Just picked up another jet sprint boat

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JL8Jeff
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Just picked up another jet sprint boat

Post by JL8Jeff »

It's a 1993 Jetcraft and I got it without a motor or jet drive but I already have a ZZ3 motor being prepped in the garage and a Hamilton 772 jet drive waiting to be shipped.

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2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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handyandy
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Just picked up another jet sprint boat

Post by handyandy »

awesome looks like a fun toy I'd like one but I already have to many gas guzzling toys to work on keep us posted on the build

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JL8Jeff
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Location: Ewing, NJ

Just picked up another jet sprint boat

Post by JL8Jeff »

It's already turning into a lot of little work. The ZZ3 motor I bought was set up with a TPI setup so I had to remove all of that and I've been buying the stuff to go back to carb. All the marine based stuff for a sbc is not cheap and not easy to find so I've been picking off what I can find slowly.
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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Stumpalump
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Just picked up another jet sprint boat

Post by Stumpalump »

Your going to have a blast. Hang in there with the build.
1991 18' Valco Bayrunner Evenrude 48 SPL

Arizona

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handyandy
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Just picked up another jet sprint boat

Post by handyandy »

to much trouble to run the TPI?

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Stumpalump
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Just picked up another jet sprint boat

Post by Stumpalump »

handyandy wrote:to much trouble to run the TPI?
Gotta ditch the O2 sensor on a wet exhaust. Best way to do that and keep fuel injection is with a Mercruser (Mefi) controller. I run a Chevy LSJ 2.0 supercharged motor out of a Cobalt SS on race gas in a sand car. The race gas is leaded so I can't run an O2 sensor either except for when it's on a dyno. Solution is to use a Mercruiser (mefi) controller and custom wire harness. Problem with that is its not as easy as stripping an old boat. Best is to call an outfit like CBM and buy it and harness with a tune in the computer to start with. Chucking on a simple carb is a heck of a lot less time and money plus you don't have to pay for dyno time or risk blowing it up.
1991 18' Valco Bayrunner Evenrude 48 SPL

Arizona

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JL8Jeff
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Joined: 26 Oct 2013, 14:56
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Location: Ewing, NJ

Just picked up another jet sprint boat

Post by JL8Jeff »

handyandy wrote:to much trouble to run the TPI?
I really don't like the idea of running high fuel pressure in a boat that will be bouncing around like this. I've actually sold/traded the TPI setup for some other parts already so I'm slowly making progress.
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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handyandy
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Just picked up another jet sprint boat

Post by handyandy »

https://www.duckhuntingchat.com/forum/v ... 2&t=845386

This guy made a homemade block for his o2 sensors that seems to have worked. I know it's a completely different fuel injection set up and engine. But would think a similar thing could be done with most 02 sensors. Just food for thought really I can understand why your going the route you are cool boat would be a blast.

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JL8Jeff
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Just picked up another jet sprint boat

Post by JL8Jeff »

Finally got the boat running but I'm waiting on the muffler inserts for the headers. I ran it on the trailer with open headers at the boat ramp and it's a little loud! :mrgreen:

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2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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crazymanme2
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Just picked up another jet sprint boat

Post by crazymanme2 »

How much you have in a play toy like that if you don't mind me asking. #-o

Are you going to race it? =D>
Craig
Be Who You Are
And Say What You Feel
Because Those That Mind ....Don't Matter
And Those Who Matter....Don't Mind

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Stumpalump
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Just picked up another jet sprint boat

Post by Stumpalump »

I love watching those things race.
1991 18' Valco Bayrunner Evenrude 48 SPL

Arizona

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JL8Jeff
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Joined: 26 Oct 2013, 14:56
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Location: Ewing, NJ

Just picked up another jet sprint boat

Post by JL8Jeff »

crazymanme2 wrote:How much you have in a play toy like that if you don't mind me asking. #-o

Are you going to race it? =D>
I wanted a motor with aluminum heads for the weight savings so that was some extra cost.

No, not planning to race it, just something to run around with. I've had a few really fun boats and the sprint boat is one of them.
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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JL8Jeff
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Joined: 26 Oct 2013, 14:56
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Location: Ewing, NJ

Just picked up another jet sprint boat

Post by JL8Jeff »

The headers were just too loud even with muffler inserts and they also put out too much heat which circulated back on top of you so I found a set of EMI Thunder center riser manifolds and it's much quieter and cooler now. Some pics of the manifolds/risers.

And a short video of a run that is a little out of focus so it doesn't give a good perspective, but it sounds good. I fought with a bad carb for almost 2 months before giving up and getting a new one.

https://www.facebook.com/jeff.hansbury. ... 226093680/

I think the video was private but I updated it to make it public now.
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2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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JL8Jeff
Posts: 898
Joined: 26 Oct 2013, 14:56
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Location: Ewing, NJ

Just picked up another jet sprint boat

Post by JL8Jeff »

I swapped out impellers to run more pitch and it has definitely brought the rpm's down which is nice. Last year I ran 19 and 22 pitch impellers and this year I'm trying 22 and 27 pitch. I took the boat out this past Saturday and it cruised at least 3-500 rpm's lower on plane so that should save on some gas as well. It's hard to tell if there is a difference in the top end, you have to be really focused on what's going on in the water ahead of you.
2001 Lowe Roughneck 1652 VT with Merc 60/45 jet 2 stroke

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Bateman
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Just picked up another jet sprint boat

Post by Bateman »

Nice work!

Pretty random to see this pop up today. I have been drooling over these especially hard for the last week. I'm looking more at the kits that utilize jet ski engines, although an LS3 would be sweeeet!

I have given up the hobby of rock crawling/jeeping and I guess I just don't feel complete without some hobby that burns large amounts of money. :lol: I'm pretty sure a mini jet boat would fill that void and still get me to the remote areas where I like spending my weekends.