Author Topic: Freelance Inline Twin  (Read 7303 times)

Offline gbritnell

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Re: Freelance Inline Twin
« Reply #90 on: April 29, 2017, 07:50:21 PM »
Exceptional work! I'm following this build and getting some new ideas.
gbritnell
Talent unshared is talent wasted.

Offline yogi

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Re: Freelance Inline Twin
« Reply #91 on: May 12, 2017, 11:07:00 PM »
Thank you gentlemen for the kind comments.  :cheers:

The next part for the engine I'll be making is the cylinder head.
I'll let the pictures do most of the talking but feel free to ask any questions.

Started with a facing cut:



The outside contour is milled to full depth:



Spotting and drilling:





Milling the combustion chamber:



Milling the recess for the O-ring sealing the coolant passage from the block to the head:



Drilling and reaming for the valve guides:





I'll be using Rimfire spark plugs. Since the reach is not long enough, the combustion chamber is getting an extension with a ball end mill:



First side of the cylinder head complete:



The cylinder head is turned over and faced to final thickness:





The coolant passage is milled:



The second side complete:



The head is then set up on its side to drill the holes for mounting the exhaust manifold and carburetor mounting. The location for the inlet and exhaust ports are only spot drilled. They are angled and will be drilled later.






To be continued...


Offline 90LX_Notch

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Re: Freelance Inline Twin
« Reply #92 on: May 13, 2017, 02:27:58 AM »
Nice.  Waiting for the continuation.


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

Offline yogi

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Re: Freelance Inline Twin
« Reply #93 on: May 13, 2017, 03:58:57 AM »
Thank you Bob!

To finish up the cylinder head, I needed the valve guides as the inlet and exhaust passages are drilled trough the guides.



Valve guides installed in the cylinder head (press fit):





The cylinder head is clamped in the vise at the correct angel using a bevel protractor.



The location of the hole is picked up with a center in the spot drilled location marked earlier.



Using an end mill, a flat is milled to be able to center drill and drill the hole on the angled surface.









The same process was then repeated three more times:







To finish off the cylinder head, it needed a cover do seal the coolant passage.



The finished head assembly:




Thank you all for following along and stay tuned for more...
Yogi




Offline Brendon M

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Re: Freelance Inline Twin
« Reply #94 on: May 15, 2017, 07:41:20 AM »
Hello Yogi, it is looking great!
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Offline fumopuc

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Re: Freelance Inline Twin
« Reply #95 on: May 15, 2017, 07:25:46 PM »
Hi Yogi, I am still following quietly.
Kind Regards
Achim

Offline toolznthings

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Re: Freelance Inline Twin
« Reply #96 on: May 16, 2017, 01:15:41 AM »
Beautiful workmanship ! Great progress, too.  :cartwheel:

Brian

Offline Dave Otto

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Re: Freelance Inline Twin
« Reply #97 on: May 16, 2017, 01:27:37 AM »
Hi Yogi
The cylinder head looks great!


Dave

Offline Art K

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Re: Freelance Inline Twin
« Reply #98 on: May 16, 2017, 03:38:20 AM »
Yogi,
In just got caught cup on your most recent posts. All I can say is that it looks great. Still following along.
Art

Offline yogi

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Re: Freelance Inline Twin
« Reply #99 on: May 18, 2017, 05:34:54 AM »
Thank you guys for the kind comments and following along. It's very much appreciated!  :cheers:

For the valves, I'm trying something new. Well, new to me, as it has been successfully done by other people before.

The valves are made up of two pieces and silver soldered together. With this method, the long, slender valve stem is already precision ground and doesn't need to be machined.

Before and after silver soldering:





The valve head is finished:





Last, the valve stem is turned to length and a groove for the spring retainer is cut:



The finished valves:




This method worked very well, and I can see me making valves this way in the future again.

Thank you for stopping by, and stay tuned for more...
Yogi





Online Roger B

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Re: Freelance Inline Twin
« Reply #100 on: May 18, 2017, 07:36:42 AM »
Still following along  :wine1: looking good  :praise2:  :praise2:
Best regards

Roger

Offline Kim

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Re: Freelance Inline Twin
« Reply #101 on: May 19, 2017, 07:14:06 PM »
Yogi, the valves look great!  And I like your method of fabricating vs just turning them down.
However, don't you have any problem with the rods going banana shaped during the soldering process?  How do you prevent that?
Kim

Offline yogi

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Re: Freelance Inline Twin
« Reply #102 on: May 20, 2017, 09:24:57 AM »
Thank you for the kind comments Rodger and Kim.  :cheers:

Kim, to tell you the truth, I didn't really think about it. It's a good point though.

The valves are made out of O-1 drill rod. The reason I chose drill rod was because that's what I had that was precision ground. The solder I used was Easy-flo 45. Concentrating the heat to the large head part, being careful not to overheat the parts. I tried to get as little heat into the stem as possible.

I really don't have a good answer. Maybe I just got lucky...  :thinking:

Yogi

Offline Ian S C

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Re: Freelance Inline Twin
« Reply #103 on: May 20, 2017, 10:55:21 AM »
The trick of keeping the valve stem cool while silver soldering is to stick it in a potato.
Ian S C

Offline steam guy willy

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Re: Freelance Inline Twin
« Reply #104 on: May 20, 2017, 12:30:18 PM »
The trick of keeping the valve stem cool while silver soldering is to stick it in a potato.

Pink fir apple, Aliaser Craig or Marfona ??!!!!  Or even a baking one ..killing two birds with one stone !!