Dave, The issue of pressure zones is a good one. Some years ago following a discussion with Dr. Tim, I set up a water manometer the pressure levels at the top and bottom of the vent chamber. Can't locate the results quickly but they are probably in the archives under ancient history. As a result of those measurements, I sealed off the drivers side vent with a viton flap which is anchored to the top of the engine compartment, the side edge of the defining wheelwell, and open on the bottom. The viton (from a diving shop) was cut to be long enough to go to the bottom of the frame rail. Inside this sealed compartment, I mount my air cleaner (K&N, biggest I could fit) and the air flow sensor. This was to ensure that the hot engine compartment air would not be drawn into the intake. Haven't had a problem in years. Those measurements also showed a high pressure zone in the area of the axle shafts and above the transmission. This is with the diesel sound shield in place. This is where I mounted the Mazda RX-7 external air cooler. But, the area is quite compromised for efficient air to air intercooling. In my case, I am building a liquid to air intercooler with a continuous duty Shurflo electric water pump for recirculation, a small radiator in the front of the vanagon, large diameter heater hose for the routing of coolant and a golf reservoir mounted above the rear axles. It will be triggered by temperature and by the manifold pressure switch. Frank Grunthaner |
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