Merc 80 Jet Enough for my 1860??

flex2win
Posts: 13
Joined: 30 Mar 2015, 22:59

Merc 80 Jet Enough for my 1860??

Post by flex2win » 25 Aug 2019, 21:46

Currently running an Alumacraft MV 1860 w a 50hp Merc 4 stroke, Atlas Micro Jacker, Solas 11p Stainless. I see 32mph right now with this set up.
Things have really changed w water levels and I'm contemplating flipping to a Jet. Boat is 625, motor 250, I'm 230.
River where i run is rocky, sandy, and TONS of hidden logs waiting to eat up your lower unit.

But I have some questions.....

--Is the Merc 80 enough to move this boat?? Would it be enough to move a 2072 if I went that route?

--I've also considered moving my boat and jumping to a 2072 platform, putting a 90hp Merc on the back and just buying the kit to convert it over late summer if needed.

--Is this boats hull okay to run a jet, or is cavitation going to be an issue?

Sorry for long post, just have a lot of stuff to consider. I've read a ton on jets and trying to get as much info as possible to make a decision.

Thanks for the input.

Xtremeboats
archery68
Posts: 162
Joined: 14 Sep 2015, 21:02

Re: Merc 80 Jet Enough for my 1860??

Post by archery68 » 25 Aug 2019, 23:02

I’m not an expert. My opinion only. I think the 80 would work on your 1860. Depends of course how much gear your going to have, and also how many other people. I’m saying this only if it’s the factory jetted 80. The factory 80 jets are 115 hp motors but are 80 at the Jet/pump. That would be the biggest boat I would put it on. Most folks where I live run the the 80 jets on 1856’s. They perform really well, in fact that will be my next setup. The 2072 would be to big in my opinion. Would be sluggish, slow to get on plane. If you put a 90 prop on your boat and added the jet later that would drop the the hp to right at 65 hp at the jet. You lose that much with jet conversion. The 90/65 would not be enough motor for a 2072 and might not be enough for the 1860. I run the current river in Missouri. Lots of folks running the merc 115/80. Parts of current river has hp restrictions of 40hp so I run a 60/40 merc 4 stroke on an 1852 .80 gauge Blazer SS with a tiller. By myself 34 downstream and 31or so upstream. Put my family and our crap in there it drops big time. My point is I have to watch where I put all our stuff and distribute the weight. They just don’t run like props. Hope this has helped.


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flex2win
Posts: 13
Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 26 Aug 2019, 17:54

archery68 wrote:
25 Aug 2019, 23:02
I’m not an expert. My opinion only. I think the 80 would work on your 1860. Depends of course how much gear your going to have, and also how many other people. I’m saying this only if it’s the factory jetted 80. The factory 80 jets are 115 hp motors but are 80 at the Jet/pump. That would be the biggest boat I would put it on. Most folks where I live run the the 80 jets on 1856’s. They perform really well, in fact that will be my next setup. The 2072 would be to big in my opinion. Would be sluggish, slow to get on plane. If you put a 90 prop on your boat and added the jet later that would drop the the hp to right at 65 hp at the jet. You lose that much with jet conversion. The 90/65 would not be enough motor for a 2072 and might not be enough for the 1860. I run the current river in Missouri. Lots of folks running the merc 115/80. Parts of current river has hp restrictions of 40hp so I run a 60/40 merc 4 stroke on an 1852 .80 gauge Blazer SS with a tiller. By myself 34 downstream and 31or so upstream. Put my family and our crap in there it drops big time. My point is I have to watch where I put all our stuff and distribute the weight. They just don’t run like props. Hope this has helped.


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Nope, your opinion matters. This is the kind of feedback I've been looking for to.
What kind of mileage(not that it is a deciding factor) are you seeing with your motor?

It sounds like I'm actually going to get to go with a guy that his this motor on his 18' Alweld

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RiverBottomOutdoors
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Re: Merc 80 Jet Enough for my 1860??

Post by RiverBottomOutdoors » 27 Aug 2019, 00:45

80 at the pump or 80 at the engine? 65 at the pump is the absolute lowest I would go for a 1860 coming in around 700-900lb dry weight.

