Bruce Macbeth Engine, European Version

[Vixen]

Hello Achim,

Looking good 

Keep a close eye on those roller pins when the engine is run. There is not much Loctite holding them in place and rockers always experience a lot of hammering.

Mike

[fumopuc]

Another batch of nice new shiny parts 

Great that you caught the missing clearance before commiting to making the rest of the camlobes

Hi Per, thanks.
To do fix it later would be possible, because the valve stem was untouched in this case.
But I thing it is useful to sort out as much as possible at an early stage.

[fumopuc]

Hello Achim,

Looking good 

Keep a close eye on those roller pins when the engine is run. There is not much Loctite holding them in place and rockers always experience a lot of hammering.

Mike

Hi Mike, thanks for your advise.
I have had already mixed feelings when I assembled it.
In Dougs drawing is no special advise for this fit.
His has designed the holes with 0.0938" and the pins also, that´s it.

[Vixen]

Hi Mike, thanks for your advise.
I have had already mixed feelings when I assembled it.
In Dougs drawing is no special advise for this fit.
His has designed the holes with 0.0938" and the pins also, that´s it.

Hello Achim

Could you make some different pins, with a small flange at one end and drill and tap the other end M 1.5 ?

Or drill and tap M 1.5 both ends?

Mike

[fumopuc]

Hi Mike, thanks for your advise.
I have had already mixed feelings when I assembled it.
In Dougs drawing is no special advise for this fit.
His has designed the holes with 0.0938" and the pins also, that´s it.

Hello Achim

Could you make some different pins, with a small flange at one end and drill and tap the other end M 1.5 ?

Or drill and tap M 1.5 both ends?

Mike

Hi Mike as a plan B it should be possible, only one pin close to the big bevel gear could cause a collision.

[MJM460]

Hi Achim, the detail in your model just keeps getting better and better.  Your skill and methodical approach shows in every post.

MJM460

[Rustkolector]

Achim,
I would upset the end of the cam roller pin just enough to create a little interference with the reamed pin hole in the rocker arm. Tap or squeeze the pin in place flush with both sides. Mark the end with interference should you need to drive the pin out in the future. If you decide to use a small dab of Loctite, put a small drop of it in one side of the rocker arm then insert the roller pin in the rocker arm from the opposite side of the rocker arm. Then oil the roller.
Jeff

[fumopuc]

Hi Achim, the detail in your model just keeps getting better and better.  Your skill and methodical approach shows in every post.

MJM460

Hi MJM460, thanks for watching and the friendly words.

[fumopuc]

If you decide to use a small dab of Loctite, put a small drop of it in one side of the rocker arm then insert the roller pin in the rocker arm from the opposite side of the rocker arm. Then oil the roller.
Jeff

Hi Jeff, thanks for your recommendation, it is always  appreciated very much.
With the Loctite I have done it like you mentioned it above.
Also with the very fine drop of oil to prevent any blocking of the roller and checking the roller movement after some hours  of curing.

[fumopuc]

Hi everybody, next challenge the cam lobes.
In my eyes tiny parts.
The available material in the base circle is a bit less than 2 mm.
So a 2 mm grub screw of the shelf is to long for the adjustment fixation.
To shorten 10 times a 2 mm grub screw is not my favorite job.
Some slots in shaft at the right place will necessary.
Anyway I do prefer a slot in places where grub screws meet a shaft to avoid any burr, which makes it difficult to pull the shaft out again through the bearings.
Milling by CNC an easy job.
The holes for the M2 grub screws, a job made the conventional way.

[fumopuc]

.... and a first sample assembly with my set up part cylinder head #0.
<a href="https://www.youtube.com/watch?v=eC4wZhVWKYE" target="_blank">http://www.youtube.com/watch?v=eC4wZhVWKYE</a>

[Admiral_dk]

That should work nicely Achim 

[RReid]

I truly admire the work you've done on that. And thanks for the video!

[Kim]

Very nice, Achim!  That video is great.  Watching it, it looks like the springs are fairly strong.  I assume that is intentional so the valves close quickly and follow the shape of the cams?

Kim

[fumopuc]

  I assume that is intentional so the valves close quickly and follow the shape of the cams?

Kim

Hi Kim, thanks.
Springs are always something with random here.
I have had a look  at the original design of Doug Kelley concerning dimensions and coils. 
Than I visit my favorite online shop her in Germany for this items.
https://www.federnshop.com/en/
At the end I do order something which is nearly in accordance with my metric dimensions and the original design.
The rest is hope, that it will work.