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  1. O

    Limbach engines from China

    I will PM you a response, 1946. I don't want to highjack an engine thread with a digression on business practices.
  2. O

    Limbach engines from China

    If you're going to fly with a Chinese engine, please don't do it over my place. Maybe fifteen years ago, a big-name American tool company which had sold lots of side-grinders to American welders, decided that their top execs could get a lot more money out of their stock options by outsourcing...
  3. O

    What is the ultimate bush plane?

    Some more nominees: The Sherpa Pilatus Porter Fiesler Storch Convair L-13 (with a bigger engine) Citabria Cessna 185...
  4. O

    new to 2 stokes

    One thing you never want to forget with any pre-mix fueled 2-stroke machine, from weedeaters to chainsaws to motorcycles to airplanes, is that when the machine sits, the oil will gradually come out of suspension in the gasoline and settle to the bottom of the tank. However you do it, the tank...
  5. O

    Two Stroke Exhaust

    "addaon", are there really constant-speed props for these little engines? I ask in pure ignorance.
  6. O

    Two Stroke Exhaust

    I want to emphasize that I'm not promoting this as anything other than an idea to chew on; I'm not financially or emotionally tied to its adoption by anybody. Dana, what you say about aircraft engines likewise applies to racing outboards, which have no transmission, and which are propped to the...
  7. O

    Two Stroke Exhaust

    Here's an idea for you guys to ponder, which extends the rpm range of a pipe and which should reduce cracking of pipes and mounts: In outboard racing (you can see what I'm refering to by going to the American Power Boat Association site and looking at Professional Racing Outboard photos) it...
  8. O

    300ci inline six

    Go to the Ford Six Performance site, then Advanced Search, and looks for threads by a member named Von Writter. He is building a full-size Fokker D-7 replica and getting ideas for powering it with a Ford 300-six. I think he is pondering a centrifugal supercharger, which would be pretty close to...
  9. O

    The day the computers become intelligent.

    A staple of modern science fiction in movies and books is the day the computers achieve intelligence. And self-awareness. And begin to plot against us. Many worry about the coming of that day. But I await it eagerly. Because on that day, computers will be able to feel pain. And know...
  10. O

    ethanol and jetting

    You're right, Mark, better to drain the carb if it has a drain, like most Mikunis, than if it doesn't, like most old outboards and a lot of small engine carbs. Better yet, shoot some WD-40 into the carb and up through the drain hole, as well as in the sparkplug holes. If you have any way...
  11. O

    ethanol and jetting

    In this area, every company gets their gas from three local refineries. The refinery puts in a basic additive package. Each company/customer puts in a dye so that if they are ever sued, they can at least tell whether the "bad" gas was actually sold by them. The companies wishing to sell a...
  12. O

    ethanol and jetting

    Gasohol here is E10, that is, 90% gasoline and 10% ethanol. 91 octane pump gas is mostly still straight gasoline, but will become 91 octane gasohol by 2012. Ethanol has the pluses and minuses covered by others, but I'd think we can live with a 10% blend if we are careful: --Talk to the...
  13. O

    300ci inline six

    Another thought. Most stock factory water pumps for car engines are crap nowdays. It used to be that the pump impellers were cast iron and shaped for efficient operation. Now they are stamped steel in the interest of saving a few pennies. These stamped impellers are open on the back, cutting...
  14. O

    Tuned Pipe

    Rectangular pipes don't affect the speed of the acoustic waves, assuming the cross-sectional area and rate of increase in area is the same as the round pipe you're comparing it to. However, the surface area for a given cross-section is greater with any pipe shape other than round, therefore...
  15. O

    Tuned Pipe

    When was that, Wally? The last megaphones I remember at kart races was in the Sixties. And was the engine you saw a 2-stroke or 4-stroke?
  16. O

    Tuned Pipe

    Outboard racers have been using single expansion chambers on two (and four) cylinder engines for forty years. Saves weight and doesn't cut power much, compared with using one expansion chamber per cylinder. Here's one photo, of an opposed-four with two pipes (the same site has lots more photos...
  17. O

    Fuel price insanity: can we adapt?

    If fuel keeps going up, the outlook for hobby flying (and other motorsports) looks grim. Oh, the price of big, beautiful old birds like my favorite, the Cessna 190/195, will come back down into the reasonably affordable range, but only because actually flying them regularly will be...
  18. O

    Harley XL engine?

    Moto Guzzi and Ducati built fairly big 90 degree V-twins that are smooth running, if you run across one of those.
  19. O

    Re-Babbitting bearings

    Well, saw Marc again today, and he says that shell thickness makes a big difference. Call him at the shop next week during normal working hours.
  20. O

    Re-Babbitting bearings

    All I know is when I phone Marc, I have to start with the *82. He got tired of getting salesmen calling him all day. Anyway, I talked with him about this today, and told him he might get a call about it. Marc said he had done a few of this jobs of babbitting bearing shells, but he doesn't like...
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