Having been involved in the secondary aluminium industry for almost 45 years, i have made my fair share of alloy for castings. The quantum leap between metal made today and pre 1980`s is the electronic spectrograph and flux injection. The one gives you a accurate analysis quickly, the other cleans the metal to a much higher standard which eliminates inclusions and reduces potential porosity. Metal temprature is also more accurate with moden digital pyrometers. Pre 1980`s metal was made to a specification were the only reliable way of testing for the elements was wet analysis which could take days to complete, or carbon rod spark erosion which was measured against a graph which gave irregular readings.
AMAL carbs were made from Mazak, a zinc alloy which has stood the test of time as being the best for that application. A very good friend of mine ran the foundry.
Rolls Royce as far as i can remember had their own foundry producing castings, the quality control would have been much higher than for the normal run of the mill motor indusry.
We were melting new, crated, packed in silica gel RR piston aircraft engines up till 1971.
AMAL carbs were made from Mazak, a zinc alloy which has stood the test of time as being the best for that application. A very good friend of mine ran the foundry.
Rolls Royce as far as i can remember had their own foundry producing castings, the quality control would have been much higher than for the normal run of the mill motor indusry.
We were melting new, crated, packed in silica gel RR piston aircraft engines up till 1971.