Author Topic: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.  (Read 3149 times)

Offline Longboy

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #30 on: October 26, 2021, 05:37:42 AM »
Natural metal or black satin? I like contrast with dark deep color.



For radiators, the upper part of engine blocks get the fin cladding bolted on each side.



Wadda you mean, "It don't run"???

Offline RReid

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #31 on: October 26, 2021, 02:53:40 PM »
My vote would be the black satin. :ThumbsUp:
Regards,
Ron

Offline Kim

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #32 on: October 26, 2021, 06:05:11 PM »
The black satin certainly does make the brass pop!  :ThumbsUp:

Kim

Offline crueby

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #33 on: October 26, 2021, 08:17:32 PM »
Yes! The black with the brass looks great.

Offline Longboy

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #34 on: October 29, 2021, 06:06:58 AM »
Square four engines being a pair of 180 deg. crank twins, its cylinders in unison rise and fall diagonally.



The firing order is 1-2-3-4. Though I built the engine numbering the cylinders starting with the front left, the distributor with its gear drive rotates counter clockwise. The #1 cyl. is now the front right. This allowed for a symmetrical layout of the spark plug wiring from the cap.



Wadda you mean, "It don't run"???

Offline Longboy

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #35 on: October 31, 2021, 05:24:46 AM »
A 72T belt takes care of the cam drive. With sprockets instead of gears for the cams, that belt would have had around 400T.




More cylinders need more fuel capacity and up front I was able to have twin on board vertical fuel tanks totaling about 2 OZ. SQUARE FOUR idles along for over 20 minutes per fueling.



Copper tanks and mufflers, the red metal along with white and yellow metal.....my kind of jewelry!

Longboy's SQUARE FOUR concluding this week!    :cartwheel:
Wadda you mean, "It don't run"???

Offline Longboy

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #36 on: November 02, 2021, 07:20:48 AM »
Welcome to my introduction of my new engine, Longboy's "SQUARE FOUR" Model Gas Engine!    :popcorn:



Only found in the motorcycling world per my research, the Square Four found its way as a production motorcycle (Ariel), a racing motorcycle (Suzuki) and a production proposal motorcycle (Kawasaki). Now in a Google/ YouTube search on the web......as an obscure model engine, as are its full sized examples.



SQUARE FOUR was started second week of November. (2020)



Completed first week of March.



Very smooth performer. (see teaser photo for above photo early in postings)



20 minute run time per tank full.



Geared twin cams.



And geared crankshaft to central flywheel.



See it run! Thanks,  From LONGBOY ENGINE,   Dave.



« Last Edit: November 02, 2021, 06:04:30 PM by Longboy »
Wadda you mean, "It don't run"???

Offline ShopShoe

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #37 on: November 02, 2021, 12:29:28 PM »
I've been following along and I wasn't sure how it was going to fit together. Now that it's running, I can see that there was a lot of real engineering involved in figuring out all the events involved in making it run.

Congratulations on making something that is a departure from what most have done. I really like the way it looks running.

Thank You for posting,

ShopShoe

Offline Admiral_dk

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #38 on: November 02, 2021, 12:34:56 PM »
Another easy starter and fine runner from you  :ThumbsUp:

Offline RReid

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #39 on: November 02, 2021, 02:12:32 PM »
That's a very neat engine, it's great to see how well it runs! Very nicely designed and built. Congratulations! :ThumbsUp: :cheers:
Regards,
Ron

Offline Kim

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #40 on: November 02, 2021, 05:35:40 PM »
That's a really interesting engine!  It has a lot of fascinating motion to watch - way more than most IC engines. And it runs great!

Kim

Offline Longboy

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #41 on: November 02, 2021, 05:59:44 PM »
I've been following along and I wasn't sure how it was going to fit together. Now that it's running, I can see that there was a lot of real engineering involved in figuring out all the events involved in making it run....................Thanks for posting,
ShopShoe

An unusual engine created in an uncanny way. In my early days building Stirlings, with their many configurations possible in joining their two cylinders, has helped me with a few of my gas engine designs coming together. The S/F engine is my free standing, open crank design of a rare configuration. Not a career machinist who works from plans and print and no CAD but have an idea of "what goes where" as the build progresses.  Along with the pleasure of bringing some eye catching design, technique and creativity to the forum, :thinking: maybe the definition of "scratch build', means others looking at the work take their caps off saying, "what/how"?   :headscratch:   
   Dave.
Wadda you mean, "It don't run"???

Offline Roger B

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Re: LONGBOY'S "SQUARE FOUR" MODEL GAS ENGINE.
« Reply #42 on: November 02, 2021, 08:13:36 PM »
Excellent  :praise2:  :praise2: My brother in law has an Ariel square four as well as a CBX and a couple of 1950s Ariel singles.
Best regards

Roger