Recent content by Longboy

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  1. Longboy

    Threading a long rod and keeping it straight.

    That is the right answer! Laying the book down and doing the set task with the tooling one has available most likely will get you there. Easy set up to try. No need to make or purchase specialize holders. Will not be a time / cost consideration if results are not satisfactory for this part...
  2. Longboy

    Smallest petral Engine

    The Guvment gonna screw up this tech idea when they notify you to take your watch to the jeweler for a yearly emissions test.
  3. Longboy

    Threading a long rod and keeping it straight.

    That was my best guess.....larger machines make these small dia. rounds & rods look frail. Brass rod can get the twisty in threading. Shouldn't have any axial load as the die drawing on the brass rod pulls the tail stock forward but may depend on the weight and drag of your machine tool size...
  4. Longboy

    Threading a long rod and keeping it straight.

    Reverse procedure. Put your Jacobs in the tail stock. Your brass rod in the chuck and the die in the 3 jaw chuck in head stock. Automatically squared up, stock to die. Power up after releaseing the tail stock from the ways. At least, this works well for smaller mini lathes.
  5. Longboy

    New ..

    Is your engine block in steel Minh? What does it weigh as is?
  6. Longboy

    Compression Testing

    A rubber tip blow off nozzle works well for models identifying leakage areas.
  7. Longboy

    Newbie Question - Intake Valve Stem Clearance

    You can isolate and determine compression leakage as well as porting leakage with a blow off nozzle for your air compressor. For your intake valve stem, at the carb mount to the manifold give it a blow through at a few pounds PSI and see what flies up that valve stem. A running engine with...
  8. Longboy

    Odd Camshaft design idea

    No tube. I use a 3/16 in. or 1/8 in. dia. CR shaft. The lobes start out upon either 5/16 in. or 3/8 in dia. CR stock. Locked to the shaft with #4 or #6 set screws.
  9. Longboy

    Odd Camshaft design idea

    That works for me well. I make the cams lobes as a separate unit from the shaft for my engines. Then you can position the lobes over the valve or under the lifter to any timing spec you need and can vary cam timing at will to see how the engine responds.
  10. Longboy

    Temporary attachment intake/exhaust pipes

    The worst you can do is solder the flange to the heads. The heat will not bother them. I think your solder will melt right off the exhaust side running the engine though.
  11. Longboy

    Longboy's "SIDE SHAFTER" Model Gas Engine.

    Using model airplane carbs in the .15 size for most of my gas engines. They work fine in engines beyond their purposed thimble size displacement @ 15K RPM. Adaptable for my purpose, the settings more than what I need. You play with the air throttle and fuel mix screws as well as set the...
  12. Longboy

    LONGBOY'S "JUSTABLE" MODEL GAS ENGINE!

    Welcome to Longboy's "JUSTABLE" engine presentation! An inline 360 twin. 1x1 inch bore & stroke. Work began on JUSTABLE 1st week of March. And completed 2nd week of April (5 weeks) Special features! Cantilever frame construction. Projected floating crankshaft. See it...
  13. Longboy

    Longboy's "SIDE SHAFTER" Model Gas Engine.

    Yes. Fixed air jets and variable fuel.....no throttle.
  14. Longboy

    Longboy's "SIDE SHAFTER" Model Gas Engine.

    The fuel mixer works well. Swapped it between a twin and SIDE SHAFTER and got the same response. I made a duplicate right away and tried out on another couple of twins. The venturi is 5/32in. bore. The brass air jet for this engine is drilled 1/8 in. currently. With the needle near closed it...
  15. Longboy

    LONGBOY'S "JUSTABLE" MODEL GAS ENGINE!

    Working on the under framing. This set up not giving me enough clearance for the flywheel. Going with a couple of skid members and transverse bars with the rubber feet. Another week or so to go..........and then it looks like it is finished! :) Some changes, trouble shooting, photos and...
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