TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Jet Boats
General Jet Boat Discussions
Yamaha Jet pump all-stainless wear ring assembly
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="PSG-1" data-source="post: 392069" data-attributes="member: 6937"><p>The AAT cone does seem to make a difference in hole shot, and on top end. It uses a spring-loaded shuttlecock that moves back and forth, dependent on water flow through the pump. At low flows, the shuttlecock is retracted, allowing full water volume to flow through.</p><p></p><p>At speed, water flows through a small inlet in the cone, which causes the shuttlecock to move rearward, causing a very slight constriction of the amount of water flowing through the thrust nozzle, which increases top end by about 1-2 MPH. This constriction also helps keep the pump loaded with water a little better than with an OEM cone, which helps with hook-up in choppy water.</p><p></p><p>I ran my boat the other day to test out the new impeller and wear ring. Got up to 39 MPH at around 8500 RPM, but couldn't go any more on the throttle due to porpoising. If I had a passenger in the front, it wouldn't do that. But I need to make some kind of adjustment to my ride plate so the porpoising isn't an issue. Also found that my thru-hull bearing for the driveshaft has a slight leak..... :x :x :x Not enough to sink the boat, but enough that I wouldn't leave it docked in the water overnight. At some point I have to deal with that, too...and removing that bearing is a real SOB.</p></blockquote><p></p>
[QUOTE="PSG-1, post: 392069, member: 6937"] The AAT cone does seem to make a difference in hole shot, and on top end. It uses a spring-loaded shuttlecock that moves back and forth, dependent on water flow through the pump. At low flows, the shuttlecock is retracted, allowing full water volume to flow through. At speed, water flows through a small inlet in the cone, which causes the shuttlecock to move rearward, causing a very slight constriction of the amount of water flowing through the thrust nozzle, which increases top end by about 1-2 MPH. This constriction also helps keep the pump loaded with water a little better than with an OEM cone, which helps with hook-up in choppy water. I ran my boat the other day to test out the new impeller and wear ring. Got up to 39 MPH at around 8500 RPM, but couldn't go any more on the throttle due to porpoising. If I had a passenger in the front, it wouldn't do that. But I need to make some kind of adjustment to my ride plate so the porpoising isn't an issue. Also found that my thru-hull bearing for the driveshaft has a slight leak..... :x :x :x Not enough to sink the boat, but enough that I wouldn't leave it docked in the water overnight. At some point I have to deal with that, too...and removing that bearing is a real SOB. [/QUOTE]
Verification
Post reply
Forums
Jet Boats
General Jet Boat Discussions
Yamaha Jet pump all-stainless wear ring assembly
Top