The engine has an r/c throttle and may have been intended for some form of r/c club Pylon Racing.

The G40 has been around for decades in c/l form but is hardly cutting edge technology in PR.

The conversion could date from the early 1990's.



The two piece head has been created from the original glow head. The comp screw is a spare Taipan series 13 1/4" x 32 tpi.



Right now the contra piston sits against the top rim of the central hole. It's inserted from below.

I'd imagine that an important advantage of a two piece head is that it's easier to machine and perhaps lap the CP and the head.





The CP is machined from Aluminium alloy and is a very tight fot in the head. Perhaps it's shrunk in without an o-ring.



Regrettably there's no real practical use for a big diesel like this in c/l flying.

It's always going to be less powerful than when in glow configuration and the major advantage of more economy doesn't help.

Ray