Maineman750
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Joined: 29 Nov 2014, 17:22
Location: Liverpool,Pa

Re: Merc 80 Jet Enough for my 1860??

Post by Maineman750 » 27 Aug 2019, 15:39

I'm running an Optimax 80 Jet on an 1860 G3 right now and have plenty of HP for running the shallow and rocky Susquehanna river in the Harrisburg/Liverpool area. I have it rigged with a 36V trolling motor so there are 4 batteries and I guide two clients on a regular basis. Top speed is 31 MPH on a lake. Mileage is great at 4 1/2 mpg. Weight of my rig with a full tank is right at 1400 lbs
1860 G3 80 HP OPTIMAX JET

archery68
Posts: 162
Joined: 14 Sep 2015, 21:02

Re: Merc 80 Jet Enough for my 1860??

Post by archery68 » 28 Aug 2019, 21:08

flex2win wrote:
archery68 wrote:
25 Aug 2019, 23:02
I’m not an expert. My opinion only. I think the 80 would work on your 1860. Depends of course how much gear your going to have, and also how many other people. I’m saying this only if it’s the factory jetted 80. The factory 80 jets are 115 hp motors but are 80 at the Jet/pump. That would be the biggest boat I would put it on. Most folks where I live run the the 80 jets on 1856’s. They perform really well, in fact that will be my next setup. The 2072 would be to big in my opinion. Would be sluggish, slow to get on plane. If you put a 90 prop on your boat and added the jet later that would drop the the hp to right at 65 hp at the jet. You lose that much with jet conversion. The 90/65 would not be enough motor for a 2072 and might not be enough for the 1860. I run the current river in Missouri. Lots of folks running the merc 115/80. Parts of current river has hp restrictions of 40hp so I run a 60/40 merc 4 stroke on an 1852 .80 gauge Blazer SS with a tiller. By myself 34 downstream and 31or so upstream. Put my family and our crap in there it drops big time. My point is I have to watch where I put all our stuff and distribute the weight. They just don’t run like props. Hope this has helped.


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Nope, your opinion matters. This is the kind of feedback I've been looking for to.
What kind of mileage(not that it is a deciding factor) are you seeing with your motor?

It sounds like I'm actually going to get to go with a guy that his this motor on his 18' Alweld
Sorry I do not know mileage. I used to run a two stroke years ago, it was a 40 but 28 at the jet. Speed wise probably not quite as fast as my 4 stroke 60/40. I would have 2 six gallon tanks with me in my old set up. It was a 2004 johnson. Would run where I do now and a lot of times would go through one tank and use part of the other. I can run the same now with the 4 stroke and use about 4 gallons or so. Much more quiet and powerful enough. My kids are getting bigger and with that friends come along. I want bigger motor to haul the weight. Not necessarily speed. I want the speed at the lake when fishing. My next setup will be a 1856 Blazer SS 100 gauge semi V with square front. Not sure yet on tiller or steering but it will be the 115/80. It should push that setup in the 40’s. Depending on weight of course. Would love to have a 150/105 but got to draw the line somewhere money wise.


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flex2win
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Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 28 Aug 2019, 22:17

RiverBottomOutdoors wrote:
27 Aug 2019, 00:45
80 at the pump or 80 at the engine? 65 at the pump is the absolute lowest I would go for a 1860 coming in around 700-900lb dry weight.

115 powerhead, 80hp at the pump.

flex2win
Posts: 13
Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 09 Sep 2019, 22:20

Had an opportunity to ride in a 1870 CC Weldbilt w the Merc 115/80 jet. I was kind of disappointed how long it took to plane out, took about 20-30yds. 24 gallons of fuel, 2 batteries in the back, not much in the front. That motor has been through hell, and I'm guessing there some wear in the impeller and the ring. Saw about 27mph. He's done ZERO maintenance to the motor, it's kind of sad actually.

I've decided to stay in the 1860 platform for the smaller river that i fish. The 80 and 65 jets are the same weight, I plan on moving batteries up front and possibly moving into a boat w a livewell. Can my transom handle the 378lbs vs the 250 that's on there now??

