Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Oil level,

There are only three routes (the hoses) for oil to drain back into the engine after shut down, plus whatever oil drains back from various places in the engine such as the rocker boxes and cam chest.

Looking at the hoses first:

Because the return line terminates above the tank oil level, drain back from that line is limited to the < 1/10 liter capacity of that hose. (I'm using 30" hose lengths here to estimate. I believe the actual length is shorter)

The maximum amount of oil that could return via the smaller vent hose would be something like .05 liter, and that hose terminates above the oil level in the tank also.

So that leaves the primary culprits as the oil feed line (routing through the oil pump) and the drain back from other parts of the engine. Without knowing how much oil is present in the non sump parts of the engine during normal running, it's anyones' guess as to how to apportion their respective contributions.

Obviously the combined amount is substantial, based on forum posts. And I agree with Callums conjecture on wet sumping making for harder cranking.

BTW-I cycle the key 2-3 times with 2-3 second pauses between cycles before cranking if the car has been standing for some days, and that really seems to help starting. My conjecture, as yet unproven, is that the fuel system provides an extra amount of fuel on power up, and the multiple key cycles provide multiple enrichments.