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General Jet Boat Discussions
Jet jon cavitation issues
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<blockquote data-quote="PSG-1" data-source="post: 318036" data-attributes="member: 6937"><p>Bingo! This is probably a large part of the issue with cavitation.</p><p></p><p></p><p>BTW, here's a picture of a top-loader grate:</p><p></p><p>[ATTACH=full]53567[/ATTACH]</p><p></p><p>Notice how it has the scoop toward the rear edge like a conventional grate? But it also has that blade farther toward the front. This blade is pitched at a slightly different angle, and it feeds water to the "top" of the pump (the upper radius) which keeps it from sucking air and cavitating. Also, it only has 2 longitudinal tines, which eliminates some of the air pockets that would be created with a multi-tine grate.</p><p></p><p>Only drawback of the top-loader is that it becomes a vacuum cleaner, and that's not a good thing if you plan on operating in a lot of grass and other debris. Due to the areas I operate in, I had to decide whether I wanted to eliminate cavitation, or be able to keep weeds out of my pump, and I decided to go back to a factory grate, then modified it to be a swing-down "stomp grate" for easy cleaning of weeds.</p><p></p><p>In your case, I still think the strake may be the culprit. Especially if there's 2 of them!</p></blockquote><p></p>
[QUOTE="PSG-1, post: 318036, member: 6937"] Bingo! This is probably a large part of the issue with cavitation. BTW, here's a picture of a top-loader grate: [ATTACH type="full" alt="images.jpeg"]53567._xfImport[/ATTACH] Notice how it has the scoop toward the rear edge like a conventional grate? But it also has that blade farther toward the front. This blade is pitched at a slightly different angle, and it feeds water to the "top" of the pump (the upper radius) which keeps it from sucking air and cavitating. Also, it only has 2 longitudinal tines, which eliminates some of the air pockets that would be created with a multi-tine grate. Only drawback of the top-loader is that it becomes a vacuum cleaner, and that's not a good thing if you plan on operating in a lot of grass and other debris. Due to the areas I operate in, I had to decide whether I wanted to eliminate cavitation, or be able to keep weeds out of my pump, and I decided to go back to a factory grate, then modified it to be a swing-down "stomp grate" for easy cleaning of weeds. In your case, I still think the strake may be the culprit. Especially if there's 2 of them! [/QUOTE]
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