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Step 4. This is the dimension you'll need when selecting a width for your outboard motor's mounting bracket. All you need to do is measure how much to rise. Mounting the motor lower on the boat transomcan createexcessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. Measure from the top of the transom to the bottom of the hull. I would ask you to go back and measure the transom of your boat. displayMicroOffers: false, This measurement is primarily designed for single motor propulsion. primeApr: 12.99, However, the motor should not be raised more than 5 inches above the standard position. This is simply a measurement taken from the top of the transom (top of You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. Again, make sure that you are measuring to the flat part of the brackets; Measure from the top of the straight edge to the center of the front One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Like Westshore Marine & Leisure on Facebook! 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. For slower boats, its less critical to. 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. 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). If it measures between 17 and 22, you'll want to go with a long shaft motor. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. There are a series of four to six holes at the top of the bracket, and the lower bolts actually fit into slots. In the second photo, we've measure down from the top of the Detwiler You must be still in the blue about that matter. steel ruler, etc. Be sure to measure carefully and research thoroughly before diving in. 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. It can also improve the experience of driving a faster boat. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub endobj Raising an outboard higher on the transom can reduce drag and raise top speed. Your email address will not be published. disregard the downward pointing "hooks" at the front of the How to Measure Outboard Shaft Length: The Only Guide You Need Wherever the outboard clamping bracket is, use this as the basis for measurement. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. So if you are measuring the outboard shaft length for the powerboat, planing boat, or any boat for which the speed is the priority, take the outboard shaft length 1 to 1.5 (depending on your boat types) shorter than standard would be better. This cookie is set by GDPR Cookie Consent plugin. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. This exhaust port should be about 1 inch above the water line when the boat is idling. loadScript(ptScript); It also cuts into speed and fuel efficiency. Check out some hot FAQs to help you get the proper outboard shaft lengths. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. (function (d) { Motor height on pontoon? | Boating Forum - iboats Boating Forums 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. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. Some outboards have a serial number that tells you which shaft length to go for. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Buying a boat can be an exciting purchase. #3. Basically, there are three main ways to measure motor height (that I'm aware of); probably the most common is: # 1: Height of the motor off the transom This is simply a measurement taken from the top of the transom (top of the aluminum plate on top of the transom), to the bottom of the motor "brackets". Then adjust the motor in a higher hole with a flat head screwdriver. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. Each one has a totally different effect on the boats performance. Necessary cookies are absolutely essential for the website to function properly. Remember, if you use a longer outboard shaft than you need you will be increasing your draft. It also includes attaching the right engine. } In addition, motor totes will not harm the finish of the lower unit. The cookie is used to store the user consent for the cookies in the category "Other. Industry standards dictate that for short shaft engines the transom height should be 15. PayTomorrow.mpeInit({ Boost Speed with Outboard Engine Height Adjustments To measure the transom height, measure from the center on for transom (rear of the boat). A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Engine Oil Type Genuine or Recommended 2str Engine Oil. var path = 'hr' + 'ef' + '='; The average transom angle is around 14 degrees. The Best Way to Measure Prop to Pad | How to measure Outboard Motor Height Disclaimer: As an affiliate I may earn a commission on any qualifying purchases, including those from Amazon.com, at no extra cost to you read more. 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. However, you will need an understanding of how the degrees will alter the boats usability. Increased RPM and additional horsepower feed the need for speed. actually have the propshaft above the pad.). How-To: Pick A Great Portable Outboard Motor (2023 Guide) The faster your boat, the more critical it is to get the sizing just right. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Some fishing boats can handle the motor being underwater. The boater must also consider if the boat transomsupport is designed to bear the weight of a higher mount. Recommended Engine Oil 2-Stroke Outboard Motor Oil. When the boat transom is too low, the motor could end up underwater. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. In the case of a larger offshore boat, it may be to the top of a cutout on the . High powered boats usually only come in long and extra-long variants. addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; Step 2 requires the propeller's radius (check the user manual and then the technical drawing). Other factors to consider when determining the mounting height of an outboard are related to performance. However, your boat will have slightly more drag which will reduce your maximum speed. How to Measure Shaft Length on Outboard Motor? - TrollinMotorsGuide ), and place it on the bottom of the pad in the center. It also cuts into speed and fuel efficiency. % Thats a fairly simple list of symptoms, but if your motor is too low, youll probably notice at least one of them. Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. As summer approaches there will be more boaters taking to the water. 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. Many boat transoms are modified to use a different length of outboard by using a bracket. Kicker Motor Shaft Length - This Old Boat - Lake Ontario United - Lake Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. While this is the case there is certain saltwater motors that are extra extra long at 30. Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); (Putting a How can you figure out what your transom angle is? This cookie is set by GDPR Cookie Consent plugin. (3) Move horizontally across the chart until you hit the graph curve. 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. As with anything, there are exceptions to the rule. Also, how do you determine the length of an outboard transom? This website uses cookies to improve your experience while you navigate through the website. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. The propellers will also have trouble reaching the water. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. August 9/08). If you are running a slower boat, the exact location of the ventilation plate is less important. Because of the increased friction, cavitation reduces efficiency. The form of a boats transom varies depending on the manufacturer and model. Take your time and understand your boat and your entire transom. enableMoreInfoLink: true, maxAmount: 6500.0, 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. Hold the tape on the top, center of the taffrail and measure straight down to the point, usually a sharp angle, where the transom joins the bottom of the boat. Outboard shaft length plays a crucial role in the performance of your boat. "brackets". The transom is the flat vertical section at the rear of the boat. Mounting kicker motor - General Discussion Forum | In-Depth Outdoors This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. Whether you already own a boat or looking for your first watercraft we are here to service your needs. Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. Boats that use longer outboard shafts include: By clicking Accept, you consent to the use of ALL the cookies. If your boat is newer and the manufacturer is still in business, you might also want to try to give them a call. relation to pad This will keep the prop in the water when the boat pitches in waves, or hobby-horses. The propellers will also have trouble reaching the water. A: The short answer is Yes. 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. WHAT LENGTH OUTBOARD DO YOU REALLY NEED? - Van's Sport Center To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. the aluminum plate on top of the transom), to the bottom of the motor This would not be a good thing. An outboard motor can drive just about any sort of boat with proper mounting. A deep Vee hull will result in a different measurement than a flatter . 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. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. 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. h[0].appendChild(s); The transom in a boat today is a place to hang your outboard motor. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats.