V Twin 90 Deg. George Britnell

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e.picler

Edi from brazil
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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
 

e.picler

Edi from brazil
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Hello!
I started with the block/Crankcase. Front or Gear side. It is composed of two parts.
20200404_153414.jpg
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This is the front side.
20200420_111159.jpg


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
 

gbritnell

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Hi Edi,
I'm glad to see you are presenting your work on the forum. Looks great!
 

e.picler

Edi from brazil
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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.
20200519_153109.jpg
20200519_154650.jpg


To be continued.
Edi
 

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gbritnell

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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.
 

cwelkie

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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
 

e.picler

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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
 

gbritnell

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Outstanding work Edi!
 

e.picler

Edi from brazil
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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
20201108_124841 - Copiar.jpg


The bigger rod
20201108_164610.jpg


20201108_164741.jpg


First side finished for both connecting rods
20201108_165209.jpg


Second side machining
20201108_184800.jpg


Machining the slot for the Inner rod
20201108_194342.jpg

20201108_202415.jpg


20201108_205145.jpg


To be continued.
TKS,
Edi
 
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e.picler

Edi from brazil
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The crankshaft assembly and finishing.
Machining the counterweights
20201110_172624.jpg


For this operation, I shimmed the two halves in order to clamp the assembly to the vise
20201110_172652.jpg


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
 

e.picler

Edi from brazil
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The rocker arms were also machined using the bonding approach
20201119_095350.jpg


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
20201119_103637.jpg


The second side was machined on the lathe
20201119_201115.jpg


At this point, I decided to make the Flywheel
20201121_183828.jpg


Back to the mill, I started on the Cylinder Heads.
Setting the 9° for the Spark Plug
20201122_092444.jpg


First I machined the pocket
20201122_164013.jpg


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
20210123_170119.jpg


More on the heads to come
TKS,
Edi
 

e.picler

Edi from brazil
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In order to ensure the perfect alignment/seat of the valve, I made a tool to touch the Valve seats
20210123_185559.jpg

20210130_095807.jpg


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
20210213_173424.jpg


Now machining the fins
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Turning the Valves. Stailess Steel
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The groove for the Keeper Clip
20210303_200343.jpg


Thanks
Edi
 

kuhncw

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Very nice work Edi. Thanks for all the detail photos. I especially liked the way you held the small end of the connecting rod while machining the second side.

Chuck
 

e.picler

Edi from brazil
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Continuing with the V Twin building.
Thanks Chuck. It really worked very nice.

More on the valves.
20210303_202608.jpg


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
20210418_193352.jpg


Cutting the lobes on the camshaft
20210403_120728.jpg


Cutting the gears. In this picture the Cams Gears. The other gears were also a basic process.
20210417_134811.jpg



Edi
 

e.picler

Edi from brazil
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Hello to all!
More with the Camshafts.
Locating the position of the Dowelfor the key
20210417_175012.jpg


Dowel in place. 1.5mm diameter
20210405_202528.jpg


The keyway on the gears, I did use a Broach
20210405_204216.jpg


To hold the Cam Gear on the Camshaft was used a flat head 2mm screw
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20210418_193441.jpg


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
20210418_193246.jpg


Finishing the Flywheel. This is the Starter Disc
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Thanks,
Edi
 

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