How do you know if your outboard is too high?

Too high usually results in low water pressure, prop letting go in turns, or lack of bow lift are usually the telltale signs. Sometimes porpoising is caused by too much bow lift and dropping the motor will give it more bite and make it worse.

What happens if outboard is too high?

If it's too high, the propeller tends to ventilate, losing its bite on the water and blowing out while turning and in steep seas. “If the prop consistently ventilates when heading down a steep wave, the outboard is probably set too high,” says Dean Corbisier, advertising and public relations manager for Suzuki Marine.

How do you know if your outboard is mounted too low?

You can often tell that an outboard is too low if you are experiencing sluggish speeds, poor handling, excessive spray, porpoising, or even water pushing up into the cowling. That's a very brief, basic accounting of symptoms, but you'll usually find at least one of these symptoms if your motor is too low.

How high should my outboard be mounted?

Industry standards dictate that for short shaft engines the transom height should be 15″. A long shaft engine requires a height of 20″ and extra-long shaft engines will need a transom height of 25″.

How far should the prop be under the boat?

If you have a short shaft motor, the top most part of the transom and the lower most part of the boat should be about 15 to 16 inches. For a long shaft, I think 20 to 21 inches is correct.

How should an outboard sit on a boat?

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. As the prop moves further aft, it's also likely to be in cleaner, “harder” water, and be more efficient.

Should cavitation plate be underwater?

your cavitation plate should be right at the water level. As a rule of thumb it should be 1 inch above the hull for every 12 inches back. (if you have a eurotransom, or bracket or something.) If your cavitation plate is under water you might get better performance if you raise the motor.

How do I stop my boat from Porpoising?

Adjust Engine Trim Settings to Avoid Porpoising

Place the motor into forward gear and apply throttle until you reach cruising speed. Pay attention to your speedometer. Tilt the engine up with the trim switch. The altitude of the boat on the water should change, causing a slight rise to the bow.

Will a Jackplate help with Porpoising?

A jack plate does not help with porpoise, only somewhat makes it worse, but with the right prop and setup, it will work. Never had this issue with aluminum boats and motor and kicker mounted on transom, also most new glass boats now have stepped hulls, which is a jack plate in its self.

Where should my cavitation plate be?

The dealer set it at 1/2" above the bottom of the hull when the motor is sitting level or straight up and down. When the motor is trimmed all the way down it is 1/2" below the bottom of the boat but when trimmed up just a little there is slippage or some cavitation.

Is my boat motor high?

The symptoms of a motor too high are cavitating on the hole shot , otherwise if the boat has a good hole shot in my opinion you can't get the motor too high. Less motor in the water is less drag. Your boat is porpoising because it is running good and the hull is making and breaking suction with the water.

Will raising outboard increase RPM?

Will Raising My Outboard Increase Rpm? Every engine can be raised to maximize speed, rather than having too little pressure applied to the engine. With too much moisture in your room, the top speed will drop, but the top RPM will increase as it is exposed to more slip, with less ventilated room.

How deep should my prop be in the water?

Selecting The Proper Trolling Motor Shaft Length Is Critical

It will help ensure that the motors' shaft is long enough to keep the propeller submerged at least 12" below the water line in your specific fishing conditions.

Why does the front of my boat go up?

Porpoising, or the bow bobbing up and dow, is caused by over-trimming at cruising speed; there's no longer enough hull in the water to support the weight of the boat. Either trim down a little until the porpoising stops, or increase boat speed slightly to create more lifting force under the hull.

Will a hydrofoil stop Porpoising?

In addition to helping your boat get up on plane faster and more efficiently, an outboard motor hydrofoil or stern drive hydrofoil from Hydro-Shield can also help solve your porpoising problem.

Will a 4 blade prop stop Porpoising?

4 blade props tend to give you more transom "lift", as well as increasing holeshot (via the "rear lift"). It would help with the porpoising you are experiencing by lifting the back of the boat more.

What does Porpoising mean?

verb (used without object), por·poised, por·pois·ing. (of a speeding motorboat) to leap clear of the water after striking a wave. (of a torpedo) to appear above the surface of the water. to move forward with a rising and falling motion in the manner of a porpoise: The car has a tendency to porpoise when overloaded.

What is Porpoising when towing?

Porpoising is front to rear bounce; the front hits a bump, then the rear hits the bump, and they both bounce independently of each other, creating an oscillating motion. If the problem is severe enough, it can feel like you're going to pull the wheels off the ground.

How do I know if my boat is Cavitating?

Cavitation and Ventilation how can you tell the difference? If you can feel vibration and your propeller has visible pitting, you have cavitation and you probably need professional help. If, however, your engine is over-revving you have a ventilation issue and this is usually something you can fix yourself.

What is the purpose of a cavitation plate on an outboard motor?

Cavitation plates are mounted to the lower units of boats to help increase performance. They act as a planing surface to get your boat on top faster. They give you better bow response when trimming your motor. They keep water down at your prop and intake improving water pressure.

Why does my outboard cavitation?

Cavitation could be caused by badly placed transducer or through hull fitting. A hollow in the hull (also called a hook in the hull), worn/bent Propeller. From initial start – to get onto the plane, the engine seems to rev a lot but the boat stuggles to get up on the plane, you could have cavitation ventilation issues.

How do you find the transom angle?

Measuring The Transom Angle (Degrees):

Slide forward until the short side of the rule (16") touches the transom straight up. Measuure the distance from the keel point to the inside corner of carpenter's square ruler (see sketch). Each 1/4" is equal to 1° degree.

What is transom height?

The transom is the flat vertical section at the rear of the boat. It is where the outboard is mounted, and some boat owners place the name of the boat. The height of the transom is calculated by measuring from the bottom of the hull to the top of the transom, using the center line.

How deep should my trolling motor be in the water?

A trolling motor's ideal propeller should be at a depth that keeps about 6 inches of water above the blades. In other words, the centerline of the motor and the prop shaft should be about 12-18 inches below the waterline, depending on the make, model and dimensions of the trolling motor.