RAM AIRCRAFT MODIFICATION, INC.
Waco - Madison Cooper Airport
150 HOUR ENDURANCE TEST A.C. 20-24A
All requirements to comply with FAR 33.49
with specific variables for TS10-520B engine.
Xcel Plus Formula 102
Aircraft Engine Protection for Piston Engines up to 1,000 HP
Xcel Plus Aircraft Piston Engine Treatment Formula 102 was accepted for use in
aircraft piston engines in the fall of 1981.
B. To be accepted, Xcel Plus Aircraft Formula had to pass the150 hour
endurance test A.C. 20-24A.
II. THE TEST
Xcel Plus Aircraft Piston Engine Treatment Formula 102 was tested in an
overhauled Teledyne Continental TS10-520-KSB 285 HP turbo supercharged
reciprocating aircraft engine prepared to simulate an engine with 700 hours
B. The test was designed to put maximum load and wear on the engine in a
relatively short time.
To accomplish this:
a. Cylinder head temperature ranged from 410 to 460 degrees
b. Normal cylinder head temperatures range from 320 degrees
380 degrees F.
c. During test, oil temperature ranged from 230 degrees to
d. Normally, oil temperatures range from 145 degrees to 195
C. Simulated critical altitude was 16,000 feet - was done by restricting
the air intake.
D. Completed test produced conditions which were equal to 1400 hours
of normal wear on a mid-time engine. Normal T.B.O. on this engine is 1400 hours.
E. All parts of the engine were spectrolite air-gauge micrometer
measured before the test.
III. THE RESULTS
After the test, the engine was disassembled and all parts were spectrolite
air-gauge micrometer measured.
B. Some of the findings:
1. Crankshaft maximum net wear
at any measurable point was 4 ten
thousandths of an inch (0.0004").
2. Turbo chargers - 1 ten
thousandths (0.0001") wear maximum at any
3. Camshaft - 0.0000: journal
4. Valve stems - 0.0000" wear.
5. Complete compatibility with
oil, gaskets, miscellaneous greases and
sealant used in engine construction.
6. Oil analysis showed 1 to 2
parts per million (PPM) solids after protection
with Formula 102; normally up to 10 to 11 PPM.
C. Friction test results - "From this data it is assumed that
engine friction at take off and cruise
RPM's is lowered 25 to 30 percent.
Engine friction in this engine is approximately
15 percent of net horsepower. A reduction in friction of 30 percent would mean a
reduction in total friction from 15 percent of net horsepower to approximately
11 percent of net
D. Oil consumption - "Normally
acceptable oil consumption under full
power averages one quart per two hours. Oil
consumption after ten hours of testing was only one pint."
E. Independent inspection report - "This type engine test - 150 hours at
elevated power out put at maximum oil temperature as specified by the FAA TIA -
is equal to a full T.B.O."
"I would consider all findings to be better than acceptable standards."
George Altgelt FAA DER SW-246
**Note: Xcel Plus
formulas tested under different private label