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Old 09-01-2014, 07:39 PM   #1
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Cool 1993 Maxum 1900SC with a 5L MerCruiser engine => Time to Plane

Hi Team,

Glad to become a member here to help out a Buddy. (I have a Larson at the Lake so please don't mind...) I hope one (or more) of you can chime in with good advice here.

I've been a boater all of my life (now 60 ...dam where's the time go...) so when my friend got a "Family Discount" (a second cousin on his wife's side) on a 1993 Maxum 1900 SC with a 5L Alpha 1 MerCruiser engine, it was decided I'd be his "go to" support. This is his first boat (he's 53) & he bought it without one of his more knowledgeable buddies along for advise - as he didn't want to offend the family. (I advised him to at least get one of us on a test ride, and then pull the boat onto the trailer for a look around. He didn't do it and I hear the Trailer is pretty rough.)

This boat has had a single owner since 1996 and was used almost exclusively by a family to transport them & supplies to their water only accessible Cabin up Indian Arm (off of Burrard Inlet in Metro Vancouver - connected to the Pacific Ocean). It was not used to pull Skiers or Tubes. My first ride in the boat was a week after purchase.

I was amazed how slow it seemed for this hull to get on plane => and how much the Bow rose obstructing the view forward, and was looking for any stock numbers, or good calculated values for reference. I'm assuming there's all kinds of crap on the bottom even thought there is evidence of bottom paint. The boat also seems to not like to plane unless it's going pretty quickly (about 3/4 throttle) - the Speedo doesn't function. (I have an idea how to check this out and will use a GPS until sorted.) The boat also seems a bit snaky if trimmed up to about 3/4 on the dial. There is also a known issue (probably with wiring / connections / limit switches?) about a failure to turn the starter unless the shifter is wiggled prior to turning the key.

My friend knows he's taking a risk on getting such an old boat but the price was right and the 2nd cousin said they'd help out if there was anything major needed in the short term.

Do you have any words of wisdom that would help us out here?

Thanks for the assist.

Regards,

Jim
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Old 09-02-2014, 02:20 AM   #2
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Jim welcome aboard.

Small boat with a heavy engine will give bow rise. Several folks have installed smart tabs and been happy with the results.

Not sure I am following the starting issue but it sounds like the natural safety switch in the shifter, this prevents cranking unless the shifter is in neutral.
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Old 09-02-2014, 05:26 AM   #3
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Thanks for the welcome & input. I too suspect some loose connection, corroded switch, or a surprise, in the shifter assembly causing the intermittent starting issue. I'm a licensed Electrician with Electronics Technician level training (some years ago) so I'm not too worried about this issue.

I do realise the physics involved with the bow rise, but it seems just far too long to me before it comes down and onto a plane. I'd like to have some reference times for other Maxums so I don't go spouting off to my Friend without substantiated data. I think I've read every post I could find on the 1900 (SC or otherwise) and can't see much on this subject. If it was normal I thought I'd hear grumbling of some sort. I have seen posts on various Tabs and Plates to put onto the Leg (Outdrive) and I may suggest we put on something like that after the season as my friend has it at his 1/4 shared dock in Bedwell Bay and doesn't want to take it out with only two months left in the season as he just got it a few weeks back. The plan is to pull it before Halloween and store it in his Father-in-Law's carport nearby.

How many seconds from the time initiating WOT to plane would be normal for a 5.0 L MerCruser pushing a 19 foot boat?
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Old 09-02-2014, 12:51 PM   #4
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I would be more interested in seeing what the Max. RPM on the boat. Time to plane it somewhat irrelevant. Time to plane can be reduced by dropping pitch in the prop. We don't have the information to determine whether the boat is properly propped at this point.
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Old 09-02-2014, 12:58 PM   #5
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Jim I agree with shrew that knowing WOT for the boat will much more helpful, additionally I am sure other with this size of boat will chime in on their inputs on time to plane.
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Old 09-02-2014, 06:00 PM   #6
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Gents,

I'll ask my friend for the WOT RPMs but it may take a few days until he's out on the water. (It's raining.. )
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Old 09-03-2014, 01:14 AM   #7
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-Jim-,
I have a 2000 1900SR with a 4.3 V-6 with a 23P prop, so I may be able to give some perspective. I have smart tabs (added them myself within a year) to control bow rise and lower on plane time. I never timed how long it took to get on plane, but the tabs were needed. You need to ensure the drive is trimmed all the way down, any up will absolutely kill your hole shot in this boat. You do need to "give her some" to get on plane. You may even need to check that the drive is going all the way down. If the drive goes up to 3/4 on the dial without cutting out the trim motor, making you use the trailer button to raise it further, there may be something wrong with the trim limit switch on the drive. This is a safety feature to ensure the boat is operated safely and in control. Also, your startign issue may have less to do with the neutral safety switch and more to do with a slave solenoid in the starting circuit that doesn't work every time you turn the key.

Keep us posted.
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Old 09-10-2014, 06:55 AM   #8
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Hi Gents,

Thanks again for the posts.

I was away on a Cruise to Alaska for the last week so I'll follow up. My Friend came back with incorrect info (probably by memory) with RPMs far too high while I was away. My understanding is the 5.0L MerCruiser should be about 4200 - 4800 @ WOT.

Also I understand there is a two part Service Manual is #17 90-823225--1 1993-1997 Engines - GM V8 305 & 350 CID (5.0L 93-95) applicable to this boat but I can't seem to find a free download even though it's 20+ years old. Can any of you help out there?
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Old 09-14-2014, 07:02 PM   #9
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http://boatinfo.no/lib/mercruiser/ma...ser41.html#/17
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Old 09-16-2014, 08:52 AM   #10
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mmjr,

Thanks for the link. It's a great site but I was hoping for a downloadable (pdf?) version to take on board when needed. By the way, my friend' Misses had to gointo hospital last week so the Boat is definitely not in his priorities at the moment.
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