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In my last thread “cracked exhaust” I mentioned that my exhaust cracked, filled my engine room with soot, clogging my starboard air filter and brought me off plane to limp home on the port engine.
Key is that I was on plane.
Replaced the exhaust and cleaned the air filters, but could not get back up on plane. Removed the air filters completely for about 60 seconds to see if that would make a difference. It did not. Max RPM achievable was about 1600 on starboard and 1800 on port. It felt like the starboard motor was holding back the port motor.
Laser tach yesterday says my console tachometers are bang on at lower RPM and then start to vary by about 100 RPM at I reach WOT in idle. Both tachs are off almost the same.
For instance
Starboard Port
VDO Laser VDO Laser
600 = about 600 600 = about 595
1500 = about 1550
2200 = about 2300 2200 = about 2275
2800= about 2900
3050= almost exactly 3150 3040 = about 3125Once again I was on plane when this happened. Boat sits on a lift, so bottom is clean.
Props have not been touched since this event (granted they were dynamically tuned just before the event and she seemed to come on plane slower, I might need to fine tune them a bit more).
Lots of black smoke.
Is it possible I clogged the after cooler and I am still not getting enough air under load?
Any other possibilities?
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