The 80hp is about $2500 more than the 65. Would the 65 be enough to power the boat or just go 80hp and be done? Tiller models, planning on the Big Tiller Handle.

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dhoganjr
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Location: Arcadia, MO

Re: Merc 80 Jet Enough for my 1860??

Post by dhoganjr » 11 Sep 2019, 19:15

I would go no less than a 115/80 and a 150/105 would be better for a 60" or bigger bottom.

A 115/80 will push it ok. If setup correctly, speeds should be around 34-36 on top end. It will do fine for 1 to 2 people if loaded light. It will struggle to get on plane as you have seen with more people and added weight. Weight distribution will be key. Should get around 5 mpg if you don't run wide open everywhere.

A 150/105 makes a big difference in weight carrying capacity and jumps on plane a lot better. It should run 35-40 depending on setup. It would give you plenty throttle to let off, so you don't have to keep it near wide open and get the same or better fuel mileage wise.

I have an 1860 flat bottom and ran a 115/80 four stroke on it for 11 years. It ran 36 with just me and a light load. I had a 24v trolling motor on the front with 2 batteries under front deck. Had to run a whaletail to keep the porpoiseing under control. Problems came with 3 to 4 people, felt like a football field to get on plane. The 250, which is around 175 at the pump makes an entirely different handling boat. Had I started with a 150 I would probably still have it on there, but the dealer I got it from said the 115 would do great. It was at first, but when it came time to take the family out, or really more than just me it was always a struggle. Always had to run till you could find a hole of water that was long enough to get a run at the riffle to get on plane.

Of course make sure your transom is designed to hold the extra weight. You will need 27" for a jet.
Dan
2003 1860 Alweld Flat Bottom
2014 Mercury 250 Pro XS Jet
2003 RiverCraft trailer
Retired from Riverlife-2002 Mercury 115 Fourstroke Jet

archery68
Posts: 162
Joined: 14 Sep 2015, 21:02

Re: Merc 80 Jet Enough for my 1860??

Post by archery68 » 11 Sep 2019, 22:16

I agree with dhoganjr. I have zero experience with an 1860 but the times I have discussed going larger than my 1852 with my dealer he has told me more than once to stay with an 1856 if the motor I’m going to get/afford is the 115/80. I do think his word for the 1860 with the 115/80 is SLUGGISH. He suggested no smaller than 150/105 on an 1860. They don’t give those things away!! Take all my info with a grain of salt, I have never owned the motors or boats you are asking about. Just going by what others have told me from their experiences.


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flex2win
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Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 14 Sep 2019, 21:40

Thank you for the responses. I did go meet w the dealer the other day, they will not hang anything bigger than what the boat is rated for(50hp)

jerseyjimk
Posts: 60
Joined: 06 Apr 2012, 16:22

Re: Merc 80 Jet Enough for my 1860??

Post by jerseyjimk » 15 Sep 2019, 07:21

I have a Crestliner 1860 that had a 60/40 on the back, top speed was around 23mph using a gps. Sold that motor, and I now have a 115/80 , I’ll Never go back to a 60/40, just the power alone is great to have.

flex2win
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Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 15 Sep 2019, 21:45

jerseyjimk wrote:
15 Sep 2019, 07:21
I have a Crestliner 1860 that had a 60/40 on the back, top speed was around 23mph using a gps. Sold that motor, and I now have a 115/80 , I’ll Never go back to a 60/40, just the power alone is great to have.

Tiller or console?? What are you seeing for top end out of it??

jerseyjimk
Posts: 60
Joined: 06 Apr 2012, 16:22

Re: Merc 80 Jet Enough for my 1860??

Post by jerseyjimk » 16 Sep 2019, 06:08

Center console and my top speed is 32 with 3 people, so far haven’t ran alone for fastest speed. Im not concerned about speed, just the power to move when I need it to

flex2win
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Joined: 30 Mar 2015, 22:59

Re: Merc 80 Jet Enough for my 1860??

Post by flex2win » 16 Sep 2019, 21:50

That's where I'm at as well, but it appears that even putting the 80 jet on my 1860 is going to be somewhat of a chore. It's going to need to go to a dealer first.

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