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Re: 1989 Merc 7.4's RPM's
Posted: August 9th, 2017, 5:11 am
by Samuel
I didn't realize the lake was that small.
Re: 1989 Merc 7.4's RPM's
Posted: August 9th, 2017, 7:32 am
by mjk1040
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!
Re: 1989 Merc 7.4's RPM's
Posted: August 11th, 2017, 5:43 am
by tonyiiiafl
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!
Re: 1989 Merc 7.4's RPM's
Posted: August 11th, 2017, 8:10 am
by sep4086
The boat might have the wrong size props.
Re: 1989 Merc 7.4's RPM's
Posted: August 14th, 2017, 4:39 pm
by Grady2011
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.