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  1. koyama

    What can I do with my 582?

    I trimmed the quite above to the parts that I am going to specifically answer. It is true that there were very few engine choices during that time that were a good option for the Mini 500. But it cones down to one set of problems: Rotax specifically setup the 582 to drive a propeller, the...
  2. koyama

    What can I do with my 582?

    Your request for thoughts is hereby answered! Below are mine... I have heard many people claim that coatings could help the 582. This might be true. However, I have yet to see it demonstrated, and I can see far more problems than solutions. It is true that a coating could help with a hot spot...
  3. koyama

    What can I do with my 582?

    The 582 is a bad choice for the Mini 500. It is sad that the designer decided to go with this engine even though the factory claimed it was unsuited for the task. The 582 was intended to drive a propeller, not a rotor. With a rotor, all bets are off as to the reliability of the engine. There...
  4. koyama

    Simple six-pack replacement. Is there such a thing?

    It is true that the D-10 and D-100 have more capability than the 6 pack, but they are a direct replacement for it. Even new, they are cheaper than purchasing the same steam gauges new. If you are buying used stuff, it depends on the sources and conditions, but again, it is really difficult to...
  5. koyama

    Simple six-pack replacement. Is there such a thing?

    The reason I mentioned the D10A is that there is no shortage of them on the used market for ~$1200. That puts them in the zone where it is extremely difficult to home make anything cheaper, and if you consider your time, likely impossible. (I have about 12 of them, and I have never paid more...
  6. koyama

    Simple six-pack replacement. Is there such a thing?

    I am surprised that nobody mentioned the Dynon D10A. This is a complete, and self contained 6 pack replacement that is time proven to work. It can be setup as simple as 2 wires, power and ground, and 2 hoses, pitot and static, and you are done! It even has an internal backup battery to keep it...
  7. koyama

    Rotax 582 Alternative Possibility

    That is how I understood it. I was just using your quote to clarify that if reliability is the goal, building a one-off engine is not likely the right approach. I was getting the hint from other posts that the reason for not wanting a 2-stroke 582 was at least partially reliability. There are...
  8. koyama

    Rotax 582 Alternative Possibility

    I have seen this, however, I must point out that when driving a porpeller (not a rotor), there is no way to turn up a 582 10% and not give up flyability as I mentioned in some of my previous posts. (However, it is possible to turn one up ~10% and not give up reliability.) You are literally in a...
  9. koyama

    Rotax 582 Alternative Possibility

    You have to be careful with this, the problem is the risk of having an incorrect view of the situation. A 582 is actually very reliable and well proven. As I mentioned before, they have no real weak points, they fail because of user error. (It is the operator that is unreliable and unproven.) A...
  10. koyama

    Rotax 582 Alternative Possibility

    The only 4-stroke engine I have found that matches the weight and power of a Rotax 582 is the Weber MPE 750. If you look at this engine in detail it is obvious why. They did every trick in the book to get the weight down and the power up. The engine core is as good as you can get in this area, I...
  11. koyama

    Rotax 503 Question

    If it works, it works! I have heard many people say that they are ok, and I even examined on a 503 that someone cut the end off of one of the heads and mounted them 90 degrees so the fins were parallel with the air flow and no cowling was used and it was on a pusher. The engine obviously had...
  12. koyama

    Rotax 503 Question

    I have yet to see a 503 that is free air cooled live very long. If the problem is not overheating from too little flow, it is shock cooling from too much. The fan works best, the cooling goes up and down as a function of RPM, and in a plane, that is near in proportion to the throttle setting. It...
  13. koyama

    Rotax 582 Alternative Possibility

    While I agree with you that the stock exhaust provides some muffling, it is not anywhere as good at muffling as it is at its intended purpose, tuning. This document as well as my direct experience seem to disagree with your statement that it is just a muffler. All indications show that it is a...
  14. koyama

    Rotax 582 Alternative Possibility

    Putting fuel into the throttle body/intake is a way to cool the lower half of the engine, in particular the bottom of the piston. A large portion of the cooling that a 2-stroke engine gets is from the fuel. The reason I used the 447 for my GDI experiment is because I calculated that it was not...
  15. koyama

    Rotax 582 Alternative Possibility

    The problem with the stock firmware is that it has several safe and limp modes that have a hair trigger. Also, the fuel tables seem to have a narrow range. If you change the exhaust much, it is extremely easy to cause the computer to flip to safe/limp mode. The safe/limp mode is not desirable...
  16. koyama

    Rotax 582 Alternative Possibility

    ... Moderator Edit ... [EDIT Member Name] ... let's start with respect. Your reply is not setting the right tone for this. This is not a place for disrespect, we all friends here, and we are all after the same goal, to fly cheaply and safely. We are examining differences between aviation and...
  17. koyama

    Rotax 582 Alternative Possibility

    I currently own 4 planes that are setup with the 618, and I have owned a total of 11 618s. About half of them have ever had control cables installed. I have never been flying a plane that experienced a 618 failure of any kind, (my logs show I have 3122 hours with a 618) so I do not have direct...
  18. koyama

    Rotax 582 Alternative Possibility

    That statement is not correct. Look at my previous messages where I explained its operation.
  19. koyama

    Rotax 582 Alternative Possibility

    The cables do not actually actuate the valves. They only change the curve (pressure) at which the valves are actuated. With or without cables attached, the valves function throughout their full range. Most non-aviation (sled and ski) engines that have RAVE installed do not even have control...
  20. koyama

    Rotax 582 Alternative Possibility

    The Rotax 618 has a variable exhaust valve (RAVE) that helps flatten the torque curve that literally makes it suitable for driving a prop. If the valves get stuck, (common with incorrect oil) they hunt all over the place. Also, the 618 features a different looking stock exhaust, but it is setup...
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