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 F.A.A.  Testing     


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
_____________________________________________________

I. ACCEPTANCE

A.  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

A.  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 flying time.

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 F. 
    b.  Normal cylinder head temperatures range from 320 degrees to 
         380 degrees F.
    c.  During test, oil temperature ranged from 230 degrees to 250       
        degrees F.
    d.  Normally, oil temperatures range from 145 degrees to 195  
         degrees F.

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

A.  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 
     measurable point.


3.  Camshaft - 0.0000: journal wear.

4Valve 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
horsepower."


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