Author Topic: Bruce Macbeth Engine, European Version  (Read 76293 times)

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #450 on: April 02, 2021, 07:05:46 PM »

And I like your sterile tray that you keep your parts in. Looks like you're ready for the operating room!   :Lol:

Kim


Hi Kim,
that was a special offer at our local discounter.
Some kitchen stuff.
A set of 4 pieces, not proper deburred and sharp like a knife.
Nobody wanted to buy them, I have got the set for EUR 2,00.
10 Minutes deburring with a Dremel and there we are.

Kind Regards
Achim

Offline Tonyr

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Re: Bruce Macbeth Engine, European Version
« Reply #451 on: April 02, 2021, 08:10:55 PM »
Achim,

This is one of those builds that is so good, there is nothing really I can say that Would be enough.

Tony

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #452 on: April 04, 2021, 06:50:40 AM »
Achim,

This is one of those builds that is so good, there is nothing really I can say that Would be enough.

Tony


Hi Tony, thanks for the nice and friendly comment.
Good to know, that you are still following along.
May be not really, but perhaps a bit similar to the quality of an Austin seven model engine, build in Manchester during the last couple of month.

Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #453 on: April 04, 2021, 07:21:26 AM »
Hi everybody,
we have cylinder heads with valve guides and valve seats now, so valves are needed next.
The following pictures are showing my way to do it.
For me it is fine like this, knowing that there are also multiple ways used by different model engine makers.
Since I have made this Inverted Center, as shown with plans in MEB #37, I am very satisfied with this way to do it.
The required cutting tools are nearly the same as used for the valve seats/guides.
Last picture, the first sample parts to get again familiar with the process.
Kind Regards
Achim

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #454 on: April 04, 2021, 07:40:20 AM »
... checking the grinding in a sample valve seat. Seems to be fine.
And than the go to make them all.
This funny nut was the first thing at hand to check the spring position.
Kind Regards
Achim

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #455 on: April 04, 2021, 11:22:30 AM »
Lots more bits  :)  :)  :ThumbsUp:  :wine1:

Did you have any problems cutting the faces on the valves with the countersink?
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #456 on: April 04, 2021, 03:39:44 PM »
Lots more bits  :) :) :ThumbsUp: :wine1:

Did you have any problems cutting the faces on the valves with the countersink?


Hi Roger, if the countersink is sharp and a good quality, no problem.
It is easy to set up this tool proper.
Kind Regards
Achim

Offline 90LX_Notch

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Re: Bruce Macbeth Engine, European Version
« Reply #457 on: April 04, 2021, 06:01:45 PM »
I’ve been quietly following along.  Very nice work Achim and very nice methods.  Everything is coming along nicely.

-Bob
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #458 on: April 05, 2021, 08:10:06 AM »
Thanks Bob, good to know that you are also still following along.


Next job, to open the in and outlet port from the cylinder head into the valve seat.
Now all machining at the heads is done and the very important question, is the water jacket still sealed, had to be answered.
The water inlet from the cylinder to the head has to be closed first for the test.
And next the water outlet into the exhaust manifold.
The wire was used to find the right position for the adapter.
To get more familiar with the pressure drop tester I have check it both ways, with the tester and in the water bucket.
So far everything was fine, including my badly hard soldered set up  part.
Kind Regards
Achim

Offline Admiral_dk

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Re: Bruce Macbeth Engine, European Version
« Reply #459 on: April 05, 2021, 10:26:17 PM »
With all that effort to test for leaks, you should be rather sure that you do not get water into places where it will do damage  :ThumbsUp:

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #460 on: April 06, 2021, 09:06:06 AM »
Hi Per, hopefully.


There is a specific place in this design of the outlet port, where I was a bit worried about.
Marked in the  attached picture.
It looks safe, but the theoretical measurement is 0,77 mm.
And this after a light design change, before it was less than 0,5 mm.
If I take into account the complete tolerance chain, starting by the raw parts before hard soldering and followed by the assembly machining it could get critical, because you can´t see it.
« Last Edit: April 06, 2021, 09:12:22 AM by fumopuc »
Kind Regards
Achim

Offline Roger B

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Re: Bruce Macbeth Engine, European Version
« Reply #461 on: April 06, 2021, 05:10:34 PM »
You need to use good hard water. The amount of limescale (Kalk) in it will block any small leaks  :stir:  :wine1:
Best regards

Roger

Offline fumopuc

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Re: Bruce Macbeth Engine, European Version
« Reply #462 on: April 08, 2021, 08:20:24 AM »
Hi Roger, may be a solution, but without any leakage would be the best.


Valves and cylinder heads had to be paired now.
Grinding as usual.
Leakage test with the small vacuum pump, as usual also.
Most of them has kept the vacuum for minimum 15 sec, so that was fine for me.
Cleaning with the discounter ultrasonic device, followed by some oil for rust prevention.
Next to do, valve caps / spring retainers.



Kind Regards
Achim

Offline Vixen

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Re: Bruce Macbeth Engine, European Version
« Reply #463 on: April 08, 2021, 07:58:18 PM »
Hello Achim,

More good progress, you must very near to completion.  :ThumbsUp: :ThumbsUp:

Please can you remind me of the diameter of the valves and inlet/ outlet ports. They look to be quite small.

Do you do the vacuum test dry or with a the oil?

Mike
It is the journey that matters, not the destination

Sometimes, it can be a long and winding road

Offline Craig DeShong

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Re: Bruce Macbeth Engine, European Version
« Reply #464 on: April 09, 2021, 01:31:19 AM »
I would think a valve leak test that exceeds 15 seconds would be more than adequate.  Still following along Achim.
Craig
The destination motivates us toward excellence, the journey entertains us, and along the way we meet so many interesting people.

 

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