V Twin 90 Deg. George Britnell

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Joined
Jan 3, 2012
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Location
Curitiba - Paraná - Brazil
Hi to everybody!
It's been a long time I do not post anything here.
My last project was the Bob Shore V4.
I'm currently building the V Twin from George Britnell. This project has been a very challenging one for me because it is a very detailed design. Very nice project.
I have almost 85% of the parts finished. I will try to post them in the sequence I machined them.
I would like to thank George for the hints and information he gave me. He was very kind and patiently with me.
Here is the engine.
20210511_150133.jpg


Tks,
Edi
 
Hello!
I started with the block/Crankcase. Front or Gear side. It is composed of two parts.
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This is the front side.
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In order to reduce the amount of machining on the backside of the gear side block, I drilled some holes on the block as shown on the photo bellow
20200420_191349.jpg


Lots of material to be removed.
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I had to make three pieces because of the error on the G Code.

Next will be the Flywheel Block Side.

Thanks,
Edi
 
Hi Edi,
I'm glad to see you are presenting your work on the forum. Looks great!
 
Hello!
Some more details about the V Twin construction.
Next, I machined the Ignition/Timing Cover and the Front Crankcase Cover.
For both parts, I machined the stock to the final Thickness and glued it to a base for the vise holding. It works very well for some thin and complex parts that you can not fix it directly on the vise.
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The same process for the Front Crankcase Cover.
I first machined the flat side then glued it for machining the upside. For this operation, the stock was held directly on the vise because I had enough height for fixing.
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To be continued.
Edi
 

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Continuing with the Crankcase.
A lot of material to remove for the crankshaft space.
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To avoid deforming the machined side, I supported the inside as shown on the photo bellow
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In order to get the center of the first machined side, I indicated the crankshaft hole.
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To be continued.
Edi
 
Really outstanding work Edi! I have never used super glue as a fixturing tool. I guess mainly because I've never had too much luck with bonding smooth metal surfaces together.
 
Beautiful work Edi. Truly showcases the mental processes required to find those parts in the raw material.

George - some of the challenges with bonding smooth surfaces using CA might be resolved with an intermediate medium ... e.g.,

Charlie
 
Thank you, Chalie!
Geoge,
In order to ensure good anchoring of the part, I provide the surface with rough finishing facing it with a high feeding rate so it produces small grooves where the glue bonds the part.
I do not use the taper, I bond the part directly and use heat to release the finished part (around 200 Celcius degrees).

Edi
 
Outstanding work Edi!
 
Hi to all!
Thanks, George.
Next was the turn of the Connecting Rods.
20201108_110715.jpg

I also used the bonding process. Again, it worked fine.

The inner rod
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The bigger rod
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First side finished for both connecting rods
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Second side machining
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Machining the slot for the Inner rod
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To be continued.
TKS,
Edi
 
Last edited:
The crankshaft assembly and finishing.
Machining the counterweights
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For this operation, I shimmed the two halves in order to clamp the assembly to the vise
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Shaping the 20 degrees angle and the radius on the corner of the throw
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After truing the two halves on the lathe, the throw pin was positioned with #4/0 taper pin on the flywheel side
20201110_182711.jpg




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Thanks,
Edi
 
The rocker arms were also machined using the bonding approach
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After machining the profile, I flipped it 90 degrees for the pushrod pocket and the adjusting screw thread.
I found the center of the hole and the center of the width of the first part and knowing the pitch between the two parts was easy to drill the second one
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The second side was machined on the lathe
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At this point, I decided to make the Flywheel
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Back to the mill, I started on the Cylinder Heads.
Setting the 9° for the Spark Plug
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First I machined the pocket
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Then I made a program to machine the angled surface of the Spark Plug boss
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Getting the center of the Spark Plug hole
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With the Valves seats in place. Made out of cast iron
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More on the heads to come
TKS,
Edi
 
In order to ensure the perfect alignment/seat of the valve, I made a tool to touch the Valve seats
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Grinding the relief angle
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For the following operations, I hold/bolted the head on a square block.
Here it set to 8.34° for both sides of the top
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Now machining the fins
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Turning the Valves. Stailess Steel
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The groove for the Keeper Clip
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Thanks
Edi
 
Continuing with the V Twin building.
Thanks Chuck. It really worked very nice.

More on the valves.
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The valve keeper. 1mm end mill
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Rocker Post
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The Rocker Pivot Bolt
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Cylinder Heads completed
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Cutting the lobes on the camshaft
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Cutting the gears. In this picture the Cams Gears. The other gears were also a basic process.
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Edi
 
Hello to all!
More with the Camshafts.
Locating the position of the Dowelfor the key
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Dowel in place. 1.5mm diameter
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The keyway on the gears, I did use a Broach
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To hold the Cam Gear on the Camshaft was used a flat head 2mm screw
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The gears assembly on the block. There is two keyway cut on the crankshaft because I had not paid attention to the position in relation to the teeth
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The lifters 6.5mm diameter
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Finishing the Flywheel. This is the Starter Disc
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Thanks,
Edi
 

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