www.mikes-models.com blog

Today I managed a session in the workshop and completed (other than cutting a screwdriver slot in the valve faces) the first set of 8 valves. Last night I thought I would change my plan and get something to revolve to spur me on! To that end I ma going to get the valve side [...]

Last camshaft underway today for the Seal 15cc engine

The second camshaft for a pair of Seal 15cc petrol engines to a design by Edgar T Westbury. The two camshafts that have been made are turned differently to allow (hopefully) the engines to turn contra rotating propellers.

The answer to a problem of the wrong cam profile fora Seal engine turn out in fact to be a bonus! Since it is the pattern required to run the engine in reverse as it were for powering a contra running engine in a twin engine power boat.

A question is asked to clear up some confusion over Cam profiles and firing order. Also how best to build a pair to power contra rotating propellers.

Three camshaft blanks are being made before profiling the cams takes place. One is being made from steel that will then be hardened as an experiement. They are destined to be used in two Seal engines being built as a twin petrol instalation in a model calssic boat. Follow the build here.

The first proper camshaft blank has been made, only another 2 to go. This is for a pair of Seal 15 cc engines being built to power a classic model power boat.

Work starts on the Seal camshaft at last. Even though this one is a practice to pove the system of turning. Another two will have to be made for the two engines proper.

  Today’s session started later than usual and was more of a potter around cleaning up after the last few days work. I then spent time sorting out the filing cabinet fitted in the new frame between the Myford Lathe and the Milling machine. Quite a relaxing session really and perhaps that’s why about 1200 [...]