1979 Sea Ray 268 with heat exchanger, engine temperature will not get below 190 degrees at 3000 RPM cruising speed. I have two different log style exhaust manifolds. Port side manifold has large water passage cross section where the starboard manifold has a small water passage cross section. Port side manifold temperature stays much cooler than the starboard side.
How do I fix this problem? Buy two new log manifolds with large or small water passages? Convert to center style manifolds? Do center style manifolds have less exhaust back pressure and do they perform better than log style? I'm getting ready to do something but not sure what to do, any suggestions?
How do I fix this problem? Buy two new log manifolds with large or small water passages? Convert to center style manifolds? Do center style manifolds have less exhaust back pressure and do they perform better than log style? I'm getting ready to do something but not sure what to do, any suggestions?