User manual MVVS 58 IRS PROSPORT V1.7

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Manual abstract: user guide MVVS 58 IRS PROSPORTV1.7

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[. . . ] Operating instructions MVVS 58 IRS No: 3001L MVVS 58 IRS Prosport No: 3001P MVVS 58 IRS Limited Edition No: 3001LE Before using the engine, please read these instructions carefully. Congratulations on choosing the gas engine MVVS 58. MVVS 58 has been designed and manufactured for propeller-powered radio-controlled model planes. It is able to meet all of your expectations of an acrobatic racing engine. Technical specifications Bore Stroke Weight of complete engine without ignition* Weight of ignition unit 42 mm 42 mm 1820 g 165 g Maximum power output ** Maximum torque ** Fuel Lubrication RpM range 8. 5 HP / 6950 RpM 8. 8 N/m / 6600 RpM Unleaded 95-octane fuel Oil with petrol in mixture 1:40 1000 ­ 7500 RpM * Some manufacturers state the weight of incomplete engines. The value in the table above stands for the weight of a completely assembled engine, including the spark plug, carburetor, drive washer and prop screws. [. . . ] Engine power output is also a variable quality. It depends above all on the silencer used and can considerably vary. The situation is further complicated by environmental parameters (temperature and atmospheric pressure in particular): low temperature and high pressure increase propellers' input requirements by 20% in comparison with input in a hot weather. Suggested propeller dimensions: two-blade: 22x10, 22x12, 22x14 24x8, 24x9, 24x10, 24x12 25x7, 25x8, 25x9, 25x10, 25x12 26x7, 26x8, 26x9, 26x10 22x10, 22x12, 24x9, 24x10, 24x12 three-blade These values are only approximate and may vary with the factors described in the previous section, as well as with the type of the exhaust system used. MVVS 58 has been designed to generate maximum power at 6800 ­ 7100 RpM, according to the type of exhaust used. If you wish to utilize the maximum power output, choose a propeller, which allow the engine to reach these revolutions, or slightly lower revolutions (given the unloading of the propeller depending on the speed of flight) on the ground. We do not recommend using propellers with which the engine reaches more than 7500 RpM on the ground. Exhaust Use only factory-made exhausts pipes designed for this type of engine, preferably brand-name MVVS engines with which you also get the power output guaranteed. The manufacturer declines all responsibility for all engine damages arising from the use of improper exhaust systems. When mounting the exhaust follow the manufacturer's instructions. Make sure to secure sufficient cooling of the exhaust. Carburetor adjustment Basic setting: (The values are derived from the position of clock-hands) - adjusting needle (L) for low revolutions range 1turn and 45 min - adjusting needle (H) for high revolutions range 1 turn and 10 min The new engine comes adjusted to the basic setting. This setting should be kept during running the engine in! After the engine has been run in, adjust it following the instructions below: - start the engine and warm it up - let the engine run at idle speed for approx. 5 seconds If the engine starts to run backwards do not open the throttle - stop the engine immediately!Step I Accelerate to 2/3 of the throttle range within approx. Repeat three times ­ if the engine accelerates quickly and without a hiccup go to Step III. If acceleration is not smooth go to Step II. Step II Air pressure inlet Adjusting needle (H) Adjusting needle (L) Choke lever Faulty acceleration with hiccups and a tendency to cut out is usually attributable to a poor fuel mixture in the medium-revolutions range. Stop the engine and recheck the fuel feed (the hose-pipe must not be pinched or broken; if fitted, check also the fuel filter permeability). Restart the engine and test acceleration again. If problems persist adjust the carburetor. Open the adjusting needle L by 5 min and retest acceleration. If acceleration is smooth, open the needle by another 3-5 min - this should be done because the needle was previously set at a boundary value; if atmospheric conditions changed during flight, the problems might recur. If the engine still has bad acceleration, open the needle by 10 min (60 degree). [. . . ] If even after the fourth turn, with the choke valve closed, you do not hear a suggestion of the engine starting, give the engine 2 turns following the instructions in paragraph 1 above. Then proceed according to instructions given in paragraph 2. 3) If the engine does not start even after another set of turns open the throttle to maximum and give the engine approx. Switch the ignition off and on again and restart the engine with throttle turned slightly down and the choke valve set open. [. . . ]

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