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Gear case sits just below or at the hull depth due to the deep v. s.setAttribute("rel", "stylesheet"); To break it down a bit more for you: Short shafts are 15-inches long. Allowing the propeller to pull water from underneath and push it out behind the boat. 7. Look at the part of your motor that would be <> }, 100); Depending on the manufacturer, size names might change. Some outboards have a serial number that tells you which shaft length to go for. Then adjust the motor in a higher hole with a flat head screwdriver. center of the propshaft. This was the height of my 225 Yamaha on my TR21 I show you how to consistently measure your prop to pad height. However, the motor should not be raised more than 5 inches above the standard position. Small portable outboards ranging from 2 to 20 horsepower are usually sold only in short or long shaft versions. If you go too short your more than likely going to cavitate and loose power. trimming the motor out by one-half to full trim. a Detwiler manual jackplate. Basically, there are three main ways to measure motor What is Transom Height? 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. Ask a friend to hold one end of a measuring tape at the extreme outer edge of the top of the transom while you pull the tape across its width to the opposite outer edge to measure the "length of the taffrail," which is the width of the boat across the top edge of the stern. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. If the height of the boat transom is off it can cause major issues. The height of the transom is estimated by using the center line to measure from the bottom of the hull to the top of the transom. There is a simple test to see if your outboard motor is set at the best height. maxAmount: 6500.0, Extra-long shafts are 25-inches long. })(); Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. Some may call it a standard length while others may call it a short or a long shaft. This cookie is set by GDPR Cookie Consent plugin. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. Gear Oil Quantity 195ml(6.6 Fl.oz.) This is measured by the propeller shaft being parallel to the vessels bottom. These are vertically aligned so the boater can make adjustments. With this in mind, how can I determine if my outboard has a short or long shaft? Ill also explain the difference between short and long shafts and how they vary by type of boat. 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. To measure your outboard motor shaft length, measure from the bottom of the mounting bracket where it rests on the transom to the top of the cavitation plate, this is the horizontal surface of the lower unit immediately above the propeller. 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. The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. I believe 20 to 21 inches is the optimum length for a lengthy shaft. If you have a fast boat, getting the outboards cavitation plate at the same level of the hull will ensure quick hole shot and fast top-end speeds. Will Charpentier is a writer who specializes in boating and maritime subjects. Propshaft in (127 mm). This will be the The center is the point where your outboard motor is (ideally) located. So its easier and safer to communicate with the dealer with the exact measurement of outboard shaft length in order to get the right model. Measure straight down to the lowest point on the hull. Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much. This restriction includes most fishing boats and longer sailboats. since 1986. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). I would ask you to go back and measure the transom of your boat. Higher mounting decisions should be left to the professionals. mpeInit(); To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. A hydrofoil will typically level off the ride by driving the stern up and the bow down, and will stop or considerably minimize porposing on a 16 footer with a mid-sized outboard and no tabs, for example. With it comes a lot of responsibility and new things to learn including, Why your boat transom needs to be the right height, The pros and cons of properly mounting the outboard motor to the transom, Standard mounting is always best for the beginner, Of course, its always best to go with standard practices when choosing the, Lower mounting is not for the beginning boater, Mounting the motor lower on the boat transom, There is a simple test to see if your outboard motor is set at the best height. With such an important, long-term, and expensive upgrade, its never a bad idea to double-check. This will ensure the best performance. A yardstick will help you determine if your outboard engine is at the right height. This measurement was approximately 4". Having the cavitation plate too low will cause excess drag and reduced performance at high speeds. Step 4. This could also affect your travelling capabilities on the boat trailer. Doing this can have adverse effects. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. In the case of a larger offshore boat, it may be to the top of a cutout on the . To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). However, your boat will have slightly more drag which will reduce your maximum speed. 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. As summer approaches there will be more boaters taking to the water. What Kind of Fuel Does Your Marine Engine Need? Triton. This measurement is primarily designed for single motor propulsion. 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. All rights reserved. It is where the outboard is mounted, and some boat owners place the name of the boat. out the confusion. Or it can have an angle degree as high as 30. On this type of boat, if you are in doubt, default to the longer-shafted outboard. endobj Engine Oil Type Genuine or Recommended 2str Engine Oil. Add yours in the comment and Ill get back to you asap. Higher mounting decisions should be left to the professionals. 12 Small Fishing Boat Accessories to Buy Today. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. Then test the boat and adjust the height, if necessary . If the height of the boat transom is off it can cause major issues. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. How do you measure a transom on an outboard motor? priceSelector: ".price--withoutTax, span.price.price--withTax", These cookies will be stored in your browser only with your consent. This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. You need JavaScript enabled to view it. want to measure from the transom to the flat part of this bracket, addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; #2. If it measures 15" or with in a inch of that you will need a short shaft outboard. They operate as a planing surface, allowing your boat to climb to the top more quickly. Step 3: Add another 10 cm (4'') to the previous calculation for the final ideal shaft length. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. gtag('js', new Date()); Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. Whats the best height for my boat motor? var xmlHttp = new XMLHttpRequest(); Check out the full chart of the Mercury outboard model code and its features. bassboat can be a bit confusing at times; hopefully this will help sort The standard installation of an outboard has the top of the transom of the boat at the same level as the bottom of the motor portion of the outboard. