1989 Merc 7.4's RPM's
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mjk1040
- Admiral
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Re: 1989 Merc 7.4's RPM's
I saw a survey like that here in our Marina, and half way in at WOT, Poof! And blue smoke everywhere! And OH S**T! They didn't notice it for what seemed quite a while. Then lip her back in on one engine. Anyone can be a surveyor, but some should not!
Mike 
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
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tonyiiiafl
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Re: 1989 Merc 7.4's RPM's
I am a diesel mechanic and bought a gas 390 CPMY. I just don't do the hours per year to merit the premium price of a diesel. I also have 454/7.4 Blue Water Mercs, I hit 3800 WOT and was happy with that. usually run at 2800 to 3000 19 kts. Plenty fast for a boat this size!
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Grady2011
- Scurvy Dog
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- Vessel Info: 1989 Carver 3807 Aft w/ Twin 7.4 Mercs and Kohler 9Kw Genset
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Re: 1989 Merc 7.4's RPM's
So I got her back out on the water and eased up to WOT to see what it would do again. Last time I did that must have cleaned some of the junk off of the bottom and cleaned up the carbs a little. Lol. She would hit all around 4300 rpms. I didn't keep it WOT very long but it did make me feel better! I like cruising around 2500rpms.
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