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Thread: First jet boat. First impressions.

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    Member BRWNBR's Avatar
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    Default First jet boat. First impressions.

    Got a hour or so on the meter today. 2072 alumacraft with canvas top/walkthru and a 150 merc with jet unit.
    34mph top speed at 12 gph
    I can see why guys add pods
    I can see why guys build in their splashwell
    I can see why guys have bilge pumps
    Iím sooo glad I got a bigger motor
    A jet does not know what ďhole shotĒ means
    I kept trying to adjust my jet height, but dang to low and water goes everywhere! I feel like itís to high but not much splashing, itís pumping water. So maybe itís good?
    Do jets cavitate all the time in a hard turn? More vibration that what I figured. I like how they turn, more like drifting a car than anything. Thatís different.
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    Moderator stid2677's Avatar
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    Remember you only have turning ability with power. If your boat does not have it,, adding a piece of plastic from the tunnel to over the jet foot knocks down stray spray.
    "I refuse to let the things I can't do stop me from doing the things I can"

  3. #3

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    Quote Originally Posted by BRWNBR View Post
    Got a hour or so on the meter today. 2072 alumacraft with canvas top/walkthru and a 150 merc with jet unit.
    34mph top speed at 12 gph
    I can see why guys add pods
    I can see why guys build in their splashwell
    I can see why guys have bilge pumps
    Iím sooo glad I got a bigger motor
    A jet does not know what ďhole shotĒ means
    I kept trying to adjust my jet height, but dang to low and water goes everywhere! I feel like itís to high but not much splashing, itís pumping water. So maybe itís good?
    Do jets cavitate all the time in a hard turn? More vibration that what I figured. I like how they turn, more like drifting a car than anything. Thatís different.
    Come take a spin in an Alwed to compare.

    Mel
    North River, Alweld and Phantom Boats, Mercury Marine, FNM Marine Diesel
    Hamilton, Kodiak, Almarine Jet
    Prop, Impeller repair, Planar Heater Sales & Installation
    Visit www.akfrontierfab.com

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    Member BRWNBR's Avatar
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    Quote Originally Posted by Halibutgrove View Post
    Come take a spin in an Alwed to compare.

    Mel
    Donít think thatís gonna do me any good. Maybe once I get dialed in with what I got it might help. But Iím still figuring out what a jet unit actually does and how itís most effective. Today was literally my first time pushing the throttle on a jet. Not sure whatís normal and whatís not or how to best adjust my motor. The boat hull itself it sweet, Iíve got zero problems with that so far.
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    Can't wait to hear about the first time you accidently put your new boat in a skid and wind up doing a 180 somewhere narrow like the channel between Lake Louise and Lake Susitna. Fun things to learn out there and some are pretty high up the oh **** meter... lol

  6. #6
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    Lol ya none of those moments yet!
    So How do I skid it anyway? She just turn into a rock skipping along the water if I bank it to quick or what?
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    Yeah, the quick turns can do it and in my case when I did that and scared the crap out of myself I was running really light. Flatter bottom boats have a slight tendency to skid a bit anyways and you will just need to learn how your boat reacts. Those are just things you will learn running your boat. Yours is heavier than what I have so that helps too.

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    Member Music Man's Avatar
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    It's like trying to teach someone to weld by just talking to them. It won't work, you have to experience it your self!
    When seconds count, the cops are just minutes away.
    '08 24' HCM Granite HD "River Dog"
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    Quote Originally Posted by Music Man View Post
    It's like trying to teach someone to weld by just talking to them. It won't work, you have to experience it your self!
    Ha for sure! But you can tell them some tricks to keep from getting set on fire!
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    Outboard jets do cavitate in hard turns. Fins on the intake help... some. Holeshot can be improved with weight distribution, move it forward. You should shoot for having the keel level and not stern heavy when at rest. Also look at the skew of the impeller. Last week I got a chance to switch from a regular "high skew" or high pitch 3 blade impeller and tried a 4 blade impeller with less pitch, and my holeshot really improved. Also overall weight affects holeshot too but even more so with a jet than a prop. Also keep an eye on the intake grate, sometimes even one rock or a stick will case cavitation and you have to pull over.

    Sobie2

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    Regular stock impeller on the left. 4 blade on the right. Noticed the difference in pitch (sometimes called skew for impellers).

    Sobie2


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    Great info thanks. Iím tail heavy big time right now. Gonna have some pods added me thinks.
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    I added pods to a seaark 1652 I had. They help a boat float level, but moving your cargo or people forward does the same thing. If you really want to benefit of pods mount them flush with the bottom of your hull to increase your running surface. I only say that because I have seen them mounted improperly before.

    I didnít add them to my 1860 seaark.

    Sobie2


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    Besides a stainless impeller, the clearance of the cone and impeller is very important, they say no more the 32/1000, that in my opinion is way to much I would say no more then 15/1000 less is even better, even filing off the leading edge of the grate makes a major improvement.

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    File off the leading edge? Do you mean like sharpening your grate?
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    Quote Originally Posted by BRWNBR View Post
    File off the leading edge? Do you mean like sharpening your grate?
    Yes like a chisel, the flat grates cause aeration and will lower performance.

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    Makes sense...
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    Quote Originally Posted by BRWNBR View Post
    Makes sense...
    Here is some good information about jet units, I hope this helps.


    http://leeroysramblings.com/outboard...aintenance.htm

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    Quote Originally Posted by hunter1951 View Post
    Yes like a chisel, the flat grates cause aeration and will lower performance.
    Use a little caution here, what you gain in performance you may loose in hassle. Rounded or sharpened intake grates will improve water flow and reduce aeration, however it will also allow for more ingestion of gravel. If you are prone to running shallow in gravel bottom rivers you will be spending more time picking out stones from your grate. If the river is deep or silt bottom then its probably not a big deal. There is no stomp grate, you will be picking out the rocks with a screw driver.

  20. #20

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    Which jet did they sell you. 7 5/8 or 7 3/8. Makes a difference on hole shot and load carrying capacity? Both are options on the 150 with the 7
    5/8 reported to provide better hole shot and load carrying capacity.
    North River, Alweld and Phantom Boats, Mercury Marine, FNM Marine Diesel
    Hamilton, Kodiak, Almarine Jet
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