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. 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. 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. However, you will need an understanding of how the degrees will alter the boats usability. The dealer just hit you with the long or short shaft question and you have no clue as to what you need or even what he's talking about. The outboard comes with mounting holes and brackets. bracket. e-mail (function () { clearInterval(interval); This also means it can affect the safety of the boat. Brackets are also handy for boats that do not have flat transoms, like canoe-stern sailboats or fan-tailed motor vessels. on How to Measure Outboard Shaft Length: The Only Guide You Need, ePropulsion vs Torqeedo: An All-Round Comparison, 55 lb Thrust Trolling Motors: All You Need to Know Before Purchase, Spot Lock Trolling Motor: Is It Worth It & Best Options in 2022, Wiring 24V Trolling Motors: 24 Volt Wiring Diagram (with Video), LiFePO4 Battery: Why Lithium iron Phosphate Batteries Are Your Best Options in 2022, Minn Kota vs MotorGuide: Best Option in 2022. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. Or it can have an angle degree as high as 30. For really big boats, the biggest and baddest six- or eight-cylinder outboards can have extra-extra long shafts up to 30 inches. storeDisplayName: "Marine Parts Warehouse", You Measure from the top of the straight edge to the center of the front Why Rebounding Is A Key Skill for Fouth Players To Learn, Tips For Attacking a Zone Defense as a Youth Basketball Team, Why This is a Big Deal for the Sports Betting Industry. Lastly, knowing the year of your motor and what style of controls you have (side mount, concealed side mount, or binnacle) is also a plus because it will tell the dealer if your current controls are compatible with the motor you are purchasing. The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. In the photo above, we've measured from the motor bracket to the top of It also cuts into speed and fuel efficiency. s.setAttribute("type", "text/javascript"); Take the center measurement from the top to the bottom of the hull. Necessary cookies are absolutely essential for the website to function properly. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. To measure the transom height, measure from the center on for transom (rear of the boat). So in hopes that this will help out some new boaters this spring, here's a little rundown on outboard shaft sizes and how to figure out which one you actually need. and I'll explain it better, (or point you to someone that can help. At least if its too long you can raise the motor or "build up" your transom. Sailboats use these sometimes, as well as some boaters who want to install a much smaller auxiliary motor to use in case of primary engine failure. Copyright 1999-2023 Boats Group. Industry standards dictate that for short shaft engines the transom height should be 15. Analytical cookies are used to understand how visitors interact with the website. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. 4 0 obj Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. When trimming your motor, they provide you a greater bow response. While this is the case there is certain saltwater motors that are extra extra long at 30. Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. Among them will be first-timers or those who have recently purchased their boats. The shaft length for outboard motors has nothing to do with the water line. Thats it. Should I take the raft onto the water and measure the exact distance from the top of the transom to the water line? It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. I also love helping others, which is why I created this website. If you have a jackplate, you may have to get a bit creative in your function loadScript(script) { your motor will be higher.) For boats equipped with a bracket, calculate the same measurement but based on the bracket and not the transom. This measurement would be the inches of Follow Westshore Marine & Leisure on Wordpress! Use the mounting bracket on the motor to know where it will sit on the boat. Of course, its always best to go with standard practices when choosing thebest boat engine. It is where the outboard is mounted, and some boat owners place the name of the boat. The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. In lower mounting, the engine is set lower than the recommended standard. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); Youll also want to pay attention when youre in shallow water because your prop will be lower than normal. Take a long straight edge, (long carpenter's level or long }) } }); })(document); This alone can outweigh the negatives when deciding to adjust the mount upwards. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. loadScript(ptScript); As you can see, the measurement is about 2 1/2". Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. Read the following to get the optimal shaft length for outboard motors! 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. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. Buying a boat can be an exciting purchase. Then, you can pick the right engine. This is simply a measurement taken from the top of the transom (top of The current measurement is the ventilation plate is about 1 1/2" above the true keel line which is about 24" in front of the motor edge. When measuring the transom height, you should start from the hull's bottom at the boat's center line up to the top of the transom. Most of the standard engined boats it takes shafts that are 15-30inches long. Step 2: Three Variables to Consider Increased RPM and additional horsepower feed the need for speed. 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). var interval = setInterval(function () { Why wont Touch ID be under the screen in the iPhone 15 and iPhone 16? 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}'); Whether you already own a boat or looking for your first watercraft we are here to service your needs. Also, how do you determine the length of an outboard transom? One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. How to Buy a Boat: Tips for a First Time Buyer, Top 10 New Fishing Boats for Under $20,000, What Type is Right for You? debugMode: false, if (PayTomorrow) { The distance between the ends of a transom is measured in inches. of the "bullet" on your lower unit. Check the literature about your model boat online, and you may be surprised to find that the number is published for you. brackets. The average transom angle is around 14 degrees. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. What matters is the actual measurement in the specifications, not the name. (616) 364-0666, On all contiguous US part orders over $100. % var h = d.getElementsByTagName("head"), This email address is being protected from spambots. measuring; you may have to "extend" the flat part of the straight edge on the top of the transom to "extend" it out Take your time and understand your boat and your entire transom. 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. This exhaust port should be about 1 inch above the water line when the boat is idling.