Triumph 650 Twin Engine

[mikemill]

Thanks for all the tech info and advice, plan B remake flywheel with more meat on counter weight, make weights to represent big end of rods, then balance.

Mike

[Roger B]

Only just seen this thread, looks a fun project, I will be following along     

[mikemill]

The cylinder block on the full size Triumph engine is an iron casting, but as I am cutting from solid I decided to make the block in two halves to make machining easier, Holding the 4in dia ali bar in the four jaw enables machining on the mill then transfer to the lathe thus maintaining the centre   Here are the several stages in producing the block.
1)   Cutting the base and mounting holes
2)   Parting off waste material
3)   Drilling the cylinder
4)   Boreing out the cylinder
5)   Forming the recesses for the push rod tube
6)   Cutting the tapper
7)   Machining the cooling fins
   The finished block.

Mike

[90LX_Notch]

Nicely done Mike.  Great setups.

-Bob

[b.lindsey]

Love it so far. Nice work and setups as Bob said!!

Bill

[Vixen]

Mike,

How ever did you cut those fins. Was it an interrupted parting tool cut or did you use a slitting saw?
Open mouthed in amazement

Mike

[gbritnell]

Looks like it's going to be a fantastic build. I like your documentation.
gbritnell

[Tennessee Whiskey]

Beautiful. I'm really liking this one 

Eric

[Flyboy Jim]

Once again.............well done and documented.

Jim

[mikemill]

Thanks for the encouraging comments

The finns where cut with a parting off tool ground with a radius end, lathe in back gear low revs, ali cuts well with a sharp tool no binding.

Mike

[Mike Bondarczuk]

Mike,

Really excellent work and details and I am looking at my full size 1959 T120 engine and comparing it to your work.

Mike

[zeeprogrammer]

Open mouthed in amazement

My thought exactly. Nice!

[mikemill]

Progress on the Triumph twin, making the pistons and associated components.

1)   Reaming the wrist pin holes
2)   Cutting little end slot
3)   Parting off oil rings
4)   Turning the pistons and ring groves
5)   Jig to hold rings for lapping
6)   Finished piston group

Mike

[Chipswitheverything]

Enjoying your photos and procedures, Mike, this is a highly impressive project.   Dave

[mikemill]

The crank case was a formidable task as a lot of metal needed to be removed, I considered getting castings done but as making the patterns is as much work as machining from solid a plumed for the latter. The cases are machined from two 300mm x150mm x 50mm billets, using the center of the crank and the gearbox main shaft as datum’s when turning over the cases.
1)   Cutting to a depth of 0.1 per pass down to 1.5in
2)   Same case tuned over.
3)   Cylinder platform with locating and stud holes
4)   Completed case


Mike