Model 39 in 1940 Feb 27, 2021 16:15:46 GMT -8
Post by renny on Feb 27, 2021 16:15:46 GMT -8
Unfortunately, that does seem to be the showstopper with this particular theory. While it seems you saw it immediately, ambi, I was busy looking at the individual trees rather than seeing the forest! I was looking at a whole bunch of other considerations issues before even noticing this.
To build upon ambi's point, consider what would happen if the outlet check in the expansion cylinders was set merely at a pressure equal to that of the fully expanded air. When the slide valve opens, the 200 psig exhaust from 2 motor cylinders will fill the proposed manifold extending down both sides of engine and press against all 14 inlet checks. If an inlet check from the expansion manifold leading into 1 of the 7 cylinders intended to operate expansively opens, and the ball check of the outlet within that cylinder is set to a pressure equal to that of the fully expanded air, then that outlet check will immediately pop open. Thus, the recaptured exhaust from the 2 motor cylinders will flow directly from those motor cylinders, through the proposed manifold, into the expansion cylinder, right out of the bottom of that cylinder, and into the main conduit without doing any useful work on the piston.
Likewise, if the checks from the manifold to the 7 cylinders which are proposed to be operating at this time as pump cylinders open, and the pump cylinder outlet check is set to the same pressure as the fully expanded air being pumped, then that new air pressure entering the cylinder will also flow right through the pump cylinder and out into the main conduit.
Increasing the pressure setting on the outlet check would also not provide a viable solution. In order to hold on to the exhaust air, and trap it so that it can be used expansively, then the cylinder outlet check must be set for a pressure such that it will not open when the recycled higher pressure air to be expanded first enters the expansion cylinder.
However, that also means that any gain in work performed during the compression stroke, as the air assists by expanding and pushing on the bottom of the piston during the compression upstroke, will be more than offset on the return pump stroke. During the pumping downstroke, the expanded air will first have to be recompressed back to the pressure it was at when it first entered the expansion cylinder (which was still not great enough to pop the outlet check to the main conduit) and then further raise it to a pressure great enough to crack open the outlet check.