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  1. #1
    Senior Member andy dixon's Avatar

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    help wanted whats the difference between rotax 377 and 447

    i have a rotax engine sat on the bench,is it a 377 or a 447, how do i tell which one it is without taking the top off and measuring the bore and stroke ?
    been on the internet for 2 hours and still baffled
    ......also are they the same gasket set ?
    Last edited by andy dixon; 11-12-09 at 23:30 PM.
    disclaimer....as per 2010 European libel act....these are my thoughts only and may not represent the thoughts or actions of any person /company/group/manufacturer named in this article/Internet posting

  2. #2
    Senior Member Frank Thorne's Avatar

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    What are you using them for Andy?

  3. #3
    Senior Member andy dixon's Avatar

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    it's on a flexy but to insure it i need to know which engine it is,there is an engine tag but unable to read, the looks/condition of the engine is much different to the looks of the rest of the plane.......indicating it may not be original
    disclaimer....as per 2010 European libel act....these are my thoughts only and may not represent the thoughts or actions of any person /company/group/manufacturer named in this article/Internet posting

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    Senior Member Frank Thorne's Avatar

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    http://www.ultralightnews.com/rotaxinfo/rotax447.html

    447 Pic and specs

    just need 377 now

  5. #5
    Senior Member Frank Thorne's Avatar

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    Theres a pic of the 377 but cant link it on same site



    Rotax 377 engine data.

    Rotax Engine Rebuilding Videos
    Rotax engine rebuilding videos, each video is approximately 2 hours in length and takes you step by step through the tear down, clearing, and reassembly of a Rotax engine
    Click here for more information!

    Rotax 377 engine specifications.
    DESCRIPTION: Two-cycle, two-cylinder engine, oil in fuel lubrication
    BORE: 62. mm
    STROKE: 61 mm (2.40 in.)
    DISPLACEMENT: 368. cc
    COMPRESSION RATIO: Theoretical 9.6, effective 6.3
    POWER OUTPUT: 29.5 kw (35 HP) at 6000 rpm
    TORQUE MAX.: 25 ft lbs. @5500 rpm
    MAXIMUM RPM: 7000 RPM
    DIRECTION OF ROTATION: Counter-clockwise, viewed towards PTO
    CYLINDER: 2 light alloy cylinders w/ cast iron sleeves
    PISTON: Aluminum cast piston with 2 rings
    PISTON/CYLINDER CLEARANCE: 0.08- 0.09mm (.00315-.00354 in.)
    IGNITION SYSTEM: Bosch with points and condensers
    GENERATOR OUTPUT: AC 12V 110W + 30W
    RECTIFIER-REGULATOR:
    (optional) a.) #9103 requires minimum load 12 W (1 amp.)
    b.) #9251 requires no minimum load
    IGNITION TIMING: 2.09 mm = .086" BTDC
    CONTACT POINT GAP: 0.4 mm = .015"
    SPARK PLUG: 12mm NGK B8ES
    ELECTRODE GAP: .015" GAP
    CARBURETOR: 1 X BING 36mm, with hand lever choke
    FUEL PUMP: pneumatic fuel pump #6903
    FUEL: Regular gasoline, octane not below 90 unleaded
    LUBRICATION OF ENGINE: Super two stroke oil (AV-2)
    MIXING RATIO: 50 TO 1 (2%)
    STARTER: Rewind starter
    optional: electric mag side without recoil option
    REDUCTION GEARBOX "B": Reduction gear-box with Torsional shock absorber
    RATIOS: 2.00 to 1, 2.238 to 1, 2.58 to 1
    DIRECTION OF PROP ROTATION: Clockwise, viewed toward prop flange
    COOLING: Air cooled by axial fan
    WEIGHTS: Engine without carburetor, intake silencer, fuel pump
    Exhaust System......................
    Carb With Rubber Socket......... 2.0 lbs.......( 0.9 kg.)
    Exhaust System (approx.)......... 10.8 lbs.......( 4.9 kg.)
    Electric Start Kit (Optional)..... 7.70 lbs.......( 3.5 kg.)
    Reduction Box "B" - Dry.............9.9 lbs.......(4.5 kg.)
    Click here for performance and measurements.

    Rotax 377 engine data.

  6. #6
    Senior Member Frank Thorne's Avatar

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    They look identical so have fun.....

  7. #7
    Senior Member andy dixon's Avatar

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    it's a 377,just had a lazer measuring tool down the plug hole. it sends a dopler beam both ways and measures the distance......62mm so it has to be a 377. the d.v.l.a. must have paid about 10 grand for this machine and this is the first time it has come in useful.
    thanks for the help frank ! i knew some one would know where to find the info.........cheers
    disclaimer....as per 2010 European libel act....these are my thoughts only and may not represent the thoughts or actions of any person /company/group/manufacturer named in this article/Internet posting

  8. #8
    Senior Member Rick Moss's Avatar

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    What's the flexi? Sounds interesting and SSDR-like...

  9. #9
    Senior Member jonkil's Avatar

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    Thumbs up

    Quote Originally Posted by andy dixon View Post
    it's a 377,just had a lazer measuring tool down the plug hole. it sends a dopler beam both ways and measures the distance......62mm so it has to be a 377. the d.v.l.a. must have paid about 10 grand for this machine and this is the first time it has come in useful.
    thanks for the help frank ! i knew some one would know where to find the info.........cheers
    I was just about to suggest you measure the stroke with a vernier caliper... you beat me to it with one of "007's" Q inventions !... well done.

    Jon

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