SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: pipes on January 22, 2014, 07:01:47 PM
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Ok I admit this might be a dumb question but you guys seem like the people to ask.
I have a 77 Kona with I believe1/4 stringers 460 with about 375 hp. I'm going to pull the engine do a little work to it and get 500 hp. The boat speed now is around 60mph. Has a Berkeley with manual place diverter, not sure what bowl
Questions. .
What speeds and horsepower can this boat handle?
Should I and or can I use a engine rail kit with 1/4 stringers?
Is this boat worth it or should I look for something with full stringers
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Bump
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You can use a rail kit with 1/4 stringers. If you like the boat keep it. You can always convert it to full stringers later if you wanted.
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Do I need a rail kit with 500 horsepower?
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And why would I need full stringers?
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Racing rules require them, otherwise it usually makes the boat ride better and feel safer.
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And why would I need full stringers?
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Best answer I can muster...
A jet pump, speaking Berkeley type pump (which would include the Dominator, American Turbine, Legend, Bayjet, Jacuzzi etc.) basically only drives the hull by being glued (for lack of better terminology) to the hull at the keel.
All the horsepower generated from the engine gets transferred to the pump (which is rigidly mounted to the hull) via the stringers, this power technically has to be transferred with the engine wanting to torque over while being bolted to wood that is simply glassed to the hull.
With a quarter stringer hull, I like to compare the construction to a car that is a Uni-Body, there is no frame. In stark comparison, the full stringer hull would be compared to a full frame car.
It has to do with structural integrity, safety and performance.
I disagree with the ride quality comment though, if your quarter stringer boat rides worse than a full stringer hull, I would go buy a box of Sawzall blades and make some flower boxes out of it, it definitely should not be used as a boat... :sly:
The rail kit has three "major" benefits.
The first is that there are many more areas of contact with a rail kit than compared to a standard four point set up this makes it incredibly strong.
The second is the engine can be removed and installed in a fraction of the time compared to a four point and this allows you to leave all the string bolts in place and not disturbing the wood more than you have to.
The third is, they simply look badass and have endless adjust-ability, but once dialed in, becomes plug and play...... 8)
Hope this helps.
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Thank you! You guys really are helpful. I guess I have to make some decisions .as with all boats[break out another thousand] do I spend the money or not. I could easily dump 5 grand into it and still have a boat that's worth what I paid for it. I see some pretty sweet rides for 6-10 grand. Problem is they're all out by you guys. Here in upstate new york it's slim picking for that style boat.
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What's the market for jet boats where your at ?
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I paid $5000 for mine and that was a really good deal. I think I only saw about 6 for sale here all summer long. One guy had a Carlson for sale for 4500 dollars and wouldn't budge. Total POS you guys would list the trailer for sale with a free boat
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