If you have an outboard motor, the distance from one end to another will be found on the side or on a label near its bottom. This provides seaworthiness and offers maximum protection from large seas. Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. I also love helping others, which is why I created this website. Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated Actual shaft length is 21.5" on those. So you should just measure the height of the boat's transom from the center down to the lowest point of the hull, and compare transom height with the outboard shaft length numbers. Other boats that need long shafts are. It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. var addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@' + 'vanssports' + '.' + 'com';document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML += ''+addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5+'<\/a>'; Basically, there are three main ways to measure motor If you have a question or need additional information. 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. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); This cookie is set by GDPR Cookie Consent plugin. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) However, the motor should not be raised more than 5 inches above the standard position. If it measures 15" or with in a inch of that you will need a short shaft outboard. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. The pressure behind your hand dropped as you slid your hand back and forth through the water. How to Measure Shaft Length on Outboard Motor? - TrollinMotorsGuide As a dealer I run into this situation from time to time, which is fine but getting the right length outboard for your boat is crucial. }) } }); })(document); If the propeller fails to ventilate, the motor is mounted to low. This is probably the worst case scenario out of the two. Save my name, email, and website in this browser for the next time I comment. xmlHttp.send('{"store_id":"369079","timezone_offset":"-5","timestamp":"2023-03-04T05:39:31.71020200Z","visit_id":"e2642be3-34e5-4a48-b89d-639d139834e0","channel_id":1}'); and I'll explain it better, (or point you to someone that can help. Follow Westshore Marine & Leisure on Twitter! It will ensure that the outboards trim will be effective, and it will save you gas too. Once you know what will fit on your hull, you can fine-tune your choice based on the performance youre looking for and how you use the boat. your motor will be higher.) addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; There are instances where a lower mount may be okay. var h = d.getElementsByTagName("head"), The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. Upstream Securitys Disruptive Telematics Technology, The challenges of scaling a cloud-based security system, OneStreams unified platform streamlines financial data management, OneStreams impact on the financial software market. The faster your boat, the more critical it is to get the sizing just right. jackplate to a point level with the top of the transom. Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. Increased RPM and additional horsepower feed the need for speed. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. x\[D~OUCO6[j](l%ay <8cylY{.L2s#]~U6A|Wj]-oo|mubqY6wbY_|!>Z8(RB:RHeTzOGO_=~t\ Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. Boaters who consider going with a higher mount can see increased speeds. There Place the point of a yardstick at the middle of the top of the boat transom. Theyre also useful if the back of your boat has a non-standard measurement. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Long shafts are 20-inches long. Some outboards have a serial number that tells you which shaft length to go for. There is a simple test to see if your outboard motor is set at the best height. If the propeller fails to ventilate, the motor is mounted to low. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. This, however, is not recommended for the beginning boater. You can find your Mercury outboard model code on an ID plate or sticker. Check out the Westshore Marine & Leisure Youtube page! Here are several situations on how you should adjust the outboard shaft length: Mounting the outboard a little bit higher than the standard point could reduce drag, improve RPM at full throttle, and therefore improve speed and make it easier for the boat to get on plane. The center is the point where your outboard motor is (ideally) located. 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. However, youll notice a little increase in drag and a decrease in top-end performance. Set the end of the tape on the outside edge of the taffrail at the center and measure inward to the inside edge of the taffrail. There are also specialty motor shaft lengths. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. s.setAttribute("type", "text/javascript"); To do so, take a measurement from the very top to the very bottom of the transom in the precise center. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. These cookies ensure basic functionalities and security features of the website, anonymously. maxTerm: 36, The outboard shaft length is the vertical distance between the top of the mounting clamp bracket and the bottom of the cavitation plate (aka the ventilation plate). Yamaha Outboard Motors: How To Measure Leg Length Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. It is where the outboard is mounted, and some boat owners place the name of the boat. will be to the flat part; if you measure to the bottom of the brackets s = d.createElement("script"); It can also improve the experience of driving a faster boat. clearInterval(interval); MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. The propellers will also have trouble reaching the water. However, you will need an understanding of how the degrees will alter the boats usability. All boats are different, and the motor manufacturers produce a variety of standard lengths. What matters is the actual measurement in the specifications, not the name. Before we get started lets see what a boat transom is and what it does. However, you will need an understanding of how the degrees will alter the boats usability. