Up next in 10
From 3 Outboards To 4!
109 views
Aug 16, 2024
Learn More About Your Boats Systems By Joining The Born Again Boating Academy! https://www.bornagainboating.com/ Get Your Born Again Boating Clothing! https://www.bornagainboatingshop.com Get Savings On Boat Parts With BAB Coupons At Partsvu Here: https://shareasale.com/r.cfm?b=1991037&u=3159438&m=119617&urllink=&afftrack= Please Buy Anything From This Link To Amazon & Help Us Keep Bringing You Content!!!! https://www.amazon.com/?&_encoding=UTF8&tag=bornagainboat-20&linkCode=ur2&linkId=97bb1968e1ac47dfc3703d401d95fb5a&camp=1789&creative=9325 Subscribe To Our Podcast! The Boater's Podcast: https://www.youtube.com/channel/UC6Y2xnr23ERD2n_t51Jv4-Q?sub_confirmation=1 ------------------------------------------------------------------------------------------------------------------------------------------------------------- PARTS USED: ------------------------------------------------------------------------------------------------------------------------------------------------------------- DONATE Paypal: https://www.paypal.me/bornagainboating ------------------------------------------------------------------------------------------------------------------------------------------------------------- JOIN THE BORN AGAIN BOATING COMMUNITIES!
View Video Transcript
0:00
If your first two questions are why, and how much faster does it go
0:05
The first answer is why not, the second answer is about 10 miles an hour
0:10
And this is a broken steering wheel. Welcome to the story of changing a triple engine boat into a quad-engine monster
0:30
Now this will actually also apply to any configuration of outboards you do when it comes to changing up the configuration
0:52
Doesn't matter if you're going from a single to twins or from twins to trips or like we are here from trips to quads
1:00
The absolute most important thing about this entire deal is going to be in the alignment
1:05
of the mounting holes, which is why we are going to get straight into the meat of the video
1:09
and go ahead and skip over the derogging of the boat with this short little montage of some
1:14
of the wires being pulled out. This one then
1:27
Then we'll also go ahead and just snatch these engines off the engine. back of the boat as well
1:33
Gently set these biscuits down into the bed of this pickup truck and onto this here U-Haul trailer
1:38
getting us down to this right here, a beautifully clean transom. Now in order to make this swapover, what we need to do is clean up the transom
1:45
Since we are going to be switching up the configuration and adding an engine, we need to fill
1:50
up all of these holes, including the holes where the rigging is coming out of the boat, since
1:55
we are going to be moving them around in order to make them symmetrical
1:58
seeing how there are now going to be four holes here for the rigging instead of three
2:03
We're also going to be getting rid of these underwater lights here which were a real struggle
2:07
to get out of the boat. As the standard goes, they were completely embedded in 5,200 and did not want to come out
2:17
So we had to persuade them to come out by simply letting them know that we weren here to rob them and that we didn want their money Then just like that we have a completely empty transom leaving a perfectly suitable canvas for the fiberglass guy to come over and fill in all of these old holes
2:34
With that all taken care of though, we can go ahead with the most crucial part of this here
2:38
project being the actual measuring and aligning of the engines and where to drill out the
2:44
mounting bolt holes. Obviously enough space on the back of the boat is going to be
2:48
needed for this kind of project to work. But this model of boat would actually come with a set of quads on them, so we already know
2:55
that there is plenty of sufficient space for the fourth engine. And the Transom is also already rated and strong enough to support the weight and power of
3:04
our new set of power plants, leaving us with just this task here of cleaning up the Transom
3:09
to get it ready for us to make the holes. In order to make the holes in the right location, we will be using this mounting bracket
3:16
template that is specifically made for drilling out the holes in a transom for an outboard
3:21
But the perfect placement of this template is going to be critical
3:25
To kick off this party, we need a couple of pieces of information. Number one, we need to figure out where the center line of the transom is, and number two, how far
3:35
apart are our engines going to be mounted? The process of finding where the center line of the boat is is actually pretty easy
3:41
We just need to take a string and a pencil or a marker or something like that and go from the corners of the boat and the strakes and make arcs in the middle of the transom
3:51
We'll want these arcs on the top and bottom in the middle of the transom from both sides of it so that the arcs will interconnect with each other at a specific spot in the middle of the transom
4:02
which is going to give us our exact center line of the transom that is also in line with the keel of the boat
4:09
Then we can take a straight edge going from where the arcs cross on both the top and the bottom and mark a line down the middle of the transom
4:17
This is what gives us our reference point for the center line of the boat
4:21
