ROB BONDY
New Member
i have a 2001 40' sea bridge with 450 hp cummins 6cta. I ran the boat at about 1600 rpm for a slow trip and had black soot all over the back of the transom. Cleaned up the mess and ran home at cruising speed (2100 rpm) and the transom was clean. Is this something i should be worried about or just try to stay away from certain rpm where the turbos are quite kicking in?