| Home / Industrial Engines / Detroit Diesel Engines / Detroit 8V92TA |
Detroit Diesel 8V92TA Specifications
| Engine Model: Detroit Diesel 8V92TA |
| Engine Type: 2-stroke 8-cylinder turbocharged and aftercooled diesel |
| Total Displacement: 736 cu.in (12.2 L) |
| Rated Engine Power: 435-550 Hp (322-407 kW) at 2100 rpm |
| Fuel System Type: Mechanical unit injector |
____________________________________________________________________________________
- Detroit Diesel 12V71T Engine Specifications
- Detroit Diesel DD5 Engine Specifications
- Detroit Diesel DD13 Engine Specifications
| General Technical Data |
The Detroit Diesel 8V92TA is a two-stroke,
turbocharged and aftercooled, V8 diesel engine with unit injectors. This
engine is a high-output variant within Detroit Diesel's "92 Series",
representing the evolution of the earlier 71 Series with a larger bore
and stroke. Production was active from the 1970s through the 1990s. The
8V92TA is a true two-stroke design, utilizing a Roots-type positive
displacement blower for scavenging, augmented by an exhaust-driven
turbocharger and an air-to-water aftercooler.
It is constructed with a cast-iron cylinder block with wet cylinder
liners and individual cast-iron cylinder heads. The engine operates on
the uniflow scavenging principle: air enters through ports in the
cylinder liner and exhaust exits through poppet valves in the cylinder
head.
The 8V92TA is characterized by its substantial power density, responsive
turbocharger boost, and the characteristic two-stoke Detroit Diesel
sound. It is a non-interference engine design. This engine served in
heavy-duty trucking, marine propulsion, and industrial power generation
applications where a compact V8 configuration delivering high Hp was
required.
General Engine Data
Engine Type: Two-stroke, V8 (90-degree V-angle), liquid-cooled,
turbocharged and aftercooled diesel engine.
Bore: 123.8 mm (4.875 in).
Stroke: 127.0 mm (5.00 in).
Displacement: 12250 cc (736 cu.in).
Compression Ratio: 17.0:1.
Firing Order: 1-5-4-8-6-3-7-2.
Cylinder Numbering: Left bank cylinders are 1-2-3-4 (front to rear).
Right bank cylinders are 5-6-7-8 (front to rear).
Engine Rotation (viewed from the flywheel end): Clockwise.
Aspiration: Gear-driven Roots-type positive displacement blower, plus a
single exhaust-driven turbocharger with an air-to-water aftercooler.
Fuel Requirement: Diesel fuel, Number 2-D.
Power Output: Ranges from 435 Hp at 2100 RPM to 550 Hp at 2100 RPM
(322-407 kW), depending on specific tune and injector size.
Torque Output: Ranges from 1250 lb-ft at 1200 RPM to 1450 lb-ft at 1200
RPM.
Governed Speed: 2100 RPM.
Scavenging Air Pressure: 8-12 psi (0.55-0.83 bar) above atmospheric,
post-aftercooler.
Oil Pressure (at operating temperature): 40-60 psi (2.8-4.1 bar) at 2000
RPM.
| Cylinder Block |
The cylinder block is a heavy cast-iron structure forming a 90-degree V
configuration. It incorporates a deep crankcase with integral main
bearing saddles. The block uses removable wet cylinder liners made of
hardened cast iron. Each liner is sealed at the top by a copper gasket
and at the bottom by synthetic rubber O-rings. The liners feature
precisely machined intake ports around their circumference.
The crankshaft is a forged steel unit with five main bearings.
Connecting rods are forged steel with shell-type bearing inserts at the
big end. Pistons are aluminum alloy with a Ni-Resist iron insert in the
top ring groove for durability against high combustion temperatures.
Each piston uses four rings. The piston pin is full-floating, retained
by circlips.
| Cylinder Head and Valves |
Each cylinder has a separate cast-iron cylinder head. The cylinder head
contains two exhaust valves, a unit injector, and provisions for a glow
plug or air start valve. The head lacks intake valves. The exhaust
valves are actuated by pushrods and rocker arms from a single camshaft
located in the V of the engine block. The valve train is adjustable.
Valve seats and guides are replaceable. The cylinder head seals against
the wet liner with a composite steel-asbestos or modern multi-layer
steel head gasket.
Valve Train Data
Valve Arrangement: Two exhaust valves per cylinder (16 total). No intake
valves.
Exhaust Valve Head Diameter: 47.6 mm (1.875 in).
Exhaust Valve Stem Diameter: 11.1 mm (0.437 in).
Valve Lift: 13.5 mm (0.531 in).
Valve Lash (Clearance): 0.38 mm (0.015 in) cold, adjusted at the rocker
arm.
Camshaft Drive: Gear-driven from the crankshaft via an intermediate
idler gear train.
| Fuel System |
The fuel system is a mechanical, camshaft-actuated unit injector system. Each cylinder has a self-contained unit injector. The injector is actuated by a dedicated lobe on the camshaft via a pushrod and rocker arm. Fuel is supplied to the injectors by a gear-type transfer pump at low pressure (30-50 psi / 2-3.5 bar).
Injection timing is fixed, set by the camshaft and injector pushrod
adjustment. Fuel rate is controlled by a mechanical governor linked to a
control rack that rotates all injector plungers simultaneously. A hand
primer pump is used for system bleeding.
Fuel System Data
Fuel Injection Type: Mechanical unit injector.
