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mosquito airboats mantis 61
- Thread starter brlcLA
- Start date
br,lc,LA
Similar to what Cold-Eh posted, a mechanic told me, “Pull the heads off the Briggs, machine .02 " off each head. Remove the carb, rejet it with a .01 larger jet. Remove the intake, use a dremel tool to open the jagged edges inside the intake to let air/fuel flow smoother. Remove the existing exhaust, put larger pipes and muffler on it. Bingo, you have more horsepower. It is really not a hard thing to gain a few more HP out of a small motor. Making fuel flow IN and OUT of the engine will increase the HP of any engine. The cool thing is by doing so will also extend the life of the engine."
In reference to increasing the 35 HP B&S to the Mantis 61 HP B&S, on page 4, post 2, of the mini-airboat thread cntry141iq states,�You know it seems to me that there is a little more than "tweaking" being done when you double the horsepower. I have heard the twin turbo boat featured in airboat world has already expired after 150 hours. I mentioned this to a guy who knows nothing of airboats and his response was well how long did they think it would run ... 150 hours was longer than I would have expected it to last. When you push the envelope reliability/longevity is often the sacrifice made. There is a price to be paid for everything, nothing comes free and doubling the hp on an engine common sense says you may be pushing the edge a little.
The confusing part for me is the first paragraph mentions an increase in the engine life and the second paragraph mentions a decrease in the engine life. Is the engine life increased or decreased?
Warranty, of course, is always an issue. If you modify a 35 HP B&S to a 61 HP B&S then what are the ramifications for warranty purposes?
Supposedly, B&S is coming out with a 45 HP model this year.
Similar to what Cold-Eh posted, a mechanic told me, “Pull the heads off the Briggs, machine .02 " off each head. Remove the carb, rejet it with a .01 larger jet. Remove the intake, use a dremel tool to open the jagged edges inside the intake to let air/fuel flow smoother. Remove the existing exhaust, put larger pipes and muffler on it. Bingo, you have more horsepower. It is really not a hard thing to gain a few more HP out of a small motor. Making fuel flow IN and OUT of the engine will increase the HP of any engine. The cool thing is by doing so will also extend the life of the engine."
In reference to increasing the 35 HP B&S to the Mantis 61 HP B&S, on page 4, post 2, of the mini-airboat thread cntry141iq states,�You know it seems to me that there is a little more than "tweaking" being done when you double the horsepower. I have heard the twin turbo boat featured in airboat world has already expired after 150 hours. I mentioned this to a guy who knows nothing of airboats and his response was well how long did they think it would run ... 150 hours was longer than I would have expected it to last. When you push the envelope reliability/longevity is often the sacrifice made. There is a price to be paid for everything, nothing comes free and doubling the hp on an engine common sense says you may be pushing the edge a little.
The confusing part for me is the first paragraph mentions an increase in the engine life and the second paragraph mentions a decrease in the engine life. Is the engine life increased or decreased?
Warranty, of course, is always an issue. If you modify a 35 HP B&S to a 61 HP B&S then what are the ramifications for warranty purposes?
Supposedly, B&S is coming out with a 45 HP model this year.
A
Anonymous
Guest
Joboy, did they go to a diaphram carb on the 61 hp engine?
Ken
Ken
the heads have been shaved ,,it has a new roller cam and roller rockers ,,billet rods ,,forged high compreshion pestons ,,completely restroked crank,,and more they wont tell me about .these engines will turn 6500 rpms but they set them up to turn 5000 rpms.i gess they have some seckrets .
A
Anonymous
Guest
Forgive my manners, Joboy. Welcome to the forum.
There a lot of folks on here who will be real interested in what you can tell them about your boat.
Nice to have you ...
BF
There a lot of folks on here who will be real interested in what you can tell them about your boat.
Nice to have you ...
BF
i dont no that much about airboats and this is my first boat ,i have road in the larger ones but i could never spend $30,000 on a boat i would be in the dog house for sure .i got this boat at a good deal .they ask me if i would run it hard if i got it and of course i said no ,but after i said that they said i have to dog it if i wonted to get a good deal in it .they told me if it blows they will fix it for me, so what can i say . i gess thats one way to extend the testing of the engine . and so for i have had no trouble with it .well no i did have one small problem the 2end time i had it out ,the gass line was leeking but 5 minits with a screwdriver and im good to go.
joboy.
Welcome to Southern Airboats joboy. My knowledge of airboats is limited as well. I am anxious to find out more about your mini-airboat. Please share with us some information about your mini-airboat.
What else can you tell us about your 61 HP mini-airboat?
What are the pros/cons for your mini-airboat?
What is the speed vs. payload for your mini-airboat?
How long have you had your mini-airboat?
Welcome aboard,
tf
Welcome to Southern Airboats joboy. My knowledge of airboats is limited as well. I am anxious to find out more about your mini-airboat. Please share with us some information about your mini-airboat.
What else can you tell us about your 61 HP mini-airboat?
What are the pros/cons for your mini-airboat?
What is the speed vs. payload for your mini-airboat?
How long have you had your mini-airboat?
Welcome aboard,
tf
Cold –Eh,
Hold on there, Mr. Impatient. I asked my question first so get in line and wait your turn. :wink:
By the way, how are you coming along with your mini-boat? Are you going to post pictures to this forum so we can see it being built in progress? When is your anticipated date of completion? Keep us informed as you push ahead.
tf
Hold on there, Mr. Impatient. I asked my question first so get in line and wait your turn. :wink:
By the way, how are you coming along with your mini-boat? Are you going to post pictures to this forum so we can see it being built in progress? When is your anticipated date of completion? Keep us informed as you push ahead.
tf
Sorry for budding in there. I had just finished unpacking our band gear from a New Years eave gig we played and needed to unwind, so a couple beers and checked out the forum. I'm going to pick up my hull tomorrow! My wife wants a little more progress with the renovations but as long as she sees an effort I think I can steal some time for myself. If everything goes well I would like to have it going by spring, much easier target now that I don't have to build a hull. I have a feeling it wont be the last boat I build! I'll get some pictures on here soon!
i gess the pros, would be cheep to run ,,ezy to pull down the road,,and if it does get stuck you can move it by hand ,,tf":2424ahvq said:joboy.
Welcome to Southern Airboats joboy. My knowledge of airboats is limited as well. I am anxious to find out more about your mini-airboat. Please share with us some information about your mini-airboat.
What else can you tell us about your 61 HP mini-airboat?
What are the pros/cons for your mini-airboat?
What is the speed vs. payload for your mini-airboat?
How long have you had your mini-airboat?
Welcome aboard,
tf
cons,you cant hall 5 people in it you cant run 75 mph ,,i gess thats all the cons i can think of .
i way around 190 and my boat will run in the lower 40s if you hold it ,but the bets avg speed is around 30 it seems to handel good at that speed and as far as runing dry ground with just me in it it will do most any thing i need ,if i add another person some times on dry ground i have to ask the other person to get out or help nugg it ,but if i hit the ground moveing it will go on most of the time .
i got my boat this past july it has 347 hrs on it now .
my hull is a 10x6 with 1/4 inch polymerCOLD-EH'":3bh1mcul said:Even before we get all that information, What is your hull width and length? Just trying to figure what I can expect!
yes i just delevered one to a man this week ,i gess they will sale you any pat of it you wont .Are they selling the motor only??? Would love to get my hands on that one if it holds up.