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facthunter

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Everything posted by facthunter

  1. facthunter
    Geez skip, what has that got to do with any facts? . Nev
  2. facthunter
    Why would they want to do that with an engine that already has cooling problems and is not recommended to be used in Pusher situations . Nev
  3. facthunter
    He's one of my favourite people and a true Aviator well acknowledged by the US aviation fraternity. Nev
  4. facthunter
    I've tried hard to get details and what i get is some reinforcement of the crankcase and tapering the Parts where the crankshaft is pressed together so it's got more interference and torque testing to a higher figure. These shafts cannot be repaired. That is the factory statement. Nev
  5. facthunter
    The Rotax has very little flywheel effect so has to idle faster and you are better to stop it as most do, From minimum idle speed. Nev
  6. facthunter
    You could do that without directing it at ME personally. I try to deal in facts and not make it a personal thing unless in response to someone. We all want answers here. Engines are a major cost item in the scheme of things I've build and modified them all my life and done quite a bit of tertiary study as well. Really good ones are rare' Reciprocating motors will always be way behind Turbine ones. Nev
  7. facthunter
    The last line of your post is not called for Brendan and all the extra things beyond the crank is not relevant either. Any way you look at this crank it's a bit light on to be the basis of a hotted up engine.. IF I owned one I'd want to know how the stretching/ failing cylinder retaining studs are going to be overcome. When you only have 4 you don't want any failing.' When you weld the crank you make the rods non removeable forever. The big end eyes are not split or do they change that too.? I doubt there's room to do that and how do you weld that side of the crank web with a conrod there? Nev
  8. facthunter
    I have no idea why that came out in darker print. Nev
  9. facthunter
    Sorry for that but we brought up collectively the two engine types. I'm NOT a fast typer. IF you want to understand what I'm saying I think you will cope with it. Nev
  10. facthunter
    No process can be available to stop ruining the original heat treatment and pin fit. If there's any carbon in the parent metal it will cause a line of hardening near the weld edge. IF you anneal that out it goes soft and loses some of the clamping interference fit. Be interesting to ask Rotax what their opinion os about that and the FAA.. (they probably would not have a clue either. It's basic metallurgy and heat treatment lore. Nev
  11. facthunter
    . It would be better to have the extra small bolts for case joint stability but the other bolts are similar. They resort to using some pretty strong sealant on the Jab. The Continental 0-200 series has big bore sizes and less main bearings. Motors are never stiff and the cases are very strong on the bottom half. . Nev
  12. facthunter
    The Continental has big bolts too but also the smaller ones around the case edge. Your main bearing fits would have to be a bit on the tight side for that to happen. ANYONE Who welds up that kind of crank IS A DUMMY. It ruins the whole concept of a pressed up crank. Destroys the heat treatment of the original parts, distorts the whole thing and creates stresses.. It's a Bull$#!t idea full stop..Nev
  13. facthunter
    Don't weld It. That doesn't work. A Pressed up crank is an extra liability however you look at if. I would have done 1,000s of them in my lifetime. Nev
  14. facthunter
    Can't do any harm. A rebuilt motor, I always prime. Nev
  15. facthunter
    Hard to justify as most planes are not used a lot. There are other significant costs as well. Add them up and it will shock you. There's also plenty of hassles. Nev
  16. facthunter
    Pressed up cranks are highly strained when just sitting there . The later ones have a slight taper of the bit's that press together and a higher torque test figure which can only be done at the factory with NEW bits. Nev
  17. facthunter
    You can WISH things were so because that saves money or making decisions. Nev
  18. facthunter
    You can get TOLD lots of things. Todays synthetics mix with ordinary oils but are of more consistent quality. Most are made from " LNG." Nev
  19. facthunter
    Not a very big rudder on a Taylor mono. Nev
  20. facthunter
    Too much politics in Lawn Bowls. Nev
  21. facthunter
    You would expect so. Engines operated at higher power outputs have reduced TBO's Nev
  22. facthunter
    Same oil with additives and a shorter life. for multigrade. Nev
  23. facthunter
    Watch how they stop when shut down. A good motor will bounce back off compression. Nev
  24. facthunter
    It's crank run out or case warping causing those things. Not something you want or should have with any motor. Nev
  25. facthunter
    I wouldn't leave any U/L out in the weather, either. I wouldn't do it to a lawnmower. . Yes flying is DIFFERENT. There's nothing but aerodynamics keeping it up.Nev
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