LONGBOY'S "SUPER TEE" MODEL GAS ENGINE.

Discussion in 'Photos and Videos' started by Longboy, Nov 17, 2018.

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  1. Nov 17, 2018 #1

    Longboy

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    Getting hard to create new engine designs or layouts, something you haven't seen before. Maybe you've seen something like this! I can't find it on the Internet. Maybe this engine is something I can call my own then. So how bout a multi cylinder inline engine.....with a right angle crankshaft. I got the preliminary drawing right here.
    Tee.png
    The Super Tee's story starting this week!
     
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  2. Nov 19, 2018 #2

    Longboy

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    The frame is made up from aluminum angle. .250 in. 2x3 and 3x4 with a floor piece joining the bottom verticals. I may shorten the horizontal on the short piece depending on what I need to put on its top...... like distributor, fuel tank and such.
    IMG_2475.JPG IMG_2476.JPG IMG_2477.JPG
    6-32 SS socket heads hold it together.
     
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  3. Nov 21, 2018 #3

    Longboy

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    The vertical on the 3x4 angle gets a set of brass bearing carriers. A pair of R18ZZ bearings in each one.
    IMG_2479.JPG
    After the boring, fastened on with some 4-40 SS screws. You see here that the center bearing is about a quarter inch lower. The engineering explanation is........is.........well I dunno! Looked
    like the right thing to do at the time I guess.:D
    IMG_2480.JPG
     
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  4. Nov 21, 2018 #4

    ZebDog

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    I will be following this build. I have watched several of your engines run on youtube they all look and sound great
     
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  5. Nov 22, 2018 #5

    Longboy

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    All "geared" to proceed after the predetermined spacing of the bearing carriers in the previous post, I start with crank webs of 12L14 steel. These Traxxas spur gears will be piggy backed to the webs. IMG_2473.JPG
    These Nylon gears strong and durable for R/C cars with high torque motors will suit the needs of SUPER TEE for starter drive input, possible spark advance kickback and usual low RPM running.

    IMG_2474.JPG
     
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  6. Nov 24, 2018 #6

    Longboy

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    Three con rods were made from aluminum stock with a single R166ZZ bearing in the big end.
    IMG_2495.JPG
    Doing something different with the small end. Drilled for a 1/8 in. piano wire pin direct into rod. Has worked well on the big end on a couple engines now. The rotating crank webs should sling enough oil under the pistons for lubing the pin. If not, then I retro fit some R144ZZ's in place.
    IMG_2494.JPG
    And I already muffed up :( .....one of the rods needs to be .250in. longer for the center cylinder.
    ( :rolleyes: "pay attention Longboy"!) So now I got spare parts early in the project!
     
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  7. Nov 25, 2018 #7

    stanstocker

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    This looks like a really interesting build, nicely off the beaten track. Interesting use of modern off the shelf bearings and gears as well. Please keep posting, I've got questions but they would be jumping the gun. No doubt "All shall be revealed in the fullness of time" :)
     
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  8. Nov 25, 2018 #8

    a41capt

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    This looks really different. Watching with great interest!
     
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  9. Nov 26, 2018 #9

    Longboy

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    SUPER TEE was conceived as a twin originally. After finding the spur gears, the bore centerline spread allowed space for a third cylinder head over the crankshaft web and not crowd out the cylinder heads with a one inch bore, thin wall liner.
    IMG_2481.JPG
    Boring the deck, diameter plus of the DOM cylinder liners.

    Boring the radiators for their DOM cylinder liners.
    IMG_2482 (1).JPG
     
    Last edited: Nov 26, 2018
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  10. Nov 28, 2018 #10

    Longboy

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    I prefer the crank webs to this style of weight reduction for the primary balance of the piston/rod assembly over pie shape cutouts adjacent to the throw pin. On SUPER TEE, the webs will be out front and prominent in rotational view.
    IMG_2483.JPG
    With the max diameter bore thru, SUPER TEE is still short on its' testosterone and the piston/ rod hangs straight down.
    IMG_2487.JPG
    Shortening the piston shirt and removing metal from the beam helped some......but I needed more weight bias in the web. That solution begins here! IMG_2485.JPG
     
    Last edited: Nov 28, 2018
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  11. Nov 30, 2018 #11

    Longboy

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    An extra counterweight on the back side of the spur gear brings the assembly into primary balance. Splitting a steel disk in half and go from there.
    IMG_2488.JPG
    Needed about a quarter round for the job. All fasteners on moving assembles......blue Loctited.
    IMG_2490.JPG
    With the piston/ rod free spin in the bearing carrier now, balanced to my satisfaction in all clock positions. Test fitted to frame here with cylinder.
    IMG_2491.JPG
     
    Last edited: Nov 30, 2018
  12. Dec 2, 2018 #12

    Longboy

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    The radiators with 1 inch bore liners on the deck.
    IMG_2498.JPG
    2.25 in. diameter aluminum rounds become cylinder heads.
    IMG_2499.JPG
    They need a shave job to sit upon the radiators. IMG_2500.JPG
    To the mill to give them a butt fit over the cylinders then.
    IMG_2503.JPG
    And looking good! :)
    IMG_2504.JPG
     
    Last edited: Dec 2, 2018
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  13. Dec 3, 2018 #13

    GreggA

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    Cant get my head wrapped around this design....Where are you going with this?
    Love it1
    I'll be watching....Nice work1
     
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  14. Dec 3, 2018 #14

    Longboy

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    Thanks GreggA....I luv it! The mystery of SUPER TEE's layout is preserved. Most likely, when I get to the cam drive next weekend, you will see the arrangement. In the mean time......can a distributor drive a camshaft? :confused:
     
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  15. Dec 3, 2018 #15

    LorenOtto

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    Can't wait to see it.
     
  16. Dec 3, 2018 #16

    GreggA

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    Interesting question !
    I suppose, I mean, maybe, why not?
    Oh heck.....I dunno.
     
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  17. Dec 4, 2018 #17

    Johno1958

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    Lookin.....lookin........thinkin. I have a guess on some of it but grasping at straws :rolleyes:.
    The story will unfold.
    Cheers
    John
     
  18. Dec 4, 2018 #18

    Longboy

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    Six valve blocks where made, int. and ex. mounted to the side of the heads in a cross flow porting scheme.

    IMG_2505.JPG
    3/4 x 5/16 in. aluminum bar sandwich a brass valve guide. Blue painters tape between the pieces as a gasket. Some 3/16 in. brass tubing with an O-ring seal tap into the combustion chamber when drawn up by a pair of #4-40 screws.

    IMG_2506.JPG
     
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  19. Dec 4, 2018 #19

    GreggA

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    your just not going fast enough.....driving me the heck crazy.
    Nice work though!
     
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  20. Dec 6, 2018 #20

    Longboy

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    The intake valve bocks are reversed, valve upright for clearance of accessories and components found under the intake manifold. CM-6 spark plugs direct, upright center in the heads. #4-40 socket screws below the surface of heads thread into the radiators with my usual O-ring head gasket. IMG_2595.JPG
    The valve springs are purchased for the ex valves . Intake springs for atmospheric valves hand wrapped around a arbor shaft slow turned on lathe from some K&S .015 piano wire. Brass spring retainers are threaded onto the valves stems, 6-32 thread.

    Time for some fork legs as the cylinders mounted tip the frame over now.
    IMG_2594.JPG
     
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