TC18EA - Three-Quarter Left Front View
TC18EA - Three-Quarter Left Rear View
TC18EA - Three-Quarter Right Rear View
TC18EA - Bottom View
TABLE OF SPECIFICATIONS 988TC18EA
GENERAL
- TypeDouble row static radial, air cooled, with three exhaust-driven,
blow-down turbines geared to crankshaft - Number of Cylinders18
- Bore6.125 in.
- Stroke6.312 in.
- Piston Displacement3350 cu. in.
- Compression Ratio6.70:1
- Supercharger Ratio6.46:1, 8.67:1
- Impeller Diameter13.5 in.
- Turbine Drive Ratio6.52:1
- Turbine Wheel Diameter11.45 in.
- Rotation of Crankshaft (from rear)Clockwise
- Rotation of Propeller Shaft (from rear)Clockwise
- Reduction Gear Ratio988TC18EA1, 3, 4, and 6 .4375:1
988TC18EA2 and 5.355:1 - Propeller Shaft Spline Size60A
DIMENSIONS
- Overall Diameter (over cowl seal channel)56.59 in.
- Overall Length89.53 in.
WEIGHTS
- Total Dry Weight of Engine ± 1 per cent988TC18EA1 3645 lb
988TC18EA2 3745 lb
988TC18EA3 3645 lb
988TC18EA4 3675 lb
988TC18EA5 3775 lb
988TC18EA6 3675 lb
LUBRICATING SYSTEM
- TypeDry Sump
- Oil SpecificationWAD No. 5815 or 5818
- Oil Grade120 or 100
- Oil Pressure (rear pump)70 ± 5 psi
- Oil Pressure (front pump)35 ± 5 psi
- Oil Pressure (power recovery turbine)50 ± 5 psi
- Oil Inlet Temperature (normal maximum)85°C (185°F)
VALVES AND VALVE TIMING
- Intake OpensFront, 45° B. T. C.
Rear, 55° B. T. C. - Intake ClosesFront, 56° A. B. C.
Rear, 56° A. B. C. - Exhaust OpensFront, 70° B. B. C.
Rear, 70° B. B. C. - Exhaust ClosesFront, 45° A. T. C.
Rear, 55° A. T. C. - Valve Clearance
- Cam Timing Check.055 in.
- Adjusting010 in.
IGNITION SYSTEM
- TypeLow Tension with manual or
automatic Spark Advance - Magneto and Distributor Timing (cylinder No. 1)25° B. T. C. - Compression Stroke
- MagnetoScintilla DLN-9
- Spark Timing25° B. T. C. - Compression Stroke (RETARD)
30° B. T. C. - Compression Stroke (ADVANCE) - Spark PlugsAC 275, 285 .015 - .018 in. gap
Champion R-103, RHA29N .015 - .018 in. gap
FUEL SYSTEM
- TypeDirect Fuel Injection
- Master ControlBendix PR-58-S-2
- Master Control Assembly DrawingWAD No.136723N2 TC18DA1, 2; R3350-34,91
WAD No.136723N5 TC18DA3, 4
WAD No.136723N6 TC18EA1, 2, 3, 4, 5, 6; R3350-38
WAD No.136723N4 TC18EA1 - Fuel Injection PumpBendix D9H3
- Fuel SpecificationAMS 3036A
- Fuel Grade115/145
- Fuel Pressure25 ± 1 psi
- Fuel Injection Pump Timing (established on cylinder No. 1)25° B. T. C. - Compression Stroke
WATER INJECTION
For engine equipped with anti-detonation injection (A.D.I.)
- Water Injection Fluid50/50 MIX AMS 3006A Type I (above -45°C)
60/40 MIX AMS 3006A Type IV (below -45°C)
1% Corrosion Resistant Oil Allowable - NOTE:Oils such as Dromus "B" and Donax "C" or their equivalent are acceptable.
These oils are only soluble in water and therefore must be added and mixed
prior to the addition of the Methyl alcohol.
CYLINDER HEAD TEMPERATURE
- Ground Operation260°C (500°F)
- CAUTION: Hold all ground operation to an absolute minimum.(Maximum)
BMEP CONSTANT AND POWER CALCULATION
- Torque Cell Pressure Constant KTC988TC18EA2, 5 201
All Others142 - BMEP Constant KE236
- Gage Pressure Ratio H988TC18EA2, 5 1.174
All Others1.662 - BHP (British Horse Power) =(BMEP x RPM) / KE or
(Torque Cell Pressure x RPM) / KTC
| Accessory Drives and Type | Location | Ratio | Maximum Continuous Torque In. -lb | Maximum Static Torque In. -lb | Rotation | Maximum Overhung Moment In. -lb |
|---|---|---|---|---|---|---|
| Fuel Pump, XIII-A | Lower Left Side | 1.000:1 | 25 | 450 | CC | 15 |
| Fuel Pump, XIII-A | Lower Right Side | 1.000:1 | 25 | 450 | CC | 15 |
| Fluid Power Pump (12 tooth spline drive-shaft provided) | Upper Right | 1.400:1 | 600 | 2700 | C | 350 |
| Fluid Power Pump, XI-A | Upper Left | 1.400:1 | 250 | 1650 | C | 75 |
| Generator, XII-C | Lower Left | 3.110:1 | 1500 | 6600 | C | 400 |
| Generator, XII-C | Lower Right | 3.110:1 | 1500 | 6600 | C | 400 |
| Spare Drive, XI-A | Lower Center | 1.400:1 | 250 | 1650 | C | 75 |
| Tachometer, XV-A | Lower Right Side | 0.500:1 | 22 | 50 | C | 15 |
| Tachometer, XV-A | Lower Right Side | 0.500:1 | 22 | 50 | CC | 15 |
| Propeller Governor, XX | Top Front Section | 0.857:1 | 125 | 825 | C | 30 |
| Starter, XIV-C (12 tooth spline starter jaw provided) | Center | 1.000:1 | --- | 36000 | C | 350 |