Dogshome I agree the oiling of the bearibngs and valve train would be no better/worse than the oiling by the blowby oil in the standard system. The purpose of this excesizi is not to improve the lubrication but to run the engine without the oily ehhaust mess.

Patxipt Good thought on the spring tension for pressure control. This is my first pass at this and possibly to reduce the pressure a different check valve i.e walbro carb may be a better solution. However the amount of oil bein passed to the combustion chamber even with this tired old engine seems to be small enough that it is being completely burned so that NO oil is present in the exhaust pipe after 45 minutes of running. I suppose the oil being burned in the combustion chamber could lead to carbon deposits and ring sticking but isn't a good 2s oil formulated to minimize carbon buildup? Certaily there is less oil now than with 20% oil in the fuel.

The only concern now is the reduction in cooling by the oil carrying off some of the heat. That is not a problem at the present as the ambient temp is around 0C (32F) at present but further testing and measurement will be done come warmer weather. The current engine temperature (measured with an infrared thermometer) is around 120deg C near the glow plug, 90 deg C on the head and 200deg C on the exhaust pipe.