Author Topic: 5 Cylinder radial somewhat based on the Morton but not much  (Read 1178 times)

Offline Admiral_dk

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #15 on: March 18, 2024, 06:32:53 AM »
Thank you George - that makes sense  :ThumbsUp:

Can kind of also see why there isn't enough space for a correct spacing with a higher (than 5) Cylinder number  :thinking:

Per            :cheers:

Offline gbritnell

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #16 on: March 18, 2024, 11:05:08 AM »
From my readings the crank pins on some of the full-size engines were evenly spaced due to space restrictions on the master rod so to compensate for correct valve timing the lifters/cam followers were operated by offset levers. Being as the cam lobes operated all the cylinders they had to be located in the true timing position.
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Offline gbritnell

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #17 on: March 19, 2024, 11:51:14 PM »
Steady progress on the radial. While I had the rotary table set up I finished the crankshaft main bearing support disc. I then made up the cam ring. I purchased the 48 D.P. internal gear from Stock Drive Products. It was pricey for what it is but making the tooling to broach it in my big lathe couldn't compare with the cost in time. The gear is 303 stainless steel. It needed to be mounted to a disc that would rotate on a plain bearing. The disc was turned from W-1 drill rod. I didn't have any 1.00 (25.4mm) stainless steel. The gear and the disc are screwed together with 3- 0-80 flat head phillips screws. I also cut 3 small grooves in the periphery that was filled with silver solder. That way I didn't have to rely on the screws for all the holding. In CAD I created a step-off chart to machine the 3 lobes on the cam ring. After machining and silver soldering the small steps were filed smooth and polished.
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Offline gbritnell

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #18 on: March 19, 2024, 11:58:01 PM »
This last set of pictures show the parts assembled for fit. The small gear mounted on the crank needed to be pulled off so I could get the front bearing plate in place. Nest came the cam ring then finally the gear was put back on. The 4th picture shows the main crankshaft lined up with the slave crank. The master rod will locate over both of them. The last picture is the slave crank sticking out of the rear housing.
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Offline Kim

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #19 on: March 20, 2024, 04:36:59 AM »
You do amazing work, George!  Thanks for sharing pictures of your progress with us.   :popcorn: :popcorn:

Kim

Offline ddmckee54

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #20 on: March 20, 2024, 03:55:29 PM »
I knew radials were complex and confusing, but 3 lobes on the cam?  How's that work?

Offline gbritnell

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #21 on: March 20, 2024, 08:31:13 PM »
The engine has 5 cylinders. The firing order is every other cylinder, 1-3-5-2-4. The gear reduction of the cam ring with 3 lobes allows cyl. #1 to operate, then the next lobe CCW operates cyl. #3 and the remaining lobe CCW operates cyl. #5 and so on and so forth. Just a matter of math. The hard part was finding an available internal gear that would fit the base dimensions of the Morton M-5 and redesigning my engine to accommodate the proper gear train. The cam ring has to turn in the same direction as the crankshaft so the gear train required an idler gear to do so.
I could give you the exact numbers if you want.
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Offline ddmckee54

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #22 on: March 21, 2024, 08:52:23 PM »
I thought I had it figured out yesterday afternoon.  But when I started with cam lobe under the #1 cylinder, after the right number of intake cycles my solution had the cam lobe under the the #2 cylinder.  I couldn't figure out what I was missing.  I completely forgot about firing order, because that's exactly where it should have been.

Offline AlexS

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #23 on: March 22, 2024, 10:53:58 PM »
ddmckee54 If i am right 1:2 ratio between 3 lobe camshaft and crank 1-3-5-2-4. lobes 120 degree equal spaced out between each other. degree between cylinder is 72 degree. 1-3 ignition is 2x72 degree = 144 degree. cam is 120 degree so 144-120= full opend cam cylinder 3 after 1 is 24 degrees.
« Last Edit: March 22, 2024, 10:57:19 PM by AlexS »

Online Roger B

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #24 on: March 24, 2024, 07:55:26 AM »
Just catching up on this. Excellent work as ever  :praise2:  :praise2:  :wine1:

Is the 62 thou/1.59mm key a standard size? I have only seen sizes down to 2mm.
Best regards

Roger

Offline Bluechip

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #25 on: March 24, 2024, 08:00:42 AM »
Just catching up on this. Excellent work as ever  :praise2:  :praise2:  :wine1:

Is the 62 thou/1.59mm key a standard size? I have only seen sizes down to 2mm.

For some reason 16 SWG, 1/16" and 1.6 mm  are pretty much the same.  No idea why that's stuck with me ..  :headscratch:

So ... 1/16 inch ??????  Imp. key

D.

Edit  If you look here:

https://cpc.farnell.com/w/c/tools-maintenance/hand-tools/prl/results?packaging=each&st=hex%20keys

Quite a number of keys < 2mm hex.    :ThumbsUp:
« Last Edit: March 24, 2024, 08:09:02 AM by Bluechip »

Online Roger B

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #26 on: March 24, 2024, 09:39:18 AM »
Sorry, I was talking about the square key George is using to drive the fan.
Best regards

Roger

Offline Bluechip

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #27 on: March 24, 2024, 10:34:27 AM »
My fault ....  :old:  should not assume.

Back to wood-butchering.

D.

Offline Art K

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Re: 5 Cylinder radial somewhat based on the Morton but not much
« Reply #28 on: March 25, 2024, 01:47:42 AM »
George,
Great work on the radial! I guess I've been out of the loop and missed the start of this one.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

 

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