Measuring Motor Height - BassBoat Central LOYALHEARTDY Outboard Motor 6 HP 2-Stroke Inflatable Fishing Boat Well, raising the outboard motor can be an easy task for you. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. endobj Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. Or it can have an angle degree as high as 30. Boost Speed with Outboard Engine Height Adjustments The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. These two measurements will give you the length of the shaft you need. If you said something smaller than that, thats where it can get tricky. s.setAttribute("type", "text/javascript"); For over five years he has worked as a newspaper reporter and historic researcher. (Any measurement given as "off the transom" Look at the part of your motor that would be It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. In addition, motor totes will not harm the finish of the lower unit. Some boats are equipped with transom-hung outboards while others have a bracket. Industry standards dictate that for short shaft engines the transom height should be 15. If you are running a twin-engine setup, then measure the same distance from each clamping plate to the bottom of the hull. Motor height on pontoon? | Boating Forum - iboats Boating Forums How high exactly do you have to raise the transom?-. storeDisplayName: "Marine Parts Warehouse", On most newer center consoles and offshoreboat transoms might include a rear door leading to a swim platform as well as a molded setback bracket. Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. Proper Mounting Height for an Outboard - Gone Outdoors Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. Place the clubs bottom on the ground as though it were going to be used to strike a golf ball. This restriction includes most fishing boats and longer sailboats. WHAT LENGTH OUTBOARD DO YOU REALLY NEED? - Van's Sport Center The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. from the transom. This is the dimension you'll need when selecting a width for your outboard motor's mounting bracket. What is a Transom Saver And Do I Need One? - Boat Safe It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. Tightening Torque for Engine. manufacturer will recommend the outboard height according to the bracket shape and length. 2 0 obj ensure that your measurement is accurate. Before we get started lets see what a boat transom is and what it does. This is the dimension you'll need to know when deciding between a short shaft, long shaft or extra long shaft for your outboard motor. function gtag(){dataLayer.push(arguments);} As a result, the issue is whether my boat need a short shaft or long shaft motor. Which Navigation Lights Does Your Boat Need? Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. To measure the transom height, measure from the center on for transom (rear of the boat). Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. How Low Should a Motor Set on a Pontoon Boat? (Explained) (function (d) { Safely but briskly accelerate. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. When fighting waves from the stern, a 20-inch transom is considerably safer. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. Its important to note that manufacturers call their models different things. Necessary cookies are absolutely essential for the website to function properly. Other boats that need short shafts are: A: If you have a small boat with a 18 to 21 inch aft transom, youll most likely need a long shaft outboard. Of course, its always best to go with standard practices when choosing thebest boat engine. <> jackplate to a point level with the top of the transom. The average transom angle is around 14 degrees. of the "bullet" on your lower unit. With a motor tote, the outboard and boat move as one, independently of the trailer, so there are no concerns about the boat shifting on the trailer, he says. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. With the long side (22 1/2), place a carpenters square ) in opposition to the keel. Setting Height of Outboard Motor - YouTube 0:00 / 0:46 Setting Height of Outboard Motor nates90 71 subscribers Subscribe 83 Share 63K views 7 years ago #boatservice #outboardmotor. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. According to MarinePartsMan.com, the outboard can be raised 1 inch above the standard height for every 10 miles per hour of speed the boat can attain. gtag('config', 'G-QX0Y76NH40'); Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. Cavitation plates are used on the bottom components of boats to help them operate better. The distance between the ends of a transom is measured in inches. Measure from the top of the transom to the bottom of the hull. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. All rights reserved. This allows the engine to idle without the flow of the exhaust being restricted. former editor at Boating Magazine and contributor to many national publications Step 2 requires the propeller's radius (check the user manual and then the technical drawing). These cookies ensure basic functionalities and security features of the website, anonymously. up to the bottom of the motor brackets, (as in #1). The form of a boats transom varies depending on the manufacturer and model. You also might not be able to lift the outboard out of the water entirely for storage. The transom is the flat vertical section at the rear of the boat. function loadScript(script) { What Is a Transom? Where Onboard a Boat is It Located? This transom saver will support the weight of your outboard throughout your road travel, steadily bracing it against the trailer frame to relieve your transom of the weight and impact from consistent bouncing. stream The height is approximately six inches higher than with a propeller. Other boats that need extra long shafts are: Read my other articles on outboard motors. Place the bracket on the transom to the left of the main outboard or rudder. Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. want to measure from the transom to the flat part of this bracket, You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. disregard the "hooks" at the front of the To achieve this, the motor itself has to be attached at the correct height. var xmlHttp = new XMLHttpRequest(); Take your time and understand your boat and your entire transom. No one wants to have issues with a new transom or boat repairs. Increased RPM and additional horsepower feed the need for speed. Check out some hot FAQs to help you get the proper outboard shaft lengths. I believe 20 to 21 inches is the optimum length for a lengthy shaft. Use the mounting bracket on the motor to know where it will sit on the boat. actually have the propshaft above the pad.). To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. (In the case of the faster Measure from the top of the transom to the bottom of the hull. Some fishing boats can handle the motor being underwater. What is the Virtual Sundance Film Festival? What Types of Documents Can be Sent to your Kindle Library? (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. <> Take the center measurement from the top to the bottom of the hull. The engine must be linked to the transom at the proper height for a propeller to best meet specific boating demands. Rest the yard stick or another suitable straight edge along the keel on the bottom of the boat so that it makes a straight line aft to the outboard. Beginning boaters should be aware of the boats measurements. The average transom angle is around 14 degrees. If we run into that scenario, I would still show you the different options of motors and go over pricing, but I would also ask you to hold off and do one thing before you pull the trigger. If the height of the boat transom is off it can cause major issues. if (PayTomorrow) { The boat transom can be flat with zero degree angles. Remanufactured 4 Cylinder 4-Stroke Cylinder Heads, Remanufactured 6 Cylinder 4-Stroke Cylinder Heads, Trim Relays, Trim Solenoids & Sending Units, Remanufactured V6 & V8 4-Stroke Cylinder Heads, Volvo Cobra SX Bearings and Bearing Carriers, Volvo Cobra SX Driveshaft, U-Joints & Parts, Volvo Cobra SX Transom Assembly & Bellows. Buying a boat can be an exciting purchase. You need JavaScript enabled to view it. They keep water out of your prop and increase water pressure in the system. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. Here we will guide you in how to get the right boat transom height. What types of boat need an extra long shaft? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. If the height of the boat transom is off it can cause major issues. This could also affect your travelling capabilities on the boat trailer. But opting out of some of these cookies may affect your browsing experience. Later in the article is an image that shows you exactly where to measure. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. So how to determine the outboard shaft length? At least if its too long you can raise the motor or "build up" your transom. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); Keith Allen, a 1979 graduate of Valley City State College, has worked at a variety of jobs including computer operator, medical clinic manager, radio talk show host and potato sorter. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. There are also specialty motor shaft lengths. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. The first order of business is to measure your boat for the ideal fit. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. var h = d.getElementsByTagName("head"), You reply, "Im not sure, I think its a long". Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated I also love helping others, which is why I created this website. As a dealer I don't really like hearing this because there is a chance it could go either way and you have to get it right. Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. var addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@'; The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. Usually speaking, the farther the outboard is set off the transom, the higher the propeller should be in the water (or the higher the outboard can be mounted). (Putting a var prefix = 'ma' + 'il' + 'to'; Actual shaft length is 21.5" on those. The flat part of the bracket that rests on the transom when mounted will give you the same point of reference as the transom does on the boat. publicId: "32bf3437d1346295e03ebcf545f9c839", A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Anything bigger than that your obviously going to need an extra long shaft. These are vertically aligned so the boater can make adjustments. var addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@' + 'vanssports' + '.' + 'com';document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML += ''+addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5+'<\/a>'; height (that I'm aware of); probably the most common is: It can also improve the experience of driving a faster boat. How to Find Your Shaft Length | ePropulsion Typical motor lengths include the following. All rights reserved. There are instances where a lower mount may be okay. This alone can outweigh the negatives when deciding to adjust the mount upwards. There is a simple test to see if your outboard motor is set at the best height. This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ loadScript(ptScript); Having the cavitation plate too low will cause excess drag and reduced performance at high speeds. Selecting the Correct Size Outboard Shaft, What is the Best Outboard Motor for Saltwater, Diagnosing Common Outboard Motor Problems, Best Beginner Boats Everything You Need to Know. The cookies is used to store the user consent for the cookies in the category "Necessary". The Effects of Standard, Lower and Higher Mounting. Many single-engine boats mount a smaller auxiliary motor for emergency use. A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. Always weigh the risks of making adjustments. %PDF-1.7 primeApr: 12.99, Engine height with stepped hull at transom - before I screw things up No one wants to have issues with a new transom or boat repairs. If you are running a slower boat, the exact location of the ventilation plate is less important. However, the motor should not be raised more than 5 inches above the standard position. Smaller 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. In the case of a larger offshore boat, it may be to the top of a cutout on the .
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