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Cruise RPM is around 3300-3400, and WOT is aroung 4300-4400. The boat just touches 36 knots, at sea level with light chop, at WOT. It is a stable, exciting ride in a boat that size. Charlie

We have a 2003 380 with 8.1s and only about 180 hours on the engines and the boat works magnificently with them. The boat planes at 17-18 knots with almost no bow rise, and cruises very comfortably at 25-27 knots. My fuel burn at that speed on the computer is around .8 nautical miles per...

I have a 2003 380 with 8.1s. The aluminum manifolds have some salt accumulation, which caused an overheat condition on the outboard manifold in the port engine. My service guy has told me that the factory has a retrofit cast iron manifold (around $500 per manifold) that is now the recommended...

It's interesting. Mercruiser on its website recommends flushing the engines after saltwater use, and then goes on to say that they don't have a kit for that purpose on inboard engines. Perko has a system called "Perko Flush Pro." (Sounds like something from the Vacuflush people...) that is...

I have a 2003 380 DA with 8.1S Horizons. I mentioned this in a previous post, but would be interested in knowing how many out there routinely fresh-water flush their risers and manifolds. My service guy has suggested a flush attachment, and apparently Perko has a valve that looks like it...

Thanks for the responses. I do have a 2003 380 DA, located in Sunset Beach, California. This is just north of Huntington and Newport, at a marina called Peter's Landing. And my key is kept...oh wait, probably too much information.

First, thanks for the replies to my previous concerns. Being out of town, our boat sits for relatively long periods of time between uses. I do have a West Marine evaporator that I leave plugged in when we are not there, but I was thinking of having the AC cycle daily (or some period of time)...

I am new to this list, and have a couple of questions for the experts: 1. My engines are 8.1 Horizons. The port engine was overheating, which was traced to salt buildup in the seawater side of the cooling system. In reading the owner's manual, there is a procedure for "Flushing the Power...