Experimenter

December 2012

Experimenter is a magazine created by EAA for people who build airplanes. We will report on amateur-built aircraft as well as ultralights and other light aircraft.

Issue link: http://experimenter.epubxp.com/i/96284

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Tis metal throttle position sensor (TPS) was the most secret part of the new sixcylinder engine and was specially developed for the new engine. It is much shorter than the older sensor, has double exits, and no moving parts that are in direct contact inside. Te new TPS (shown on the lef here) is already mounted on the throttle body. On the right in this photo is the older sensor used on four-cylinder engines. Te position of the butterfy valve is no longer determined by the position of the rotating fnger on a sliding arch; instead it is now contact-less. All ULPower four- and six-cylinder engines are nearly identical and are modularly built. Their cylinders have the same bore of 105.6 millimeters, and only the stroke is different—74 millimeters for the 260 while the 350 models are 100 millimeters, with 2.6 and 3.5 liters respectively. The multiplication of models is obtained with two different compression ratios of 8.16-to-1 and 9.10-to-1, which result in approximately a 10-hp difference from the low to high compression models. The same process will be done with the six-cylinder engines that all use the same components as the four-cylinder models but have two more cylinders. That means that the now-in-production UL520i/ Tis is the piston and piston-rod of the entire ULPower family of engines. iS engine that derives from the UL350 has either 180 hp (low compression) or 200 hp (high compression). The six-cylinder version of the four-cylinder UL260 engine is called the 390 (i/ iS) and will develop 140/160 hp (high/low compression game, again) once in production. This engine is not yet fully tested and will probably be on sale soon. Installed weight of the UL520i/iS is 242 pounds, and like the popular UL260/UL350 line (weighing 159/225 pounds), the new engines are direct drive, horizontally opposed, and air-cooled with electronic ignition, and multiport fuel injected FADEC (full authority digital engine control). Weight difference between the four- and six-cylinder engines with the same fractional (single cylinder) volume is from 8 to 10 kilograms. ULPower Engines UL260i UL260iS UL350i UL350iS UL390i UL390iS UL520i UL520iS Displacement 2,592 cc 2,592 cc 3,505 cc 3,505 cc 3,900 cc 3,900 cc 5,200 cc 5200 cc Compression 8.16:1 9.1:1 8.0:1 8.7:1 8.16:1 9.1:1 8.0:1 8.7:1 Max Torque 207 Nm 240 Nm 305 Nm 320 Nm 320 Nm 370 Nm 425 Nm 465 Nm Max Power 97 hp 107 hp 118 hp 130 hp 140 hp 160 hp 180 hp 200 hp Alternator Output 30A 30A 30A 30A 50A 50A 50A 50A Fuel Types 95ron/98ron/ 100LL 98ron/100LL 95ron/98ron/ 100LL 98ron/100LL 95ron/98ron/ 100LL 98ron/100LL 95ron/98ron/ 100LL 98ron/100LL 72 kg 72 kg 78 kg 78 kg 100 kg 100 kg 108 kg 108 kg 13,100.00 14,100.00 16,800.00 17,500.00 21,250.00 22,250.00 26,250.00 27,250.00 Installed Weight Price Photography by Marino Boric EAA EXPERIM ENTER 25

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