For Those of you that have never seen this, and have questioned it's existence, because someone was trying to keep it as their "personal" property, to aggrandize their part of it, and not make it a public document.

    Based on the 1982 - 1983 Papp International engine.
    This "Papp Engine" was designed and specified by Joseph Papp. It which was machined and built, for Papp International, By Rohner Machine Works, now defunct, with mechanical machine work and assembly assistance from Robert Rohner and electronics designed by John Rohner and programmed, as used, by Tom Rohner and Tom Miller and with the help of several others, as seen in the videos.
This engine was first run in our shop in Florida by Joe Papp, who made the "final" mods and "tweeks" to make it work.
    This became the "Certified Running" engine. This test engine was built with a 4.25 inch stroke and 3.00 inch Bore for ~60 CID.452 Liter, two cylinder in line normally lubed.  The noise in some videos is the Oil pan pumping system hitting the crank.
    Joe then took this engine, after much pressure from us and others, to have it certified by our friends at  Northeastern State University, Tahlequah, OK. This test was done specifically by Dr. George J. Nolan, Professor of Chemistry with the help of Dennis L. Hodges who was a experienced engine tester.

Here is the "Feb. 1983 PAPP Engine CERTIFICATION Document"     for your viewing.

Here are the "Important" findings after a one hour and 6 minute run :
1.  "the engine did run and was certified at 107 hp in February of 1983 by a Oklahoma University group. 

      During the run the engine was operated between 100 and 726 RPM. At 726 RPM it produced 776 ft-lb of torque for 107 HP with a torque rise of 418 % . The dynometer used was a certified AW, which was checked and calibrated prior to the Tests. The certifying professor is willing to discuss the testing. This document was sent to the UP Patent Office which has it logged as well.

    The engine was operated at 726 rpm producing 776 ft-lb of torque 107 HP with a torque rise of 418%.

2. "it produced no heat and required no cooling". Our historical videos, see video page, and those of engines from Saboni through this 1983 Papp International also show this as being true, people
     touch the motor without pain.

3. After started the engine required NO outside electrical input,  Noise level was comparable to a low
     RPM electric motor, quiet, ran cool and passed all expectations.