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. In the case of a larger offshore boat, it may be to the top of a cutout on the . Mounting the outboard motor in accordance with the industry standards is important. How to Find Your Shaft Length | ePropulsion Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. Remember, if you use a longer outboard shaft than you need you will be increasing your draft. h[0].appendChild(s); The transom is the rear wall of the boat where the outboard engine is mounted in the middle. Depending on the manufacturer, size names might change. function loadScript(script) { It also decreases the boats lift and increases the time it takes for the boat to reach plane. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. (Putting a I mean it is better to be safe than sorry, am I right? Workboats, sailboats, and displacement-hulled boats fall into this category. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. Industry standards dictate that for short shaft engines the transom height should be 15. 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. The transom is the boats flat vertical part at the back. 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. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. Or it can have an angle degree as high as 30. Add yours in the comment and Ill get back to you asap. Two years ago, I bought a Boston Whaler to fish off the coast. For slower boats, its less critical to. You also have the option to opt-out of these cookies. If you said you have a pontoon or a larger style boat such as a bass boat or speed boat, I would be pretty confident in saying it needs a long shaft. You reply, "Im not sure, I think its a long". Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. help with shaft length for a kicker - iboats Boating Forums If the height of the boat transom is off it can cause major issues. In extremes, the engine can have overheating problems if the boat is raised to a point where the water inlets for the cooling system are out of the water. This will ensure the best performance. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. Before we get started lets see what a boat transom is and what it does. The brackets can add 1 inch to the overall mounting height of the outboard. bassboat can be a bit confusing at times; hopefully this will help sort hulls, such as Allisons, Bullets, Strokers, etc., this measurement could The greater the number, the more the drive may sway (also called tuck under or negative trim). Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? function mpeInit() { So if you are measuring the outboard shaft length for smaller boats, inflatables, dinghies, sailboat or other low-speed work boats, the cavitation plate is often about 2 below the bottom. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. Using your existing control box and gauges will save you quite a bit of money in the end. Thats it. So how to measure outboard shaft length? Thats a fairly simple list of symptoms, but if your motor is too low, youll probably notice at least one of them. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. The outboard comes with mounting holes and brackets. A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. 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. This will keep the prop in the water when the boat pitches in waves, or hobby-horses. The transom angle is the vertical incline of the transom and is measured in degrees. 2019s List of the Best Recreational Pontoon Boats for Sale. not sure that it's still used. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. Since the ventilation plate & foil are burried under water it is obviously too low. Like Westshore Marine & Leisure on Facebook! They keep water out of your prop and increase water pressure in the system. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. When you measure the width of the stern, mark the center with a grease pencil. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. No one wants to have issues with a new transom or boat repairs. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. As summer approaches there will be more boaters taking to the water. You can use a longer shaft than recommended and your boat will work fine. In addition, motor totes will not harm the finish of the lower unit. With such an important, long-term, and expensive upgrade, its never a bad idea to double-check. How high exactly do you have to raise the transom?-. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Most of the standard engined boats it takes shafts that are 15-30inches long. Read the measurement on the transoms bottom. How-To: Pick A Great Portable Outboard Motor (2023 Guide) Then adjust the motor in a higher hole with a flat head screwdriver. The anti-cavitation plate above the prop needs to be within an inch of the bottom of the transom, therefore, the prop should be well below the transom. <> 2 0 obj Another important measurement is the transom angle. 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. And the rule of thumb is that you should keep the cavitation plate level with the bottom or keel of the boat. I hope this helps someone out in their search for a new or newer outboard this season. 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). Each one has a totally different effect on the boats performance. Next, measure from your centerline to where the outboard will be mounted on each side. What's the best height for my boat motor? Engine Oil Type Genuine or Recommended 2str Engine Oil. In lower mounting, the engine is set lower than the recommended standard. 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