Ford Prefect V8 Hot Rod - 23/06/2025
Still struggling to find any time for the car, house hunting, preparing ours for selling and doing stuff for my mate have all eaten in to my time and energy to the point where an hour on the rod is a major event. I did get to look at the oil consumption thing, it's taken a lot of working out to get to the issues but I think I am there now. Just as well as I had discussed selling it, I was at my wit's end with things. So now I have new heads with much better flow, thicker oil and a reduced oil pressure spring. I had been seeing 120PSI, which while impressive is not what you want on an old Rover V8. The book says 30-40 PSI at 2400 RPM, I am still a bit higher than that when hot but it's a hell of a lot closer than it was. Long term followers of my exploits may remember that the oil pump originally fitted to the Rover lump would not clear the steering rack so I swapped it for a pump from a 1970's Buick Grand National that uses the same engine block but gave me the clearance I needed. The Grand National clearly has much better engineering tolerances and runs much higher pressure. The smoke stopped immediately, I don't know where it was being forced through but there is no visible smoke at all now, although it does still smoke a bit when cold - no doubt a result of no valve stem seals, they didn't worry so much about hydrocarbon emissions back in 1973. I could sort it but it will be ok for the IVA test which specifies only that there should be no visible smoke, I will warm it up before I get there.