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Thread: bad engines


  1. #126
    aspeed's Avatar
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    RE: bad engines

    Even the LA .10's are the same design carb except for the remote needle, still, as is the AP .09. The latest old style loop scavenged OS .10 goes about the same as the later LA. Fairly good. The later one has a muffler I think. I have the .15 and it is that way. I think we lost the original poster.

  2. #127
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    RE: bad engines

    I don't think he figured it was such a subjective question.
    Sorry I'm late dear, I had to help my uncle Jack off his horse.

  3. #128
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    RE: bad engines

    ORIGINAL: aspeed Even the LA .10's are the same design carb except for the remote needle, still, as is the AP .09.* The latest old style loop scavenged OS .10 goes about the same as the later LA. Fairly good. The later one has a muffler I think.* I have the .15 and it is that way. I think we lost the original poster.
    My Enya .09-III TV has an idle air bleed screw, so does my Thunder Tiger GP-07.

    Here's the original poster:
    ORIGINAL: chuckaluck any brand of airplane engines i should stay away from?
    The subject of engines is a very broad one. In conclusion, I'd say that there are defects in nearly all brands, and one can't single out one brand. So, I don't know if the OP's question ever truly got answered.
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  4. #129

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    RE: bad engines

    I just noticed some comments about a certain brand of four stroke engines being hard to start and backfiring and throwing props. I remember seeing this with many 4s, not just the mentioned brand, back in the early days. Seems to me Lee adressed the issue in one of his columns. He seemed to feel the issue was due to the owners, not the engines. IIRC, his idea was the problem was mainly due to too big or small a prop, Nitro and oil percentage other than asked for in the instructions, and people setting the needle way too lean trying to get a high peak RPM beyond the engines capability. Also there might have been problems with setting the valves wrong. His recommendation was to follow the mfgers guidlines for prop size, plug, fuel oil and Nitro, and to use a tachometer because these engines don't have the same sound changes the 2s do. Slight differences in sound with RPM changes are too fine for most people to notice.
    After the column came out, several, not all people in the clubs locally trying to use these engines followed the column, and had the troubles drop to almost 0. In fact, for a number of years, my club hosted the 1/4 scale pylon races, everybody used a common fuel, and everybody used a tachometer to set the mixture, using RPM rather than sound. I don't ever recall any of those racers experiencing throwing props or backfiring. In fact, I think the particular brand was in over 2/3 of the planes.

  5. #130
    Moderator blw's Avatar
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    RE: bad engines

    Those 2 engines mentioned are high compression 4 strokes, and they would throw props if too lean.
    The ultimate responsibility of pilots is to fulfill the dreams of the countless millions who can only stare skyward...and wish.

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  6. #131
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    RE: bad engines

    ORIGINAL: GallopingGhostler

    You seem to forget Mr Cox, this mid 1960's technology engine was targeted for those mostly flying single channel airplanes with auxiliary throttles.
    Well, that is exactly my point. Just because it was good enough at the time, doesn't mean that it works well. Before the carb they offered a choke on the OS PET, and that worked well enough at the time compared to no throttle at all.

    You do need and adjustable low end, and OS had that on all of their other engines, i.e. .15 and up. You can put a .15 carb in the .10 engine and get a better low end, simply because it is adjustable.

  7. #132
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    RE: bad engines


    ORIGINAL: MJD

    I don't think he figured it was such a subjective question.



    When I first saw the title title of this thread, I thought...Hmmm, this should be verrrryyyy interesting (remember Arte Johnson on Laugh In? )

    It is...
    < Wrongway Feldman's Kreider-Reisner KR-21...(on Gilligan's Island)

  8. #133

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    RE: bad engines

    If your just getting into this hobbie stay away from glow and go GAS! So much better

  9. #134
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    RE: bad engines

    ORIGINAL: Mr Cox
    ORIGINAL: GallopingGhostler You seem to forget Mr Cox, this mid 1960's technology engine was targeted for those mostly flying single channel airplanes with auxiliary throttles.
    Well, that is exactly my point. Just because it was good enough at the time, doesn't mean that it works well. Before the carb they offered a choke on the OS PET, and that worked well enough at the time compared to no throttle at all.

