Progress on the miniature IC engines as of January 2014.

Machining the Cylinders – Part 2 – 05/01/14

Building the Prototype AMD Series Engines

Despite a slight slowing down of work over the Christmas period, I have still managed to do a bit more machining on the cylinders.  The main effort has been to cut the cooling fins which I did using a slitting saw rather than a parting tool as originally intended.  The singles were done on the rotary table.  The bores on the singles have now been finished ready to receive the liners.  These were done using a boring head on the mill.  The bolt holes for the cylinder head bolts were drilled using coordinates and the PCD facility on the DRO, then tapped.

The next jobs are to recess the bores for the cooling water where appropriate and to finish the detail milling an drilling work on the crankcases and cylinders.

As a reminder, I am building five prototype engines as follows, to test the design in its basic configurations:

  • Engine 1.  AMD5S,  air cooled SOHC, glow ignition, lubricated by oil mixed with fuel
  • Engine 2.  AMD5S, water cooled, DOHC, spark ignition, oil pump
  • Engine 3.  AMD10S,  air cooled SOHC, glow ignition, lubricated by oil mixed with fuel
  • Engine 4.  AMD10S, water cooled, DOHC, spark ignition, oil pump
  • Engine 5.  AMD20IL4, water cooled, DOHC, ignition method TBD.
Cutting the cooling fins on the water-cooled 20IL4 using a slitting saw.  Not strictly necessary on a water cooled engine, but looks better!

Cutting the cooling fins on the water-cooled 20IL4 using a slitting saw. Not strictly necessary on a water cooled engine, but looks better!

The two 5S engines, air cooled on the left, water cooled on the right.

The two 5S engines, air cooled on the left, water cooled on the right.

The two 10S engines, air cooled on left, water cooled on right.

The two 10S engines, air cooled on the left, water cooled on the right.