The
photo above shows the parts of the 1st Opposed Piston Pulling Rod Engine (OPRE)
prototype, the photo below shows the middle part of the cylinder (the holes are
the ports).
Below is the 1st OPRE
prototype, and the moving parts of the 2nd OPRE prototype.
In the
1st prototype, for 50+50=100mm Stroke and 83mm Bore, the total length of the
gray cast iron cylinder (made of three pieces) is 515mm. The total height of the
piston is 207mm (crown and ring-land from steel). Two single piece connecting
rods, with 75mm center to center length. Two single piece crankshafts. The
center to center distance of the two crankshafts is 278mm.
In the 2nd prototype ("combustion bore" 80mm, "pump
bore" 86mm, stroke 50+50=100mm), the total length of the (single piece) aluminum
cylinder is 450mm (compare this length to the height of a 100mm stroke
conventional engine). The total height of each piston is 172mm. Two single piece
connecting rods, with 67.5mm center to center length. Two single piece
crankshafts. The center to center distance of the two crankshafts is
231mm.
The
drawing above is the transition from the PRE (left) to the conventional engine
(right). The photo below shows the right piston with the connecting rod at its
normal, for PRE, position, and the left piston with its connecting rod rotated
for half a turn, as in the drawing above.
Click on the image below to download the
PRE17.exe animation (1.2 MB) of the second OPRE prototype.