    You do need and adjustable low end, and OS had that on all of their other engines, i.e. .15 and up. You can put a .15 carb in the .10 engine and get a better low end, simply because it is adjustable.
    Well this is interesting. The engine works fine for me. It idles fine. Come to think of it, I mounted it sidewinder fashion on a SureFlite 40" foam Piper Cub, and worked fine on its side. So, it is my favorite engine. I have 2 of them, and the OS Max .10R/C flies fine WITHOUT AN AIRBLEED SCREW.

    So, if you needed to modify yours to make it work for you, more power to you.

    I have told you my personal experiences with it, so if you don't believe me you are free to ignore me.
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  10. #135
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    RE: bad engines

    ORIGINAL: Mr Cox You can put a .15 carb in the .10 engine and get a better low end, simply because it is adjustable.
    I beg to differ, Mr Cox. Please see the attached photo. The .15 has a larger carburetor. It will not fit the .10. Come to think of it, neither does the OS Max 10LA have an air bleed screw (see photo).
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  11. #136

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    RE: bad engines

    I think the biggest problem with most engines is that really BIG nut in front of the prop!  (not the small one)
    Intelligence is similar to a dress code. Dont attend a black tie affair wearing cutoffs and a tank top. Know your facts

  12. #137
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    RE: bad engines

    Sometimes people do have bonafide problems with engines. Defects do happen. Once in a while a poor product is released that should have not, but you are right. Sometimes it is a poor selection of engine (bad engine/plane combo), poor choice of propellers, use of fuels / additives / propellers counter to the manufacturer's recommendations, etc.
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  13. #138

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    RE: bad engines

    To me, a bad engine is one that requires additional machining or a replacement of brand new factory original parts in order to make the engine run within expected parameters. This is especially true if the original misdesigned part could never have worked under any circumstances.

    I don't consider an engine bad if a part or two is malformed, but could have been made to work if manufactured as designed. That is a different matter entirely.

    Nor do I consider an engine bad if the manufacturer doesn't choose to gush over me on the telephone.


    Ed Cregger
    \"Practice makes prefect\"

    Saito Club Member #52

  14. #139
    GallopingGhostler's Avatar
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    RE: bad engines

    I received a Thunder Tiger GP-07 some time back that was missing a glow head gasket. I immediately contacted the hobby shop that I ordered it from, they mailed me a gasket.
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16

  15. #140
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    RE: bad engines


    ORIGINAL: vicman

    quote:

    ORIGINAL: Daniel-EL


    quote:

    ORIGINAL: GLGofLB

    Stay away from MECOA = PU


    Never owned one, but I thought the fix was to use 0% nitro fuel?
    Sling it against the wall, it will be cheaper.

    My reference was to the older Saito's.
    Glow Head Brotherhood #15

  16. #141
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    RE: bad engines


    ORIGINAL: jessiej


    ORIGINAL: jeffie8696

    Iwondered how long it would take to turn into a slugfest. [img][/img]
    Funny how a light hearted pastime can generate such passion and intensity isn't it? But wait, we haven't even touched on castor vs synthetic, ATR or build vs ARF yet!

    ess

    This is nothing compared to glow VS electric.
    Glow Head Brotherhood #15

  17. #142
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    RE: bad engines

    Oh yea, and not just the airplane guys either, the car guys can get very passionate about it.
    Me. I aint prejerduuce iether way.
    You should see a Traxxas Stampede with a 3900KV brushless and a 3S lipo on it.
    Club Saito # 677-Team Boca Bearings-Star Collectibles Muscatine-Glowhead Brotherhood #19

  18. #143
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    RE: bad engines

    Well as to "Bad Engines"...

    1. DEEZIL - poor fits and cheap, every once in a while one of the engines would actually work and run OK and confuse everyone else

    2. GHQ - sparker that ran clockwise,  it had a reverse prop on some of the engines that came with a prop. Like the DEEZIL it was cheap and poor fits, later engines actually had a stamped steel piston. Sometimes one would actually run also confusing people too.

