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Old 07-17-2017, 07:48 PM   #1
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Default 1999 3300 SCR not getting on plain

I have a 1999 Maxum 3300 SCR with 454 7.4L Mercrusiers and Bravo 3 drives. I have owned it for ~4 years now and it's always been a struggle getting on plain. I have had it tuned up, new fuel filters, fresh antifoul paint on bottom and still doesn't get on plain very well. If it's just my wife and I on the boat it get's on plain, but a little slow. If I have maybe 6 adults forget it. Is anyone else having this problem? I would have thought with the big blocks it would have jumped out of the water (even given the heavier weight). Can other 3300 boat owners let me know if they have this issue (mostly those with a similar engine and drives). Thanks for any help anyone can provide.
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Old 07-17-2017, 07:56 PM   #2
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With twin 7.4L engines, that boat should get out of the hole quickly. My 3200 SCR with twin 7.4s has plenty of get up and go.

However, every once in awhile, my boat bogs and can't get on plane. Every time this has happened, it's because the outdrives have somehow been trimmed wrong (often after my mechanic has been working on it). I solve this by trimming the outdrives all the way down, then trying to get up on plane, then retrimming them as necessary to even out the ride. Give that a shot and see if it works.

Otherwise, you may need to have your outdrives, props, and trim tabs checked out for damage and wear.
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Old 07-17-2017, 08:38 PM   #3
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Try going to a 4 bladed prop. I had a buddy who's boat was a pig. He called the guys at Hill Marine and bought a set and it made all the difference in the world on the boats performance.

Hill Marine will guide you in the right direction. They are good people to work with.
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Old 07-17-2017, 09:28 PM   #4
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Thanks for your reply, I have 3 blade 48-823665 24P stainless steal props by Mercury Marine. Any idea if these are stock.
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Old 07-17-2017, 10:09 PM   #5
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These are dual props aren't they? Is the pitch correct? Do you put your trim tabs down ? That helps bigger boats get up on plane!

Roger
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Old 07-17-2017, 10:31 PM   #6
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24 pitch should be pretty close to stock. I think mine are 23P. They may have changed the pitch with the model change from 3200 to 3300 (which is otherwise essentially the same boat).

I still think it's either your outdrive angle or tab trim creating the problem. Play around with the trim settings and see if you can get it out of the hole faster. Outdrives all the way down and trim tabs flat or slightly down ought to do it.
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Old 07-17-2017, 10:47 PM   #7
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Out drives should be all the way down. Trim tabs down also. Throttle should be agressively hammered down and off you go! Have you had a prop specialist look at your set up?

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Old 07-17-2017, 10:52 PM   #8
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Quote:
Originally Posted by biggerseagar View Post
Out drives should be all the way down. Trim tabs down also. Throttle should be agressively hammered down and off you go! Have you had a prop specialist look at your set up?
Good point about the throttle. My boat needs to be at 3200 rpm to get on plane. I throttle up to that as quickly as I can without giving my passengers whiplash or kicking them overboard.
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Old 07-17-2017, 10:52 PM   #9
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What is the WOT with just you and your wife and again with 6 passangers?

What size trim tabs do you have? Drop fins may help.

Twin big blocks should not be such a problem. How much gear is on board?

Are you certain the engines are healthy, compression test, ....
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Old 07-18-2017, 03:33 AM   #10
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I have a 2004 3300 with 5.0 bravo 3 duo props. No issues getting on a plane. Outdrives almost all the way in and tabs half way down. Cruise at 3200 rpm on a plane at 19/20 knots
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