cylinder wall expansion with high horse power addon.
D16Z6 Water Pump – The water pump is located on the front or right side of the engine and is powered by the timing belt.
D16Z6 Oil Pump – The oil pump sits on the bottom front or side side of the engine and pumps oil to the complete engine assembly.
D16Z6 External Engine Parts
D16Z6 Header – The d16z6 exhaust header is also an aftermarket add on to the engine as it is originally equipped with a standard 4-2-1 exhaust manifold.
D16Z6 Intake Manifold – The intake manifold is attached to the cylinder head and houses the throttle body and the fuel injectors. The air and gasoline mixing is done inside the intake manifold before its sucked in to the cylinder.
D16Z6 Throttle Body – The throttle body is a variable air valve, that opens and closes depending on how much pressure you put on the gas pedal. This is where the outside air after passing through an air cleaner is sucked in and directed into the intake manifold.
D16Z6 Fuel Rail – The fuel rail is a distribution center for gasoline for the 4 fuel injectors for the engine. It has a pressure regulator on one side that regulates how much gas gets pumped into it.
D16Z6 Distributor or Dizzy – The distributor or dizzy is used to distribute high voltage from the ignition coil to each spark plug in a special firing order.
D16Z6 Transmission -The D16Z6 transmission is the Si version and has the P00 – B000 tag stamped on the passenger side of the tranny right beside the inlet for the drive shaft.
D16Z6 Wiring Harness – The wiring harness used for a D16Z6 engine is similar to a D15B7 engine but has additional wiring for the VTEC Oil Pressure Switch and the VTEC Solenoid.
D16Z6 Performance Parts – These are aftermarket D16Z6 parts that help gain horsepower, stability and faster 1/4 mile times at the race track.
D16Z6 Turbo Manifold – A turbo manifold is a specially constructed exhaust piece that allows the mounting of a turbo charger to gain more horsepower, this is only found as an aftermarket part but a very popular addon.
D16Z6 P28 ECU – The D16Z6 P28 ECU is unique in the way that it has extra circuitry which allows it to control the exact time that VTEC will be engaged by the engine. This ECU is found on SI and EX models of the US and Canadian 1992 to 1995 Honda Civic’s.
D16Z6 Bottom End Assembly Animation