How Long Is A Short Shaft Outboard

July 8, 2024, 2:58 pm

Now, how does one identify which engine a particular boat is. If the OB is mounted off centre, heel in the wrong direction could deprive you of drive, just when you really don't want that to happen. MotoBoat wrote:Here is more info on trasom length vs correct outboard shaft length... " onclick="();return false; I have the option of trying out the motor on my boat on a local lake which I plan on doing this weekend. As for 25hp look on the data plate on your hull for a "Max HP". 🔑 Key Takeaways: 1️⃣ The optimal shaft length of the outboard motor is determined by measuring the required height of the transom and then matching this with the most suitable model. Is fairly easy with OMC (Johnson, Evinrude, and Gale) engines, as. Is set-up for a long shaft or short shaft engine. Joined: 03 Sep 2015, 17:10. NB: all outboard motors exist with short shafts and long shafts. Small inflatable boats. Please study the diagram to familiarize yourself with engine and boat terms. If you bottom out by mistake or your boat runs aground, check out this guide on what to do when your boat runs aground. Easy to use with new tilt system. Depends what boat it is and if it's in a well or on the transom.

Long Shaft To Short Shaft Outboard Conversion

Most outboard motors that are short shaft are 17 inches from the secure point on the outboard to the bottom of the shaft. Just measure the distance between the motor mount and the water surface. This is the distance from the propellor hub's center to the blade's edge. Too much shaft length in the water, creates drag when moving at speeds above idle. Engine: Suzuki DT75? Although my Yamaha 130 is autolube we also premix 100:1 (as advised by my Yamaha service provider) to give extra protection so this fuel is also OK for the auxillary. Sponsored by Life Proof Boats. In the late 80's, with the increased popularity of deep-V offshore. This number will likely be shorter than that for a single-engine installation since you do not necessarily measure to the point of the keel. The main difference between a long-shaft outboard motor and a short-shaft motor outboard is the length of the shaft. How the outboard will sit on the back of the boat depends on how the transom is designed. To ensure that the propellor is in free water and not shielded by the boat's hull, and add an additional 4 inches (10cm) to the shaft length. Not necessarily, mine is short shaft cos when I originally bought a long shaft it was too long and trailed in the water.

Long shaft outboard boats are designed for bigger engines to propel heavier boats. I have an Oday 20 with a short shaft 7. To decide whether a short or long shaft engine outboard is needed, you need three measurements. OMC recommended transom and splashwell dimensions. This article discusses the difference between long and short-shaft outboard motors and the effects of the wrong shaft being installed.

Outboard Motors Long Shaft Vs Short Shaft

If you go too short, that's the worst scenario as you're more than likely going to cavitate. Highly reliable thanks to a first in class oil filter. For example, a Yamaha 25hp 4-stroke weighs about 170 Evinrude 25hp E-tec weighs in at 166 poundsboth are 20" units with electric start. Those v4 Yamahas as superb engines and mine ran for 14 years without problems. Taka Tigga: Takacat 3. If it's about 10 inches longer than the short shaft's 20 inches, it's an extra-long shaft. It depends on the boat.

But is getting the outboard shaft height essential? Of course, if the short one doesn't reach below the transom, it won't do a lot of good, so you're stuck with a long. But your talking about the equivalence of 25 full size horses strapped together and hell bent to get to the opposite side of the lake. The strength of the water flow. Kfedka wrote:Have a 14ft aluminum boat with a transom of 17 inches. Also with propeller ventilation (air getting into the prop, causing. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. IMHO relying on oil injection on any high hours engine is a lottery, and splashing some oil in the fuel is cheap insurance.

Length Of Short Shaft Outboard

It is always easier (with regards to kit availability) to convert a short shaft to a long rather than a long to a short. My boat the motor seems to cavitate or come out of the water often, do I. have the incorrect shaft length? Which should be perfect for a long shaft. Why Having the Right Shaft Outboard Length Is Important. Boats that use longer outboard shafts include: - Larger sailboats. The lowest point will likely be directly under your drain plug if you've got one.
Re: does it make difference to use long shaft or short shaft.

Short Shaft Vs Long Shaft Outboard Motors

Long shaft boat motor: 51cm transom height. But since you're probably in deep shit already by losing the main engine with the QM2 bearing down on you, you rather want to be able to start the little begger and give it some ASAP. When you start getting into the 25hp range, the screw clamps are really just for try. Ideally the cavitation plate should line up with the bottom of the transom. If you know what your doing you can safely mod the boat to suit your purposes.

5" above the transom bottom, while it should be flush or 1. Outboard: Tohatsu 9. Gas-powered motors have the following components installed in the shaft and lower unit. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. This dimension will be about 16 or. But it's my understanding the 4 strokes are much heavier for the horsepower. Join Date: Jul 2003. For instance a standard shaft is around 17" so on a 15" transom you're 2" too long to begin with.

Besides, it's not like I'm buying a boat now in January anyway.. One thing that crossed my mind with that particular 18" Y-stern and 16. This isn't really true motor manufacturers have all gotten a lot of weight out of their respected 4-strokes. Well I killed that one good and proper didn't I. Also, local characteristics may affect those percentages; geographic areas. 2 cm) in some boats. However, why struggle to measure transom height or guess the ideal outboard shaft length when you can check the boat's manual? Yard stick will only touch the top of the transom, not the bottom.

This is handy if you're shopping for second-hand outboards or looking to sell the one that came with your boat. Location: Bracknell, Berkshire. Gear Shift: F-N-R. - Exhaust: Above Prop Exhaust. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. The draught is the measurement between the waterline on the boat's hull and the bottom of the hull.

Boat name: April Lass. You may not want to do this if you are operating in shallow water. We had a 4hp Suzuki on our Trimaran and it was quite dependable. Measure The Transom Length. Complication; the "height' of the transom is the vertical measurement. A Shaft Which Is Too Short May Contact The Boat. Be sure to measure carefully and research thoroughly before diving in. For vee-shaped hulls, the lowest spot of the hull will come to point, while on flat-bottomed boats it will be more or less level. No need to have an extra 5" hanging below your boat that won't do anything for you except provide additional leverage and drag all while increasing the risk of hitting an underwater object in shallow water. Either pull the one off that is on the boat and build a new one or add to it with boards that will raise it 5 ".

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