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Jet Boats
General Jet Boat Discussions
Some questions about outboard jet hull sizes
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<blockquote data-quote="dhoganjr" data-source="post: 418049" data-attributes="member: 12925"><p>150/105 should push it fine, that is the bare minimum I would get with a 60" bottom and up. That will be a heavy boat so you will need the extra grunt of a 150. Mine is an 03' 1860 Alweld .100 guage, I had it built with 3 transom knee braces and it was and still is a stout boat. I first started with a 115/80 and it would run about 36 with just me in it. Start to add weight and gear and it struggled to get on plane and you had to stay in the throttle. I then jumped to the 250/175 Pro XS and it was an entirely different boat. Topped out at 51 and I could run 35 at about 4000 rpms, it would get about 5 mpg average if I stayed out of the throttle which was the same as the 115 because it had to work harder. </p><p></p><p>Jet hp is easily figured by multiplying head hp x .7 so a 200 would be 200x0.7=140 so it would be a 200/140 Just in case you didn't know why I was putting 115/80 or 250/175 on here. Jets lose about 30% of the hp in the pump so that is an easy way to figure it.</p><p></p><p>You can find used pumps, might have to do some searching though. They are specific to model and year ranges, new they run $2000+. If you are going to try and find a used pump make sure the engine you get is a popular one so you have a better chance of finding one.</p><p></p><p>If I can get them to post I'll have some videos up later on the Outboard Jet link to show you what they are capable of. It will also show you what can happen, it is the day I totaled the boat.</p></blockquote><p></p>
[QUOTE="dhoganjr, post: 418049, member: 12925"] 150/105 should push it fine, that is the bare minimum I would get with a 60" bottom and up. That will be a heavy boat so you will need the extra grunt of a 150. Mine is an 03' 1860 Alweld .100 guage, I had it built with 3 transom knee braces and it was and still is a stout boat. I first started with a 115/80 and it would run about 36 with just me in it. Start to add weight and gear and it struggled to get on plane and you had to stay in the throttle. I then jumped to the 250/175 Pro XS and it was an entirely different boat. Topped out at 51 and I could run 35 at about 4000 rpms, it would get about 5 mpg average if I stayed out of the throttle which was the same as the 115 because it had to work harder. Jet hp is easily figured by multiplying head hp x .7 so a 200 would be 200x0.7=140 so it would be a 200/140 Just in case you didn't know why I was putting 115/80 or 250/175 on here. Jets lose about 30% of the hp in the pump so that is an easy way to figure it. You can find used pumps, might have to do some searching though. They are specific to model and year ranges, new they run $2000+. If you are going to try and find a used pump make sure the engine you get is a popular one so you have a better chance of finding one. If I can get them to post I'll have some videos up later on the Outboard Jet link to show you what they are capable of. It will also show you what can happen, it is the day I totaled the boat. [/QUOTE]
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Some questions about outboard jet hull sizes
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