Dart aluminium engine has 0.00275" main bearing clearances cold (2.75thou)
I am interested to know if the main bearing clearances increase HOT possibly 0.001" more or less??
Going by some
oil companies
oil viscosity recommendation of over 0.003" main bearing clearances use a 50wt
oil and under 0.003" use a 40wt, that may put me in the 50wt oil category.