Hi All,
Have really enjoyed reading all the great info in this thread. There seems to be quite a few very smart people following this thread, so I was hoping someone can answer this question for me. I am using a 5 x 1.3 piston with 37.5wt oil and am happy with the performance but would like to try a 4 hole piston with a lighter weight oil. Is there some formula that can be used to figure out what size hole and wieght oil can be used to achieve a good starting point to have approximately the same performance (i.e. pack)?