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ContinuousWave: Whaler Performance
Raise engine on Newport?
|Author||Topic: Raise engine on Newport?|
posted 02-18-2003 04:25 PM ET (US)
I just purchased a 1984 Newport with a 1995 Johnson 88hp. The engine was just rebuilt but that does not mean it was removed from the boat, could have just removed the powerhead. Now the engine is mounted on the transom using the "blind holes" on the lower. Should I raise it up a hole or 2 holes? Will the bolts line up with the area below the blind holes? Basically I want to know if the blind hole mounting is the same as non blind hole mounting pattern.
Will raising it make it perform much better? I know jack plates help, etc but will 1-1.5 inches make a big difference? I just do not want those bolts to snap, then I have to remove the engine, etc. I am currently getting about 5270rpm's at WOT with 2 people, a full tank of gas and a 17" prop, bottom was not the cleanest but is now, I will re-run the boat before I raise to compare.....ideas....thoughts?
posted 02-18-2003 04:59 PM ET (US)
The blind holes do not line up with the lower holes, at least not on a 90 hp yamaha. When I installed the Hydraulic jackplate I had to fill the blind holes and drill new ones. I believe that raising it up will make a difference in RPM's.
posted 02-18-2003 05:05 PM ET (US)
I think that this is a first for the Continuous Wave Forum. Bigshot is asking a question, as opposed to answering a question. This is not meant to be derogatory in any way, because I think Bigshot's answers are generally quite helpful. Cheers.
posted 02-18-2003 10:26 PM ET (US)
I have a 1988 88hp spl on my 1988 Newport. The motor is not mounted w/ the blind holes. I am traveling in Upstate NY until Sat but would be more than happy to tell your how the motor is mounted when I return. Before the motor crapped out I got about 38mph with Stabliizer fin on it. Sea Ray? not sur of the brand.
posted 02-19-2003 02:33 AM ET (US)
Bigshot, where is the anti-ventilation plate in relation to the bottom of the transom?
posted 02-19-2003 07:59 AM ET (US)
I have not yet raised the 1988 Evinrude 70 hp on our 15' from the blind holes (mounted all the way down), but when I inquired on this board about it I was told that the blind holes do line up with the regular ones, at least on OMC. See http://continuouswave.com/ubb/Forum4/HTML/000772.html
posted 02-19-2003 08:57 AM ET (US)
Anti cav plate is about dead even with the hull. Normally i would not ask but I was bored. I could just get out a ruler and see if the bolt pattern is the same as my other 17' but that would take time and energy. I am also apprehensive that those blind bolts might snap and then I just turned a mole hill into a mountain.
Boat is really sharp! Gonna have to get her wet and put some time on it and decide if I really do want the Newport over the Montauk like I always said I did. I love the setup but I have to see if it is comfy to drive standing up, etc.
posted 02-19-2003 11:11 AM ET (US)
There should be 3 sets of holes at the upper section, & a channel or slot for the lower .
Even if the bolts snap, just drive them through with another of the same size or smaller, the replace with the correct size.
The higher the engine, the flatter your boat will run, without leaping like a frog.
You will gain about 100 rpms per hole.
You may need to change props, as a stock omc prop will break loose sometimes, where a Stiletto wont.
posted 02-19-2003 11:21 AM ET (US)
I believe there is 4 holes and the lower slots. Not worried about snapping the upper bolts because i can do what you say, it is the lower ones in the blind holes that I will have to remove the engine to extract that are concerning me.
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