Author Topic: Hoglet, an European Version  (Read 15864 times)

Offline petertha

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Re: Hoglet, an European Version
« Reply #60 on: December 17, 2017, 04:56:54 AM »
Valves are made and also the valve seat machining in the heads is finished.
Valve seats are also made now and the usual valve grinding operation with final vacuum test.

Nice work!
I'm always interested to see how others do their valve assemblies.
- what material are the valve seats made from?
- did you lap the valves in a dedicated seating pot or the valves within their respective seats
- how about your vacuum test, do you look for a long term hold or if it decays to ambient after X amount of time?
- what kind of lapping compound?

Offline fumopuc

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Re: Hoglet, an European Version
« Reply #61 on: December 17, 2017, 06:18:11 AM »
Valves are made and also the valve seat machining in the heads is finished.
Valve seats are also made now and the usual valve grinding operation with final vacuum test.

Nice work!
I'm always interested to see how others do their valve assemblies.
- what material are the valve seats made from?
- did you lap the valves in a dedicated seating pot or the valves within their respective seats
- how about your vacuum test, do you look for a long term hold or if it decays to ambient after X amount of time?
- what kind of lapping compound?


Hi Peter,
the valve seats are part of the cylinder head which is made from cast iron, German GG25 (EN-GJL-250)
The valve guides are made from brass, German MS58 (CuZn39Pb3/CW614N (2.0401)/EN 12164) you can get it anywhere here.
The valves are made from stainless steel, German 1.4305 (X8CrNiS18-9 (DIN EN 10088-1))
At Reply #37 is a picture of the just machined seats in one head, below some additional pictures of the lapping process.
The used compound is #3 of this chart.
http://www.gloeckler.com/Products/Lapping-Pastes/Lapping-Pastes-oilsoluble/EN_index_1316.html
Anywhere here in the forum or at the Model Engine Builder magazine, I have learned that the vacuum should be kept for minimum 10 seconds until it is complete gone again. Thatīs my easy way to do it.
At the picture of the head and the valve, always right side is already lapped. There is a slight grey colour visible at the respective area.
Kind Regards
Achim

Offline fumopuc

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Re: Hoglet, an European Version
« Reply #62 on: December 17, 2017, 06:38:20 AM »
Hi Chris, I could imagine that it will never see a head gasket again, thanks for watching. No bike scheduled yet.


Hi Peer, thanks. You are right, Mr Cox has never used a gasket.


Hi Simon, thanks for watching.


Hi Vince, thanks. Good to know you are still following.


Hi Tjark, good to know that you enjoyed the thread. The Snow will be attacked soon again, may be the shop gnomes have lost their interests in the sabotage in the meantime.


Kim, Bill, Yogi, thank you very much for watching and given friendly comments.


Itīs at great and very friendly community here and it is a real pleasure to be part of it.[size=78%] [/size]
Kind Regards
Achim

Offline Roger B

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Re: Hoglet, an European Version
« Reply #63 on: December 17, 2017, 07:13:49 AM »
Splendid  :praise2:  :praise2:  :wine1: We had 20cm of snow yesterday so R&D is remaining closed  ::)
Best regards

Roger

Offline fumopuc

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Re: Hoglet, an European Version
« Reply #64 on: December 17, 2017, 07:57:40 AM »
Thanks Roger.
Here are only 5 mm of snow from last night and it is slowly disappearing already.
I am very happy with my test bench on the working table, directly under the window in the roof, so I am very close to any German rules of "Arbeitssicherheit", in any case in my understanding.  :LittleDevil: :lolb:
Kind Regards
Achim

Offline fumopuc

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Re: Hoglet, an European Version
« Reply #65 on: December 25, 2017, 08:00:55 AM »
Merry Xmas  for everybody. Enjoy your time with the family and all the goodies from Santa.


The Hoglet has got a small Xmas update. 
It is supposed to run with its own fuel tank next time.


Also an exhaust was made in accordance with the drawings of Mr Cox.
Bending was done with a sand filling in the annealed 10x0,5 mm brass tubes.
Kind Regards
Achim

Offline fumopuc

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Re: Hoglet, an European Version
« Reply #66 on: December 28, 2017, 03:48:07 PM »
Hi everybody,
here a final Video and some pictures of the engine, ready to be stored.
<a href="https://www.youtube.com/watch?v=h6HH5gfJLE4" target="_blank">http://www.youtube.com/watch?v=h6HH5gfJLE4</a>
It was a real pleasure  to build this engine.
Thank you Mr Cox for sharing your drawings.
Hopefully he has a nice place up there in the sky where he can watch all the copies of his engines around the world. 
Kind Regards
Achim

Online Kim

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Re: Hoglet, an European Version
« Reply #67 on: December 28, 2017, 05:36:30 PM »
That is great, Achim! It purrs like a kitten!
Kim

Offline Jo

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Re: Hoglet, an European Version
« Reply #68 on: December 28, 2017, 05:56:21 PM »
I do like that Achim  :embarassed:

I had tried to take the Hoglet off my build list as its made of bar stock  :Doh: but it might have to go back on it again.

Jo
Enjoyment is more important than achievement.

Offline crueby

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Re: Hoglet, an European Version
« Reply #69 on: December 28, 2017, 06:33:31 PM »
Very well done!

Offline Dave Otto

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Re: Hoglet, an European Version
« Reply #70 on: December 28, 2017, 06:48:55 PM »
She looks, runs, and sounds great!
Very nice work Achim.



Dave

Offline vcutajar

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Re: Hoglet, an European Version
« Reply #71 on: December 28, 2017, 08:03:56 PM »
Great runner Achim.

Vince

Offline ShopShoe

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Re: Hoglet, an European Version
« Reply #72 on: December 29, 2017, 01:34:45 PM »
Sweet Success.

I have enjoyed every finished version of this engine through the years. I enjoyed your build log and appreciate the things you did to bring the engine to this point.

Congratulations and Thank You for Posting,

ShopShoe

 

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