We have to do this because we need the engines to be straight on the back of the boat
4:25
That is, if you don't want them to be crooked, which can make the boat pull or steer to one side or the other when you are running it
4:32
Now for the second measurement, this is pretty easy too. because it's a pretty common number when we start talking about trips and quad outboard boats
4:40
even twins too. But it super important nonetheless because different engine models have different measurements on how closely they can be mounted to each other The spacing of the engines is rather common with many models being 26 inches from center to center
4:55
That just means that from the center of the engine bracket to the center of the next engines bracket is going to be 26 inches apart
5:03
Now the Yamaha F350s that we just took off, those have a minimum spacing of 28 inches
5:09
Unlike the Mercury V8s that we're going to be putting on, which have a minimum of 26 inches apart
5:15
This is important because if you put them too close together, then the engine cowlings will rub together when you are turning
5:22
tearing up that beautiful paint job as well as impeding the turning ability of the engines and the boat
5:28
So now that we know where the center of the transom is and how far apart our engines are going to be
5:33
we can go ahead and start this process of drilling out our new bolthole patterns for the engine mounting bolts
5:39
that we are going to be mounting the engines 26 inches on center from each other, we can
5:44
divide 26 by 2 to get 13 inches. And then what we'll do is measure 13 inches towards each side of the boat from our center line
5:54
We'll do this towards the top of the line as well as somewhere down towards the bottom of
5:58
the line, roughly about where the top and the bottom of the bracket is going to go so that
6:03
we can get another line here where the center of the template is going to line up with, keeping
6:08
our templates straight up and down and thus keeping our engines straight up and down on the boat
6:13
With those two lines marked, we now just need to measure 26 inches to the outside of both the
6:18
lines that we just made for our port and starboard inner engines
6:22
This is going to mark where our port and starboard outer engines are going to mount up
6:27
Now some transoms are going to have this dip here in the middle, which can cause you some aesthetically
6:32
lower engines for the center engines, but that's just what it is here
6:35
So we'll go ahead and drill out all the holes for all the engines. by centering up the bracket template on each of our engine center lines
6:42
making sure that we use the engine lines that we just made and not that first center line of the boat that we made
6:48
because that would be very unfortunate. We'll drill out each mounting bolthole
6:52
and with all of these drilled out now, we can go ahead and mount up all four of our brand new engines
6:58
and then we'll go ahead and skip over the rigging of the boat as well with another quick montage
7:05
Now if you enjoying this project and want to learn more go way more in and more step of specific projects in our boating academy at born if you like to check that out so with the boat rigged and the engines mounted
7:21
we can splash the boat and take a look at some of the test run results now mind
7:25
you we didn't have any propping done with these results and the boat was loaded
7:30
but with the four 300 horsepower V8s we ended up getting around 57 to 58
7:36
800 RPM out of the engines, which puts us at the absolute minimum of the RPM range that these engines should be getting
7:44
between 5,800 and 6,400 RPM, which means that this is a little under-propped being on that low end of the range
7:51
At this RPM, we were getting around 56 to 57 miles per hour, though we did briefly see 60, and it was drinking about 107 gallons of fuel an hour
8:01
comparing that with the Yamaha V8s where we were running wide open at about 45 to 46 knots or about 5,152 miles an hour, running at around 58 to 5,900 RPM, which is right at the top end of the range for the Yamah's because those engines range is from 5 to 6,000 RPM
8:21
But we were burning roughly 99 to 100 gallons an hour, with the boat completely unloaded, though
8:27
But where the real noticeable difference was was in the cruising speed range
8:31
Now with the right props on the boat and the RPM up towards the 6,400 mark on the Mercury's
8:37
you'd probably see more consistent, low 60s, maybe even some mid-60s. But that would be with the perfect conditions and there would be a little bit higher fuel consumption as well
8:46
But it was really the cruising speeds that showed the difference. Because with the quads, we were cruising at around 40 miles an hour, running 43 to 4,400 RPM
8:56
burning about 50 gallons per hour. Whereas with the trips, we were doing about 40 miles
9:01
an hour, running around 5,000 RPM, burning about 62 gallons per hour, which is a pretty
9:08
massive difference, with about 10 to 12 gallons less and about 5 to 700 RPM less
9:14
I mean, with the right props and t, you could probably even push those numbers even
9:19
farther apart and be more like 41 to 4200 RPM and maybe mid-40s on the fuel burn
9:25
So we're talking around a 15 gallon per hour difference in fuel burn when cruising, and I think
9:30
that that is probably the biggest comparison point that anyone could bring up
#Boating
#Boats & Watercraft
#Vehicle Repair & Maintenance