Smoking engine

[Adrian Payne]

Many thanks for all the suggestions so far.
For the avoidance of doubt the compression test was conducted with a stone cold engine, cranking on the starter with all other plugs in place and the throttle open.
All cylinders recorded a pressure of about 110 PSI and adding a squirt of oil made very little difference (less than 5PSI)
This is a low compression mag engine and as I said before has better compression than our other non smoking engine.
In fact, with 2 up, it goes faster up hill than our other car with 1 up.
Does this seem to indicate that it could be the guides, unless oil can come past the rings but not compression??
Any other route for oil into the bore??
Many thanks.
Adrian.

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The engine was run in with Morris straight 30 and was driven straight away with no idling. If the rings were not bedded in properly would the oil test show a greater difference.
With regard to crankcase pressure, the valve chest cover is of the open type with the correct holes in the gasket. There is no sign of oil being blown out so I doubt much pressure.
Many thanks.
Adrian.