Bruce Macbeth Engine, European Version

[gbritnell]

Still watching and enjoying!
gbritnell

[vcutajar]

Watching, enjoying and learning in the background.

Vince

[Kim]

That looks amazing, Achim!   Excellent pictures, too!  I love the closeups - it really shows your fine detail work.  And I love the contrast of the white and black paint! Or is that gray and black? Whichever, it really looks nice!


Kim

[fumopuc]

George, Vince, Kim thank you very much for visiting and the friendly comments.


Kim, it is a light grey.
If the engine runs some day, hopefully, I hope to see than dirty oil running over this bright surfaces. May be it will look more realistic than.


Next to do for the final assembly are the more realistic hexagon bolts for the cylinder to crank case fixation.
It is a bit tricky to fasten them, because there is no chance to use a socket key. All bolts has be turned by a thin and tiny spanner.
I could not get any black M 3 bolts with small heads from stainless steel, only made be normal steel was available.
The German source to get them already black burnished is known in the meantime, but for this project too late.
A bigger purchase for a lot of special bolts was made 2 years ago already.
So the chemical assistance was necessary to get them black.
The temporarily used cross-head screws, which has been very comfortable during all the pre-assemblies, are swapped now.

[Dave Otto]

Hi Achim
You are continuing to make great progress!
Proper hardware is always a welcome addition to a scale model, looks very nice!

Dave

[fumopuc]

Hi Dave, thanks.
Good to know that you are still following along.
Retirement and the world wide pandemic are in this case an advantage for the progress made.


A further disassembly was necessary to start another reassembly again.
Pistons, con rods, gudgeons pins and piston rings are all joined now.
The piston assembly, supported by an earlier made tool for easier sliding in was very useful.

[fumopuc]

Hi Everybody,
last steps before some motion.
Con rod bolts tightening with a tightening torque of 1 Nm.
Than my set up of the engine at the test bench.
Over all it was something about 6 hours break in with different revs between 150 and 600 rpm.
<a href="https://www.youtube.com/watch?v=Bf6M5dIehsg" target="_blank">http://www.youtube.com/watch?v=Bf6M5dIehsg</a>

[Don1966]

 



 
Don

[Roger B]

Seems to turn nice and smoothly (I'm glad the video was not of the whole 6 hours)       That's a lot of small bolts to fix it all together 

I like your mini torque spanner 

[fumopuc]

Don, Roger thanks for visiting.


Hi everybody, next I tried to get more familiar with my Chinese pressure drop tester.
First of all, here I did not do the right calibration procedure adjustment, so the shown 30% loss is not realistic.
Zero % was at nearly 15 %.
I have check mainly the sound inside the crank case with my ear at the open door and this was in my understanding O.K.
A very smooth, very light blow by at each cylinder could be heard.
I have to do some more experiments with tester.

[fumopuc]

Hi everybody, next do, to continue with the cylinder heads.
First of all the hole in the heads has to be prepared by drilling and reaming to the required size for a light interference fit with the combined vale seat / vale guides.
These vale seats are the next parts to attack, followed by the valves it self.
I will try to show my way to do it here.
Until now I have never used a special made tool like George Britnell or Brian Rupnow recommend, so far, may be with luck, successfully.
Hopefully I will be able to repeat this.

[fumopuc]

... here the next pictures of valve seat / valve guide machining.
As I mentioned already, it is my way and sure not the only one.

[fumopuc]

... and how it looks like.
Generally the goal was to get it 0,02 mm thicker than the reamed 11 mm hole in the heads.
The set is complete and I am ready to fetch the arbor press and put it on my bench now.
And yes, no plan changes, it is still a 4 cylinder engine, the fifth is my set up part.

[fumopuc]

Hi everybody, I wish you all a Happy Easter.


It was time to get the valve seat into the heads now.
Managed by using my arbor press, some Loctite 603 mainly for sealing and some luck.
Everything was available and so the job was done without any issues.

[Kim]

Very tidy job on pressing your valve seats in!  I always have trouble with an interference fit.  I can never seem to get the correct amount of interference.  I'm usually on the 'way too much' side and the parts deform as they are forced together.

And I like your sterile tray that you keep your parts in. Looks like you're ready for the operating room!   

Kim