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GPS top speed w 2 people, fully loaded fuel,beer etc is 70 mph on nitrous. i have the motor set so the anti cavitation plate is about half an inch higher than the keel of the boat. Page 1 of 2 - Another C180 with cavitation problems - posted in 180 Challenger: Bought a new 2010 C180 SE 255hp. The trick is to choose a boat propeller that delivers acceptable acceleration and top speed. Running a dominator pump, droop, inducer, ride plate, diverter, set back pump, and sbc. They say they sell bunches of these units every year with no apparent problem. A boat rigger’s rule of thumb is that the motor can be raised one inch for each eight to 10 inches of distance between the transom and prop. You need cavitation planing off if you want good top speed, if the boat's not too heavy and sluggish for the motor: jack the motor up until the cavitation plate's at least 1/2" above the bottom of the boat, and cup the prop. Most common cause is the motor in mounted to high or motor trimed too far out. In water-jet installations on big boats (in sizes up to thousands of horsepower), the intake tunnels are very carefully designed as smooth S-bends, bringing water in from below the hull, turning it slightly upward to raise it to the height of the pump, then turning it horizontal again to enter the impeller squarely. Took the boat back this season, they claimed that the wear ring is worn beyond spec. Also common in turns. ... that cavitates above 3200 rpm. What boat? I have stick steer. Engine is already all the way down on transom and trimmed all the way. If the strut is too high the prop will have problems grabbing water, one of the usual suspects. I have a 15' aluminum hull w/ delta pad bottom. Ran out of summer and had to store the boat. Any recommendations on a different prop. I have a Yamaha 150 for power, which is mounted to the transom in the middle of the three mounting positions. The boat was equipped by the marina in the same way that all of their pontoons are equipped. When I turn right it is way easy. Had bad cavitation, took it back and the ride plate wasnt sealed. Cavitation is a phenomenon in which the static pressure of the liquid reduces to below the liquid's vapour pressure, leading to the formation of small vapor-filled cavities in the liquid.When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock waves that may damage machinery. Hamilton 212 steering. I've noticed the boat cavitates in moderate to heavy turns at 3/4 to full throttle and the rpm's increase. If the motor cavitates at top speed then either the prop's not cupped enough, or the motor's too high. Having a problem with your boat this is a good place to ask. It has a brand new 3 blade prop. As the prop moves further aft, it’s also likely to be in cleaner, “harder” water, and be more efficient. A qualified dealer or marina can help with selection, but you need to be prepared with some vital information. You will need to know the type of engine and its horsepower rating, the boat's weight and hull style, and the type of propeller you are running now: number of blades, diameter and pitch. Got the boat back and it was better but still had the problem. When I make the boat go left it has a lot of resistance and doesn't turn as sharp. Turns a C impellor 5400, about 5900 on nitrous. Tue Nov 26, 2013 2:08 am. Try hand launching the boat, don't just set it in the water and hit the throttle but a slight under-hand toss level with the water will have the boat already moving when it hits the water. Of course the prop looses bite on the water and it can cause the motor to over rev while the boat slows down. Boat is a 16 foot tri haul, with a 1976 75hp johnson. Cavitation is when the prop starts turning in air.

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