Positive pressure is in excess of 14.7 lbs at sea level, lower as you get higher in the atmosphere. With a turbine engine running, the pressure goes negative because the stage one fan pulls air into the engine, leaving no air in front of the fan. More air then has to fill the void before being sucked through as well. This, obviously, means that there is always going to be negative pressure in front of an engine, regardless how high or fast that engine is running.
A ram jet, on the other hand, is not even in this discussion because it requires forward motion to supply the air needed to burn fuel, working more like a rocket engine. Instead of using a compressor system to pack in air, a ram jet uses a narrowing of the inside of the tube, a reduction of volume to force the air into the combustion area under pressure. It then, like a rocket, uses the pressurized air to burn the fuel and expels the hot exhaust out the rear, providing thrust. As a result, a ram jet uses no moving parts other than a fuel control to operate. It also, however, requires the aircraft to already be at a speed high enough to supply the required air to operate. Thus, in the world of jet powered airliners, a ramjet isn't an option since it's not self starting or sustaining on the ground nor is it fuel efficient enough to be cost effective to operate as a thrust source to maintain airspeed.
Once again, you've tried to twist the truth and, like normal, your argument not only has no merit, it has no facts or logic to back it