Anti ventilation plate outboard motor

Also when getting out of the hole the motor needs to be trimmed all the way down then trimmed out. At cruise the A-V plate should ride just at the surface or slightly above the surface on normal boats.

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Above keel line Set engine at center of boat.

Anti ventilation plate outboard motor. The length of an outboard is measured from the top of the clamp bracket to the anti-ventilation plate and motors are offered in four different lengths. S short 15 inches L long 20 inches XL 25 inches and XXL 30 inches. Here we are seeking pictures of the position of the anti-ventilation plate on the outboard when the boat is running on plane.

Feel free to contribute any pictures or to comment about the position of the anti-ventilation plate relative to the water flow as shown in any of the pictures seen or linked above–jimh Jeff. Compression plates are intended for use on outboards that are set up to run with the anti-ventilation plate above the bottom of the hull. Compression plates are designed to keep water in contact with the propeller tips and prevent blowout.

Especially useful on tunnel hulls to channel flow from the tunnel to the prop. Anti ventilation plate too high. It looks like you are way too high.

With the AV plate level with the keel it should be 1-2 inches above the keel. Also when getting out of the hole the motor needs to be trimmed all the way down then trimmed out. The farther out the harder to steer and more air.

Gee The plate in question is an anti-ventilation plate. It is designed to help stop air from being drawn into the prop. At cruise the A-V plate should ride just at the surface or slightly above the surface on normal boats.

Hi performance boats may want it to ride higher but then could have ventilation issues. The ventilation problem is my fault as I raised the engine 2inches as I could not get on a plane at all - Im now going to put it back but this will put the anti-ventilation plates 2 inches below the hull bottom. Im just hoping that the rather coarse trim adjustment on the motor will be OK at max position.

I wish I had power trim and more power. The anti-ventilation plate should ride on the surface or slightly above the surface when the boat is on a fast plane. The height can only be determined by testing as the setback of the motor also comes into play.

There is no hard and fast rule. The relation of the propshaft to the bottom of the boat is not important in a not for racing boat. The condition continues until the prop slows enough for the air bubbles to rise to the surfaceThe primary causes of ventilation are.

Motor mounted too high motor trimmed out excessively damage to the anti-ventilation plate damage to propeller. A cavitation plate is a permanent horizontal plate on the vertical shaft of the outboard right above the propeller. It sits just at the water level when the boat is up on plane ie.

Flush with the bottom of the boat for a planing style hull. The correct name for this plate is an Anti-ventilation plate to preventreduce. The condition continues until the prop slows enough for the air bubbles to rise to the surfaceThe primary causes of ventilation are.

Motor mounted too high motor trimmed out excessively damage to the anti-ventilation plate damage to propeller. A second anti-ventilation plate 38 is mounted to the housing and extends rearwardly and downwardly at an angle relative to horizontal. Anti-ventilation plate 38 is a semi-rigid sheet-like member and has a forward end 40 fixedly mounted to the underside of plate 32 on housing 12 by right and left bolts one of which is shown at 42.

Anti Ventilation Plate 30-50mm 12-2 Position. Above keel line Set engine at center of boat. Transom matching Be sure that the anti ventilation plate of the outboard motor is below the water surface when running with the throttle wide open.

If the above condition cannot be met due to the shape of the bottom of your. Typically the outboards length is calculated by measuring the distance between the anti-ventilation plate and the clamp brackets upper edge. The outboard length is alternatively referred to as the motor shaft length.

Commonly we see outboard lengths divided into four categories. These are the S L XL and XXL categories. Position of the Anti-Ventilation Plate.

When the boat is trimmed down completely the bottom of the anti-ventilation plate is supposed to be roughly 1 above the keel per foot distance to the transom. Consistent Ventilation of the Prop. 1 Be sure that the anti ventilation plate of the outboard motor is 30-50mm 12-2 in below the water surface.

If the above condition cannot be met due to the shape of the bottom of your boat please consult your authorized dealer. Bottom of hull Anti Ventilation Plate 30-50 mm 12-2 in 2 To attach the outboard motor to the. Most outboard and stern-drive engines have anti-ventilation plates made onto the lower unit housing directly above the propeller.

Many people mistakenly call them cavitation plates or possibly. A propeller shaft 16 driven by an engine not illustrated is positioned under the anti-ventilation plate 14 to carry a propeller not illustrated for driving the outboard motor through the water. The engine is cooled by water taken in through a water inlet 18 provided on the lower side of the anti-ventilation plate 14.

If the above condition cannot be met due to the shape of the bottom of your. Ive been looking a boat that has a broken anti-ventilation plate about 13 of one side is off and the big washer is bent. Ive gotten an estimate for a messy weld repair of 700 and a replacement cost of 1400 parts labor for a new gear housing.

This is on a 1995 Maxum 1800 SR MerCruiser 43LXV6 Alpha One with power steering. An outboard motor is a motor that provides propulsion and steering control for boats. The parts of an outboard motor include the engine gearbox propeller or jet drive skeg or lower unit water intake anti-ventilation plate mounting bracket and tiller.

In one form the splash guard is substantially U-shaped and is mounted between the anti-ventilation plate and spray plate of an outboard motor exteriorly of the outer surface of the gearcase. In another form the splash guard includes an integral tail section and is mounted by being sandwiched between the gearcase and drive shaft housing. This flat plate anode fits into the anti-ventilation plate trim tab anode cavity on MercuryMariner 35 hp 300 hp outboards Force 90 and 100 hp outboards 1995 and newer MerCruiser Alpha One Gen II Drives Bravo I II III X XR and XZ Drives.

Provides additional clearance for high rake propellers. Inspect annually and easy to replace. Anti-ventilation plate is parallel to the boat bottom.

If the board transom angle is less than 8 the BF200A or BF225A anti-ventilation plate will not be parallel to the boat bottom when trimmed to the lowest hole. ANTI-VENT11 Dual outboard motors must be installed so that the outboard motor center-to-center distance is a minimum of 660 mm 26.