Relief valve caps made and the one for the pump fitted. The oil pressure now stays within the Normale zone even at tickover and rises to about 2/3 across the zone to the "a" of Normale at about 1800rpm with the engine warmed up to 70C water temp. The pressure does not increase above 1800 rpm so I assume that is the point at which the regulating valve opens This is an improvement since cleaning the valve so the crud around the spring presumably was also between plunger and seat of the valve. I blew it through with the airline via the connection point for the oil pressure gauge.
I'm still struggling to get the Air/fuel ratio gauge to work properly as it frequently goes haywire, often after going down hill at which point the reading oscillates from one extreme to the other and then cuts out altogether. The sensor plugged into the exhaust just after the lower bend of the downpipe has a built in heater and at first I suspected a poor earth connection through the exhaust pipe and made a wired earth to the chassis. This seems to help but I now wonder if it needs the help of more heat from the exhaust - perhaps some lagging on the downpipe would help. When it is working the AFR fluctuates from 12.5 to 14 air to fuel on the level and on hills, dropping to 20 to 1 on the over-run downhill. I was interested to find out the effect of running with the mixture control pulled right out when driving with a wide throttle on a hill as recommended in the instructions for the Weber - it does make a slight difference to the pulling of the engine and the mixture strength increases from 12.5 to 11.5. The other option, running on a level road with the mixture control in the mid position where it acts as an extra air valve to weaken the mixture for economy also has the expected effect on the reading. All this was with the Winter/Summer setting on Winter. I did briefly try the Summer setting but the gauge playing up stopped me from seeing a sensible result.
Mike