Injection Pressure: Generated internally by the unit injector, up to
22,000 psi (1517 bar).
Injector Actuation: Mechanical, via camshaft, pushrod, and rocker arm.
Governor: Mechanical centrifugal governor, mounted on the blower drive
housing.
Fuel Transfer Pump: Gear-type, engine-driven.
| Lubrication System |
The lubrication system is a pressure-fed, wet-sump design. A gear-type oil pump, driven from the camshaft gear train, draws oil from the sump. Oil is routed through a full-flow oil filter and a water-cooled oil cooler. Pressure is regulated by a spring-loaded relief valve.
Lubrication is provided to the crankshaft main and rod bearings,
camshaft bearings, blower drive gears, the blower itself, and the
turbocharger center section. The unit injector rocker arms and exhaust
valve rocker arms are lubricated via oil galleries. The system includes
piston cooling jets.
Lubrication System Data
Oil Pump Type: Gear-type, camshaft gear-driven.
Oil Capacity (wet sump): 40 US quarts (37.9 liters).
Oil Filter Type: Replaceable spin-on canister or cartridge type.
Oil Type (recommended): High-quality diesel engine oil, SAE 40 or
15W-40, meeting API Service Classification CD or later.
Oil Change Interval: 100-250 hours of operation, with oil analysis
determining exact intervals.
| Cooling System |
The cooling system is a pressurized, pump-driven dual-circuit system. A centrifugal water pump, gear-driven from the front of the engine, circulates coolant through the engine block, cylinder heads, oil cooler, and turbocharger jacket.
A separate circuit serves the air-to-water aftercooler, using a
dedicated coolant pump and a separate heat exchanger to cool the intake
charge. Thermostats regulate engine coolant temperature, opening at
180°F (82°C). A coolant conditioner is required to prevent liner
cavitation erosion.
Cooling System Data
Cooling System Type: Pressurized, gear-driven pump, dual-circuit with
aftercooler loop.
Coolant Capacity (engine and aftercooler circuits): 35 US quarts (33.1
liters) - system capacity is larger with external radiators or heat
exchangers.
Thermostat Opening Temperature: 180°F (82°C).
Water Pump Drive: Gear-driven from the front gear train.
Aftercooler Type: Air-to-water, with separate coolant circulation.
| Other Systems |
Air System (Scavenging and
Turbocharging)
A Roots-type positive displacement blower is gear-driven from the front
of the engine, providing baseline scavenging air. A single
exhaust-driven turbocharger compresses intake air, which then passes
through the air-to-water aftercooler before entering the blower inlet.
This "Turbocharged-Aftercooled" (TA) configuration increases charge air
density and reduces its temperature, allowing for greater fuel injection
and higher power output without excessive thermal loading.
Starting System
The engine uses a 24-volt or 32-volt DC electric starting system with
two starters. Cold weather starting is assisted by ether injection
systems (cylinder primers). Many industrial and marine versions also
feature air starting capability.
| Dimensions and Weight |
Overall Length: 1650 mm (65.0 in).
Overall Width: 1250 mm (49.2 in).
Overall Height: 1350 mm (53.1 in).
Approximate Dry Weight: 1950 kg (4300 lbs).
| Maintenance Data |
Engine Oil and Filter Change: Every 100 hours for severe truck or
construction duty; up to 250 hours for steady-state marine or generator
operation.
Oil Analysis: Essential for monitoring wear metals and determining
optimal drain intervals.
Air Filter Service: Clean or replace as indicated by restriction gauge;
frequent service is critical.
Valve Lash Adjustment: Check and adjust every 500 hours of operation.
Injector Timing/Rack Setting: Check and adjust every 1000 hours or if
performance declines.
Blower Drive Gear Lash: Check every 1000 hours.
Turbocharger Inspection: Check for axial and radial play, and wheel
condition, every 1000 hours.
Coolant Conditioner (SCA) Level: Test every 250 hours; replenish as
needed.
Aftercooler Core: Clean and pressure test annually to ensure efficiency
and prevent leaks.
| Tightening Torques |
Cylinder Head Bolts: 160-180 lb-ft (217-244 Nm). Tighten in a specific
multi-step sequence.
Main Bearing Cap Bolts: 300-325 lb-ft (407-441 Nm).
Connecting Rod Nut: 70-75 lb-ft (95-102 Nm).
Unit Injector Hold-Down Clamp Bolt: 40-45 lb-ft (54-61 Nm).
Rocker Arm Shaft Bracket Bolts: 40-45 lb-ft (54-61 Nm).
Oil Pan Bolts: 30-35 lb-ft (41-47 Nm).
Blower Drive Gear Nut: 400-450 lb-ft (542-610 Nm).
Water Pump Housing Bolts: 40-45 lb-ft (54-61 Nm).
| Machinery Applications |
The Detroit Diesel 8V92TA engine was installed in a variety of heavy-duty equipment: Heavy Trucks: Long-haul conventional and cabover trucks from manufacturers like Kenworth, Peterbilt, Freightliner, and Western Star. Coach Buses: Intercity and touring coaches from MCI, Prevost, and Eagle.
Marine Propulsion: Planing hull workboats, tugboats, and medium-sized yachts. Generator Sets: Prime and standby power units in the 350-450 kW range. Fire Trucks: As the powerplant for large pumpers and aerial ladder trucks. Military Vehicles: In certain heavy equipment transporters and amphibious landing craft.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |