How much compression should a 5.9 Cummins have?
How much compression should a 5.9 Cummins have? Consistent Pressure Is Key The minimum pressure spec for a 5.9L Cummins is 350 psi, and in an ideal world, you want all cylinders to read within 10-percent of each other. As a general rule of thumb, most mechanically sound engines will build more than 400-psi per […]