Guys, I am going to make one point here from experience, I am not an engineer nor do I claim to be one.

I just finished 30 years in the transit maintenance industry. Along those years we have been always fighting engine cooling issues in the summer time with hot temperatures. All the coaches I dealt with had a side mounted radiator, and sometimes even an AC condensor in front of that. Early versions had an engine gear driven radiator fan. Around town doing slow speeds, it worked fine.

Now on the highway, it was a different story. At highway speeds, you could see the engine temperature rise quite quickly. Even running down hill, the engine would not cool off.

My opinion was that the air running down the side of the coach was causing "low air pressure" in front of the radiator opening or what I often call vacuum. With the vacuum in front of the radiator, and the fan causing vacuum on the back side of the radiator, the air required for cooling was stalled or had very little movement toward the stronger side.

Get the coach down to 35mph and the engine immediately cooled down because now the fan could overtake the vacuum on the outside of the radiator causing air to flow through the radiator.

Yes we did try a large air scoup. And it helped. But to get it to be really effective, it would stick out to far from the coach, snatching potential passenger right off the side walk.

Today, the transit industry is still using side mount radiators & charged air coolers. But they are using hydralic fan drives now that are so powerful, they can do the job to overtake the "low air pressure issues" at the side mounted heat exhangers.

With all this in my mind, I don't think a CAI would do well from a side opening of any sorts, at least at high speeds when you need it most.

I am not here for an argument, just letting others know what I have delt with over the years.

James