Author Topic: Alyn Foundry CHUK 2  (Read 2123 times)

Offline Admiral_dk

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Re: Alyn Foundry CHUK 2
« Reply #15 on: March 02, 2022, 04:14:52 PM »
Looks good and so close to first POP  :ThumbsUp:

 :popcorn:    :cheers:

Per

Offline Alyn Foundry

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Re: Alyn Foundry CHUK 2
« Reply #16 on: March 03, 2022, 11:48:00 AM »
Good morning Ray.
 
As Per wrote, you’re nearly there now.

I’m just wondering if you’re relying upon the weight in the cam follower to shut the port or do you have a spring hidden somewhere?  ;)

 :cheers:  Graham.

Offline RayW

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Re: Alyn Foundry CHUK 2
« Reply #17 on: March 03, 2022, 05:13:04 PM »
The brass bar that the cam follower is mounted on is heavy enough without spring assistance and closes the shutter well Graham.
Just received the small springs for the exhaust flap valve today, but, frustratingly, the little end bearing which was due to arrive Monday or Tuesday has still not arrived.
Ray

Offline Alyn Foundry

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Re: Alyn Foundry CHUK 2
« Reply #18 on: March 03, 2022, 07:00:46 PM »
I too am eagerly awaiting a very late 1st class package Ray.

Royal “ snail “ are definitely living up to their name these days….

Online Jasonb

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Re: Alyn Foundry CHUK 2
« Reply #19 on: March 03, 2022, 07:27:56 PM »
It's almost there Ray and looking good, the brass ring around the top of the cylinder will add a bit of colour.

Hope you both get your post soon.

Offline RayW

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Re: Alyn Foundry CHUK 2
« Reply #20 on: March 15, 2022, 05:41:53 PM »
Fitted the three springs that support the flap valve in the base today but not getting any compression or vacuum, so either the flap valve or the flame port shutter (or both) are not sealing. Despite this, it actually ran using the paint stripper nozzle on my gas torch.
Here is a short video of the first two runs.

It continued to start and run until it got too hot.
Sorry, didn't take any photos of the springs in the base. Will do so when I dismantle later on.
Ray

Offline Alyn Foundry

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Re: Alyn Foundry CHUK 2
« Reply #21 on: March 15, 2022, 05:56:55 PM »
It’s a runner, well done Ray.   :ThumbsUp:

You might find that having the base raised by some little feet will help the exhaust process and get the characteristic Raspberry.

 :cheers: Graham.
« Last Edit: March 15, 2022, 06:00:02 PM by Alyn Foundry »

Online Jo

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Re: Alyn Foundry CHUK 2
« Reply #22 on: March 15, 2022, 06:12:34 PM »
Nice, well done Ray.  8)

Jo
Enjoyment is more important than achievement.

Online Jasonb

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Re: Alyn Foundry CHUK 2
« Reply #23 on: March 15, 2022, 06:15:49 PM »
Good to see it running Ray

You tend to only feel compression when you turn them backwards, when going forwards there is just a little resistance as it quacks.

Online crueby

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Re: Alyn Foundry CHUK 2
« Reply #24 on: March 15, 2022, 06:41:19 PM »
Great!  :ThumbsUp: :ThumbsUp:

Online Roger B

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Re: Alyn Foundry CHUK 2
« Reply #25 on: March 15, 2022, 06:57:47 PM »
Excellent  :ThumbsUp:  :ThumbsUp:
Best regards

Roger

Offline RayW

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Re: Alyn Foundry CHUK 2
« Reply #26 on: March 15, 2022, 07:11:51 PM »
Thanks all for your comments.Yes Graham, I do still need to make some feet. I recycled a stainless steel rally plaque for the flap valve in the base, so perhaps that is why it's not 'quacking". As I said Jason, there is no resistance in either direction so I will re-lap the flap valve and the flame shutter to try and improve things.
I have also found that the shutter is sometimes catching on the bottom edge of the flame port as it closes, so I am wondering if it has bowed slightly. I may also add a small spring to ensure that the cam follower stays in close contact with the cam.
Ray

Offline Admiral_dk

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Re: Alyn Foundry CHUK 2
« Reply #27 on: March 15, 2022, 10:35:49 PM »
I bet that was a very satisfactory feeling when it came to life  :ThumbsUp:

Great first runs  :cheers:

Per

Offline RayW

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Re: Alyn Foundry CHUK 2
« Reply #28 on: March 17, 2022, 09:24:08 PM »
Made a couple of small tweaks and it is now running much better and quieter. I realised that the cam follower was bouncing slightly and making a knocking noise, so I have added a small tension spring to keep the follower in constant contact with the cam. The addition of a small screw in the rod guide to locate the bottom end of the spring has also enabled me to finely adjust tension on the rod, giving a better contact between the flame port and the shutter. This has resulted in the CHUK (duck) finding its characteristic quack.
I have found that an occasional squirt of WD40 into the cylinder ( with the flame extinguished), greatly assists the free running, if leading to a rather smoky workshop!
This is the video of the modified engine:
Ray

Online Jasonb

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Re: Alyn Foundry CHUK 2
« Reply #29 on: March 18, 2022, 07:21:16 AM »
That's running well now :)