Build of Cirrus V8 (C Fellows design)

[cfellows]

Simon, that's pretty thick, over .015".  I'm thinking you'd do better with a lighter spring.  Check your PM...

Chuck

[sco]

I've re-made the camshaft a much closer fit in the central tube to minimise any air leakage between cylinders and I've also started on the flywheel.  After roughing it out I ran the lathe in reverse and used a boring tool to clean up the central boss - not sure if it's technically correct but it worked!  Planning to use Marv's flywheel program to mill out the spoke pattern.

Simon.

[Jo]

  Is that Aluminium, is it going to add much in the way of momentum. Now a nice bit of steel 

Have you thought of trying some thick sticky grease or O rings to discourage air leaks 

Jo

[sco]

You are right it is Aluminium and hence won't have a high moment of inertia - what I want to do but haven't worked out how to do it yet is give it a brass rim.  Need either a scrap of brass tube or some helpful bod to roll up some sheet and solder the seam.

Simon.

[cfellows]

With the number of power strokes per revolution in this engine, you don't really need much of a flywheel.  Depending on diameter, aluminum by itself will do just fine.

Chuck

[sco]

Chuck,

Seeing yours run without a flywheel I guessed that might be the case - the brass rim idea was for added visual interest / gratuitous bling 

Simon.

[sco]

Couldn't scrounge any brass but did score a piece of bronze - couldn't bare to turn 90% of it into swarf so trepanned the end face to leave the centre for another project.

Plan is to make a thin rim with the bronze, bond it to the ally hub and then skim it up to final dimensions.

Simon.

[sco]

Rim bonded to the hub and skimmed close to final dimension.  Need the output from Marv's flywheel program to cut the spoke detail but I'm going to do a dry run on a scrap bit first.

Simon.

[cfellows]

Flywheel looks nice.  Now all you need is a clutch disk, pressure plate, throw-out bearing and clutch release lever... 

Chuck

[sco]

Finally after much prevarication we have spokes!

[smfr]

Very nice, Simon! 

Simon

[vcutajar]

Yes, a fine looking flywheel Simon.  Was the tapped hole in the hub done at an angle?

Vince

[Jo]

 

Interesting I have the opportunity of doing something similar in my future: but the spokes will need to be cruciform 

Jo

[sco]

Yes, a fine looking flywheel Simon.  Was the tapped hole in the hub done at an angle?

Vince

The tapped hole - thanks for reminding me was a near lulu.  Drilled slightly at an angle with the tapping drill just missing the rim of the flywheel - forgetting that the tap has a much bigger shank doh!  So took an old M3 tap and cut it down so it would fit inside the rim, using a dremel grind some flats on the end and carefully cut the thread using a spanner to turn it.  Narrow escape!

Simon.

[vcutajar]

I still have to do mine (tapped hole) and I am not looking forward to do it!

Vince