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From: EPI Inc. Contact: [email protected] Race Engine Technology Magazine CURENT ISSUE Contents BACK ISSUE Summaries SUBSCRIBE Wednesday, June 10th, 2015 Reversing the Rotation of the Crankshaft Sometimes it's worth the effort In some cases of engines with reduction units to drive the propeller, it can be an advantage to have the crankshaft rotate in the opposite direction as the propeller. (For a complete discussion of that subject, see Prop Rotation .) For example, the GTSIO520 crankshaft turns in the opposite direction of a standard, directdrive IO 520, because the gear reduction unit on that engine is a singlemesh type, in which the output shaft rotates in the opposite direction of the input shaft. By reversing the crankshaft rotation, the GTSIO520 can use the wide range of available propellers designed for clockwise (from the cockpit) rotation. Reversing the direction in which the crankshaft of a given engine rotates is not particularly difficult. But reversing the engine can add considerable extra expense because of the nonstandard pieces needed, including: 1. a special crankshaft with the rodjournal oiling passages drilled to the opposite side of the rod throws in order to support the reversed bearing load phasing, 2. a special camshaft because reversing the crankshaft reverses the firing order (no, you can’t just use a geardrive to run the cam in its normal direction, and running it backwards opens the intake during the exhaust cycle and the exhaust during the intake cycle), 3. special accessory drive provisions, 4. reverse rotation crankshaft seals, 5. speciallyengineered oil pan (especially critical in dry sump systems); 6. reverserotation starter and alternator, 7. and a host of other details depending on the ignition and oiling systems used. Given those factors, keeping the standard crankshaft rotation (clockwise viewed facing the waterpump end of the engine) and using a gearbox with an idler to maintain that direction of prop rotation will appeal to some builders. << Return to: Contents Go to: Top of Page ↑ Next Subject: Electronic Control of Engines >> •Home •About EPI •Site Map •Contact Us • DISCLAIMER: EPI Inc. and the contributors and reviewers of the material presented on this website have confidence that every effort has been made to ensure the accuracy and completeness of the information available, but we cannot be responsible for any errors or omissions. Your use of the website and any of the available information indicates your understanding and acceptance of these terms. EPI Inc. is not liable to any party for any direct, indirect, special, or consequential damages resulting from use of any information on this website. Copyright © 2012 EPI Inc, All Rights Reserved

Reversing the Rotation of the Crankshaft, By EPI Inc

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  • 6/10/2015 ReversingtheRotationoftheCrankshaft,byEPIInc.

    http://www.epieng.com/piston_engine_technology/reversing_engine_rotation.htm 1/1

    From:EPIInc.Contact:[email protected]

    RaceEngineTechnologyMagazine

    CURENTISSUEContentsBACKISSUESummariesSUBSCRIBE

    Wednesday,June10th,2015

    ReversingtheRotationoftheCrankshaftSometimesit'sworththeeffort

    Insomecasesofengineswithreductionunitstodrivethepropeller,itcanbeanadvantagetohavethecrankshaftrotateintheoppositedirectionasthepropeller.(Foracompletediscussionofthatsubject,seePropRotation.)

    Forexample,theGTSIO520crankshaftturnsintheoppositedirectionofastandard,directdriveIO520,becausethegearreductionunitonthatengineisasinglemeshtype,inwhichtheoutputshaftrotatesintheoppositedirectionoftheinputshaft.Byreversingthecrankshaftrotation,theGTSIO520canusethewiderangeofavailablepropellersdesignedforclockwise(fromthecockpit)rotation.

    Reversingthedirectioninwhichthecrankshaftofagivenenginerotatesisnotparticularlydifficult.Butreversingtheenginecanaddconsiderableextraexpensebecauseofthenonstandardpiecesneeded,including:

    1. aspecialcrankshaftwiththerodjournaloilingpassagesdrilledtotheoppositesideoftherodthrowsinordertosupportthereversedbearingloadphasing,

    2. aspecialcamshaftbecausereversingthecrankshaftreversesthefiringorder(no,youcantjustuseageardrivetorunthecaminitsnormaldirection,andrunningitbackwardsopenstheintakeduringtheexhaustcycleandtheexhaustduringtheintakecycle),

    3. specialaccessorydriveprovisions,4. reverserotationcrankshaftseals,5. speciallyengineeredoilpan(especiallycriticalindrysumpsystems)6. reverserotationstarterandalternator,7. andahostofotherdetailsdependingontheignitionandoilingsystemsused.

    Giventhosefactors,keepingthestandardcrankshaftrotation(clockwiseviewedfacingthewaterpumpendoftheengine)andusingagearboxwithanidlertomaintainthatdirectionofproprotationwillappealtosomebuilders.

    HomeAboutEPISiteMapContactUs

    DISCLAIMER:EPIInc.andthecontributorsandreviewersofthematerialpresentedonthiswebsitehaveconfidencethateveryefforthasbeenmadetoensuretheaccuracyandcompletenessoftheinformationavailable,butwecannotberesponsibleforanyerrorsoromissions.Youruseofthewebsiteandanyoftheavailableinformationindicatesyourunderstandingandacceptanceoftheseterms.EPIInc.isnotliabletoanypartyforanydirect,indirect,special,orconsequentialdamagesresultingfromuseofanyinformationonthiswebsite.Copyright2012EPIInc,AllRightsReserved


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