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powerplants. The Cirrus SR22 is the newest airplane to benefit from RAM’s special focus. The complete service center at Waco installs many aftermarket products, such as speed brakes, VG’s and strakes. While twin Cessnas are the best-known recepients of RAM’s attention, modification work is done on other aircraft as well.RAM began with removing the non-intercooled 285-hp TSIO- 520-K engines from early 340s and installing the intercooled 310-hp TSIO-520-N found on the Cessna 414. Cessna followed by later by installing an intercooled TSIO-520-N engine of 310 hp and redesignating the airplane a 340A. RAM again modified its installation to 325 hp and obtained a 300-lb gross weight increase, still found on the Series IV STC.In 1979, the VAR (vacuum arc remelt) crankshafts became available, and after Continental improved the cylinders, pistons and exhaust valve lifters the TSIO-520-NB’s TBO was increased from 1,400 to 1,600 hours. RAM modified these engines to produce 335 minimum horsepower, creating the Series VI. Using 41 inches maximum manifold pressure and improved intercooler scoops, another 100 pounds of takeoff weight increase was obtained.By 1999, further improvements became possible, and the TSIO-520- NB was given a larger intercooler and a bigger turbocharger, permitting 335 hp to be obtained with only 38 inches of manifold pressure. This is the Series VII RAM mod, currently the best available.There are still Cessna 340’s flying with the 285-hp engines, available at much lower prices in their unaltered state. RAM, of course, intends to convert them all, bringing every 340 into a higher level of utility.Information: RAM Aircraft, LP, 7505 Karl May Drive, Waco Regional Airport, P.O. Box 5219, Waco, T•exas 76708, (254) 752-8381, fax (254) 752-3307, www.ramaircraft.com T&TAUGUST 2012TWIN & TURBINE • 15