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Yesterday I managed to make the tappets for one engine (8 in all) and they are now awaiting my first attempt at case hardening. To speed up their production I made a tube out of stainless steel to fit over the slot drill I was using. The method worked fine and it didn’t take too [...]

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 [...]

Today’s session – the end of the beginning but not the beginning of the end! The 3rd and last camshaft has been made for the two Seal engines I am building at present

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.