    3. Thor, Synchro, Buzz, Rogers, Bullet   - slag engine.. low cost cheap engines, .wore out in a couple of runs, I think this was where the term "Slag Engine" came from. The aluminum piston ran up and down in a soft  aluminum cylinder. The aluminum was scrap metal from unknown sources as was the unknown alloy used in the crankshaft as well.  Sometimes they had sheet metal stampings for the connecting rod too. They also coined the phrase, "If you got it to run, you wore it out already" with these engines too.

    4.  The Russian made ELF 1.5cc replica engines using incorrectly machined ABC cylinder piston sleeves. If the engine ran at all, it would heat up and lose compression and quit. Most of the engines didn't run though.
    Club Saito #722, Sig Kadet Brotherhood #80, GlowHead Brotherhood #14,
    AMA # 928076

  19. #144

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    RE: bad engines

    Elfin not Elf Earl.

    Besides of that, The russian Kometa MD5 which is clone of the older Super Tiger G21 if I got it right, is a thing of its own.
    Piston rings that never seat, a Piston much to heavy and a Crankshaft with an intake timing that makes it almost impossible to start.
    Thats all besides of the aut of angle machined Crankcase.. Have fun!

    Regards,

    Holm

  20. #145
    Moderator Hobbsy's Avatar
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    RE: bad engines

    Those high compression Saitos mentioned above do not require a fix, just a little respect. I have two of them and its been 10 years or more since either has kicked a prop loose.
    Farmall 240 the final issue of the Farmall C, Super C, 200, 230 series.
    122 Cu. In. 22 hp. A small tractor that would do big work due to its 10x36 inch rear tires.

    As competition improves products, the differences between them get smaller and smaller

    Club Saito member #5

  21. #146
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    RE: bad engines

    personaly i have had some bad luck with several super tigre's others i fly with loved them. []
    Sato club member # 588
    Once a Marine Always a Marine

  22. #147

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    RE: bad engines

    The two engines I've had the most trouble with are a Thunder Tiger .75 FS and a Super Tiger 2300. Both have flamed out at takeoff (several times) with not so pretty results. One brand of engine I would like to comment on are Aviastar engines from SIG. They are very reasonable and run really well. I'm sure if Consumer Reports rated model airplane engines, they would give them a "best buy" rating.

    Jeff

  23. #148

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    RE: bad engines

    In the almost 20years I have been in the hobby I have run Satio, Magnum, OS, Thunder Tiger,and Super Tiger. I had the best luck with OS
    and the worst with Magnum I would also rate Thunder Tiger and Satio as good engines also.
    Ira d

  24. #149

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    RE: bad engines

    All of the forementioned manufacturers have made good and not-so-good engines! In the real world, companies merge, liquidate, spinoff, and outsource production. Therefore, brand loyalty is yesterday's news....

    In general: stay away from racing engines and gasser engines, when you are first starting with IC power. The added complexity is absolutely fine for the advanced tuner, but will test a newcomers patience.

    It's also true that newer engines, in general, are made more cheaply. But, don't avoid an entire brand of engines, just because one person had one isolated, bad experience with one of their engines.

    Availabilty is my most important factor when chosing a powerplant. Cost and product support are also good factors to consider.

    I also try to work with OEM equipment, within reason, to combine orders and save on shipping costs and wait times. For example: I use OS and Thunder Tiger engines on Hobbico and Tower Hobbies airplanes, and E-flite motors on Blade helicopters, from Horizon Hobbies.

    If you are working with your LHS, then it is possible to exchange a lemon for a new engine, and not need to call a product-tech support line. Or, if you are dealing with an online retailer, then a RMA number should be sufficient.

    So, the bottom-line is to always stay away from the "other guys" engines, because that will only complicate your ordering process, and have you spending more time on the phone and less time flying.
    AMA# 919518
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  25. #150
    GallopingGhostler's Avatar
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    RE: bad engines

    Give me your tired, your poor. I'll find a home for those engines.
    George Hostler
    Clovis MADS AMA Club, Vintage R/C Society (VRCS)
    And we know love by this, that He laid down His life for us, and we ought to lay down our lives for the brethren. 1 John 3:16


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