Hi all,
Long time lurker and immensely thankful to all the help I've gotten from you folks, even though I'm all the way up in sunny Ontario, Canada! I finally, *finally* got my boat finished and in the water and my god am I in love. Full details below for those that are curious on the engine / hull / pump. I cruise at ~15% throttle or 3k RPM to hit ~35, and so far my highest speed is 60 mph (on GPS) at less than half throttle, low 4000s RPM. Wooo!!! There's only two things stopping me from really pushing it. The first is I stupidly left the ride plate off my pump...and it definitely wants / needs it for stability. The trim / place diverter is so incredibly sensitive right now it's almost laughable...the nozzle is 3' back from the transom and there's nothing for the boat to ride on to balance it. The other thing that's worrying me are a few noises I'm not a huge fan of, that I'm hoping you guys can help me with! Engine is fresh off the dyno (~30 min break in to seat the rings plus a few pulls), pump is "brand new" after sitting for about 6 years, freshly greased with Valvoline front and rear.
Noises:- Noise #1 - Clunking at idle. I've read both on here, and in the American Turbine manual, that this is common at idle when the pump hasn't had a chance to load the impeller. My bowl only sits ~3/4 into the water so I'm hoping this is the case? But if someone can confirm, that would settle my nerves.
- Noise #2 - an incessant whine. Once on plane and at cruise speeds or higher, there's a whine. It's directly tied to engine / pump speed. It's not aggressive, or angry, or even that loud...but man it gets on your nerves after a while. It sort of sounds like a blower, but quieter, and more muted...and my build is N/A. Any ideas on what this could be, or how to stop it?
- Noise #3 - a more metallic sound that only comes on higher up in the RPM range, when accelerating. If I give some throttle, say to get from 3700-4000, you hear it. Then if I let off just the slightest touch to drop to 3950...it's gone. No idea what it could be, and a bit concerned given the metallic nature of it. It's not a grinding or a scraping...sort of hard to describe...but definitely more metallic than the whine.
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Any help would be MUCH appreciated...and I've done my best to include pics. Video coming soon, hopefully
Thanks!!!
Hull:Modified Glen-L rampage that's longer, wider, and taller than stock. Built with a combination of mahagony and white ash / sitka spruce / white cedar. Hull weight without engine, rigging, etc is ~900 lbs. I estimate ~2000 "wet" and ready to go. The deck is a deeply stained mahagony as well, even though it looks sort of black in the photos.
PumpAmerican Turbine SD-309, AA impeller, performance intake (shoe, ride plate that's not yet installed), and the newest version of their trim system. I also added a custom trim gauge that I made using 3D printing and a bike brake cable...it works really well, and I'm happy to share details / files if members are curious.
Engine492 chevy (40 over instead of 30), Scat forged crank and rods, icon forged flat top pistons, AFR 265 heads, a custom hardin / comp cam (226 / .591 intake, 234 / .601 exhaust, 112 LSA, installed 4 degrees retarded), Vic Jr intake, and a Sniper EFI system which I am *LOVING* and also happy to share all of my details on. Exhaust is a Hardin seaward system, water jacketed with the mix point occurring ~2 ft after the manifolds. Thermostatic water (10 AN lines, 4 port thermostat @ 160 degrees) and thermostatic oil (2x16" tube cooler, remote filter, 10 AN lines...running 20W-50 break in but will likely switch to straight 40 or a 5/10/15W-40 as pressures are a titch high with the 20W-50).
If I forgot any pertinent details, don't hesitate to ask!
