Jon Walker Cessna 414A Owner/Pilot "We have operated two C414A's over the last eight years or so, both equipped with American Aviation intercoolers. After we installed the intercoolers, we witnessed and increase in cruise performance (using the same power settings as before) of some 8-10 kts over the stock intercoolers. We also saw needncrease of 150-200 fpm in hot weather climbs - when you neet it the most. We could count on 199-200 kts at 10,000'; 206-208 at kts 15,000'. We routinely cruise at 75%. In order to know how much horsepower we were pulling we installed temperature probes in the inlet and discharge sides of our new intercoolers. With known induction air temperature an accurate horsepower can be calculated (without it it's just a guess). We see temp drops of over 120 degrees in the mid-teens, and I am sure the decrease is fairly linear as you go upstairs. We found the drop in temperatures across the intercoolers was right in-line with American Aviation's advertising claims. The primary reason the American intercoolers are so effective is that they utilize a bigger and more effective cooler and they put an effective air intake scoop on the nacelle, something Cessna basically ignored when they built an otherwise great airplane. Induction air heat takes a big toll on engine performance. According to the Teledyne-Continental engine handbook, for each six degrees (F) increase above standard day temp (59F), the TSIO-520 NB loses one percent of it's horsepower. The Cessna P.O.H. says nothing about this little known fact and even lists the same MAP/RPM combinations for a given percent of HP from sea level all the way to 20,000'. It doesn't take a rocket scientist to know the induction air temperatures is going to climb steadily as the waste gates close to maintain MAP causing actual HP to drop significantly on the way up. We have owned three Cessna 414's in the last twelve years. We would never own another one without the American Aviation intercoolers - they absolutely give the best return for the money of all the performance mods on the market." Jon Walker, Cessna 414A Owner/Pilot Randy Cooper Cessna 414 Corporate Chief Pilot "I would like to take this opportunity to express my satisfaction with American Aviation's ULTRAcooling System. Nearly six years 2100 flight hours ago my company purchase our 1979 Cessna 414 Ram Series III. It met all of our job requirements but it was a little anemic in the takeoff and climb department in anything but the coolest air. In looking for better performance in these areas we requested and received an information kit about the American Aviation system. Based on that information we placed our order and soon our FBO had it installed. Let me say I am inherently skeptical, however, the first test flight after installation proved all product claims. The climb to 17,000 feet lasted only 14 minutes and provided lower cylinder head temperatures, lower oil temperatures, and when leveled, trimmed and allowed to accelerate to 75% cruise netted an easy 7 knots IAS increase (since then flight at higher altitudes are about 12 KTS TAS faster). Hot days are a lot easier to live with now and cold days can really be a blast! Climb has improved by up to 25% and is rock solid steady all the way up to FL230. It is clear that the engines are responding to cooler inlet temperatures and are putting out full rate power. There is no doubt in my mind that in the 1500+ hours since the American Aviation System has been installed we have enjoyed substantially improved performance and engine life. I would recommend ULTRAcooling to any 414 owner looking for increased performance. I believe this is the most cost-effective mod available for the 414." Randy Cooper, Cessna 414 Corporate Chief Pilot Richard C. Rein Cessna 414 Owner/Pilot "We installed American Aviation ULTRAcoolers on our 1976 Cessna 414 in early December and are delighted with the results. We would like to report to you that we climbed 16,000 feet to FL190 at 120 knots, fully grossed, 8 degrees celsius average temperature at the rate of 850 feet per minute for a total of 19 minutes. To my recollection, this is about a 36% improvement. The cruise speed improvement at 65% power at 16,000 feet through 19,000 feet appears to approximate your performance data. We have Micro Aerodynamics VGs on the Cessna 414 and we have simulated critical engine-out and found we can deep directional stability at 68 knots indicated and we were unable to flip the plane. We further suspect we can handle a greater useful load as the airplane climbs so much better. In short, due to the ULTRAcoolers and VGs, we have a whole new airplane." Richard C. Rein, Cessna 414 Owner/Pilot Back To 414 Page