I think that the air flow kit is a New Holland thing. At one time, or maybe they still do, NH put a different style fan in their CR machines, I don't think the fan had as much air output as the CIH 8010 machines. To use all the airflow somebody came up with a kit to put in the NH CR combines to seal up the self leveling sieves better.
8010's do have a more aggressive fan upgrade. If I recall correctly it is a 9 bladed fan vs. whatever the stock one is. If you add it, make sure you get the fan belt back on correctly. There are 2 different ways you can make it fit. One way the belt slips, plugs the radiator, overheats the engine, and all you can do is scratch your head because everything looks kosher. We bought our's upgraded incorrectly and lets just say the belt wasn't the first thing we attempted to fix...
There may be an airflow kit for the cleaning system too. This was just the one I was aware of.
You're probably right about the upgrade for the engine radiator cooling fan.........I wonder which one they've upgraded/changed the most over the years........feeder house/feeder apron chain design or the radiator screen/fan design?
The Air Flow Control works the same in a CIH machine as in the New Holland CR combines. The 'paddle' fan in the CR and 'Squirrel Cage' fan in the CIH both put out a lot of air, and that's part of the problem. The air speed has to be higher than it should be in order to offset air loss, and the lack of control of the air makes the combines harder to perform well consistently. In 2008 there were about 10 CIH combines where the owners equipped the machines with the Air Flow Control and results were consistently positive. If you watch the video at www.newhollandrochester.com and look at some of the comments currently on the New Holland part of this site under Air Flow Control, you'll get a better idea of why controlling the air is necessary. If you want to talk to CIH owners who have used the seal kit, send me an email at [email protected]
Almost without exception the fan will be run slower. The typical response of blowing grain out because of too much air will occur if you keep the same fan speeds as you had without the kit. One customer had to drop fan speed in barley from roughly 800 to 550 rpm, but typically 10% lower rpm is what happens. The lower sieve becomes much more effective and return levels drop. For that reason, opening up the pre-sieve a 'notch or two' can be done without some of the lower sieve overload happening. That said, it isn't always necessary or helpful to run the pre-sieve wider. Because the air speed is lowered wihtout risking collapse of the air stream, the top sieve lets grain through more easily.
5thgen, the kit was developed at NH Rochester. I'd given a VHS tape showing the air loss to NH when the 2002 demo combines were put out and we had serious shoe issues. They declined the opportunity to do something about the air loss so I did it myself. Wolters, the kit costs $780.00 and there is $30.00 for UPS freight. (I have an inquiry from Australia and the freight is a bit more for that kit!). The first one takes 20-22 man hours but my guys have it down to about 12. I tell people it takes two guys one day to do the job once they have done one machine. It would be so simple if it were done at the factory and cost would be much less. I have yet to see a case where this kit caused an operating problem in some condition.