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Old 09-25-2015, 04:38 PM   #1
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Default My first boat; 2001 1800SR

Hi everybody,
My name is Mike, and recently bought this pretty nice, used 1800SR. I don't know a lot about it, or any other boats for that matter. Lucky for me, my brother used to have the same model/year Maxum, because the owners of the aircraft carriers I was deployed to years ago wouldn't let me drive them and offered no training. Their reasoning was, that I was on board to work on the F-14s and not the ship itself. The nerve.

As for the 1800SR- I have the manuals for it, and plan to learn a lot, if all the standard boat "jokes" I've been deluged with are true.

So far we've taken her to the lake twice, and it's been a blast. Since she is nowhere near new; I anticipate having at least some issues. I hope that isn't a gross understatement.

I have spent a few hours just reading through some topics and posts here, to get a feel for your website. I appreciate the literature section as well.

I will now go forth and display my ignorance for all to see, by posting a question about the engine performance. Thanks for being here,
Mike
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Old 09-25-2015, 05:23 PM   #2
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Mike welcome aboard

Post some pictures of your new toy.

What is your question regarding engine performance and what engine do you have?
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Old 09-25-2015, 06:41 PM   #3
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Mike welcome aboard

Post some pictures of your new toy.

What is your question regarding engine performance and what engine do you have?
Thanks Mike,
I haven't taken any pics yet, but this weekend I will, and post them.
It's MerCruiser 4.3 liter v6 with 2 barrel carb, About 200 hours. It runs great until you reach wide open throttle, where the tach reads about 4800 rpm. At wide open, it begins to make a popping sound, sounds like from the exhaust but not sure. As soon as you back off the throttle just a tiny amount, it runs great again.
I had thought could be bad plug(s), wires or cracked cap or rotor. After replacing plugs, wires, cap and rotor, as well as the spin-on water trapping fuel filter, it has not changed.
I just now became aware that there is a gas filter in line with the fuel inlet line on the carb...I will change that asap.
Any suggestions would be great!
Thanks in advance.
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Old 09-26-2015, 12:15 AM   #4
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Sounds like you are hitting the rev limiter threshold that is there to protect the engine from over revving. You should not run at WOT for more than a few minutes anyway as it is not designed to run under load for extended periods at this rpm. Cruising rpm is typically no higher than 4000 rpm.
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Old 09-27-2015, 01:29 PM   #5
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Sounds like you are hitting the rev limiter threshold that is there to protect the engine from over revving. You should not run at WOT for more than a few minutes anyway as it is not designed to run under load for extended periods at this rpm. Cruising rpm is typically no higher than 4000 rpm.
Thanks Mike,
I appreciate your reply.
I was told by the PO that's what the repair shop had told him when he took it in for a checkup before selling it to me. I wanted to double check since I have no receipts or any proof from them.

I do understand it's not good to run an engine at WOT for extended periods, it's just a thing we did only for a few seconds, curious to see if it was really happening, and what may be the reason for it, as a part of the test drive prior to purchase.

The thing is not like the rev limiters we've had experience with on car engines. This one seems pretty "random" in the way it works. The pop sound is not consistent in tone or volume or frequency. It really sounds more like the often random sound of arcing plug wires.

I'm not disagreeing with you...just asking if they are normally like this? I'm asking because my brother's 1800SR he bought new in 2001 (identically equipped to the 2001 1800SR I just bought used) did not operate in this manner. If it had a rev limiter, it did not make itself obvious in any way.
Was that an exception?

Is there any sort of standard way of dealing with this that other owners have?
Can the throttle components be adjusted to limit the WOT rpm, rather than allowing RPM to reach the limiter?
It's not that I want to blow it up, obviously, but being a guy who appreciates performance, the occasional urge to just let it rip is bound to happen. Not for all day, but just a few seconds once in a great while.

Another thought: it seems somebody changed the prop at some point. I'm thinking if I replaced the prop for a one degree more, It could keep the same top speed while holding the RPMs down below the limiter point. Does that seem like an idea worth trying?

Thanks again for your time, and sharing your knowledge.
Mike
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Old 09-27-2015, 02:08 PM   #6
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Mike you hit it at the end, this engine should have a WOT of 4600 - 4800. If you increase the props pitch one up from the current prop you should drop the rpm to the correct spec.

I cannot explain the difference between the two boats. Yours may also have a valve that is starting to float (not returning to full closed) at this over revved rpm.
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Old 09-27-2015, 02:22 PM   #7
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Mike you hit it at the end, this engine should have a WOT of 4600 - 4800. If you increase the props pitch one up from the current prop you should drop the rpm to the correct spec.

I cannot explain the difference between the two boats. Yours may also have a valve that is starting to float (not returning to full closed) at this over revved rpm.
Mike,
Thanks again for your time and knowledge. It's very helpful and I certainly appreciate it.
I have a feeling I will learn a lot from you and others here.
So, now when I have anymore questions, I should put those in the appropriate sub-forum, correct?
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Old 09-27-2015, 02:25 PM   #8
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Correct and I am sure you will provide valuable info to the site as well.

I'm just a fellow boater who is an old gear head but far from a expert, just enjoy troubleshooting issue expecially when they are not mine.
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Old 09-29-2015, 08:02 AM   #9
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Hi mmwjr,
Picture, as requested...
Mike
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File Type: jpg 20150926_101540_Los Coches Rd-small.jpg (198.1 KB, 30 views)
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Old 09-29-2015, 12:28 PM   #10
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Hi Mike you can call me Mike as well.

Nice looking boat, what is that picture on the bow looks like a duck.
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