I know I had a formula written down somewhere (probably in 8th grade about 1953) to calculate how much castor to add to a given volume of fuel, with a given amount of lube already in it, to raise it to another level (%by volume).
For example: I want to raise 1 gallon (128 oz.) of fuel, which has about 18% (23.04 oz.) lube in it, up to 28% lube.
Considering that whatever you add will raise the total volume which makes the total% a moving target, there was a specific formula that I had at one time.
How do I calculate how much much castor, by volume, to add?
Phil AMA609