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Change the propeller on the outboard. If you are looking to get the top speed out of your motor, select a propeller that has a higher pitch. This will slow the acceleration of the motor but the overall top speed will increase. If you are looking for faster acceleration, decrease the pitch.Raising an outboard higher on the transom can reduce drag and raise top speed.Lowering prop pitch will increase acceleration and thrust. Increasing prop pitch will make the boat go faster (provided the engine has enough power to keep the RPMs in the optimum operating range.
- 3 Ways to Make a Boat Faster. Reduce weight. …
- Reduce Weight. Reducing weight is like finding free horsepower, and many boat owners are surprised how much weight they can leave on the dock. …
- Don’t Over-Trim. …
- Change Your Propeller.
Contents
How can I make my hp outboard faster?
- 3 Ways to Make a Boat Faster. Reduce weight. …
- Reduce Weight. Reducing weight is like finding free horsepower, and many boat owners are surprised how much weight they can leave on the dock. …
- Don’t Over-Trim. …
- Change Your Propeller.
Will raising outboard increase speed?
Raising an outboard higher on the transom can reduce drag and raise top speed.
What prop will make my boat faster?
Lowering prop pitch will increase acceleration and thrust. Increasing prop pitch will make the boat go faster (provided the engine has enough power to keep the RPMs in the optimum operating range.
Does a 4 blade prop increase speed?
FOUR BLADE VS. THREE BLADE: A four blade prop will improve your hole-shot and get you on plane faster and keep you there at a lower RPM, hence, better fuel economy at mid range RPM, better handling, stern lift, cruising efficiency, and will resist cavitation and ventilation better than a three blade.
What pitch prop gives more speed?
The lower the prop pitch, the better your hole-shot. However, this comes at a price: top speed. The lower pitch makes the engine reach maximum rpm at slower speeds. Conversely, a higher pitch will deliver greater top speeds, but slower acceleration.
How can I get more power out of my outboard motor?
- Improving Outboard Performance Comes Downs to Setup. …
- Trimming Your Engine Loses Efficiency. …
- Try Different Props to Maximize Performance. …
- Get Rid of the Roostertail Behind the Boat. …
- Get a Jack Plate for Your Outboard Engine. …
- Get Advice from Other Boaters with Your Same Engine.
What is better 3 or 4 blade prop?
The most asked question at the boat shows is almost always “what is the difference between a 3-blade and a 4-blade boat propeller?” The difference between a 3-blade prop vs a 4-blade prop is that the 3-blade (smaller blade ratio) is faster with a higher top speed and the 4-blade (higher blade ratio) has a better hole- …
Will a jack plate increase speed?
With a hydraulic jackplate, you can raise the engine up high and adjust the trim to give the boat a flatter attitude. This not only improves maneuverability, it allows you to increase idle speed to cover more water while creating less disturbance.
Can you supercharge an outboard motor?
For the engine, you can have the electronic control module (ECM) reflashed or you can add a supercharger. Finally, outboard enthusiasts might consider installing a jack plate.
How to Make an Outboard Faster | Gone Outdoors | Your Adventure Awaits
- Article author: goneoutdoors.com
- Reviews from users: 11010
Ratings - Top rated: 3.2
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- Summary of article content: Articles about How to Make an Outboard Faster | Gone Outdoors | Your Adventure Awaits Updating …
- Most searched keywords: Whether you are looking for How to Make an Outboard Faster | Gone Outdoors | Your Adventure Awaits Updating Outboard motors have a predefined horsepower. Making these motors go faster can be accomplished with a few modifications and replacements parts. In some areas, however, having a motor overpowered from it’s original output is illegal.
- Table of Contents:
How to Make a Boat Faster | Discover Boating
- Article author: www.discoverboating.com
- Reviews from users: 22169 Ratings
- Top rated: 4.0
- Lowest rated: 1
- Summary of article content: Articles about How to Make a Boat Faster | Discover Boating Updating …
- Most searched keywords: Whether you are looking for How to Make a Boat Faster | Discover Boating Updating Interested in learning how to make your boat go faster? These three tips can give you a simple boat upgrade in speed and performance. See the difference in boat speed by making these easy adjustments.
- Table of Contents:
Revised Main Menu
3 Ways to Make a Boat Faster
1 Reduce Weight
2 Don’t Over-Trim
3 Change Your Propeller
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Footer Regional Links
Boost Speed with Outboard Engine Height Adjustments – boats.com
- Article author: www.boats.com
- Reviews from users: 25418 Ratings
- Top rated: 3.3
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- Summary of article content: Articles about Boost Speed with Outboard Engine Height Adjustments – boats.com Updating …
- Most searched keywords: Whether you are looking for Boost Speed with Outboard Engine Height Adjustments – boats.com Updating Raising an outboard higher on the transom can reduce drag and raise top speed.
- Table of Contents:
Length Matters
Other Variables
A True 20
5 Outboard Engine Quick Fix Tips
Mercury Introduces 600HP V12 Verado Outboard Engine
Outboard Engine Cooling Systems
Suzuki DF350A Twin Propeller Outboard Engine Introduced
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The Outboard Expert Tohatsu Propane Outboard Engine
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Seeboards Height Adjusters
Proper Propping: Getting the most from your boat’s performance
- Article author: goboatingflorida.com
- Reviews from users: 1418 Ratings
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how can i make my 1975 2 stroke 15 hp johnson go faster | Boating Forum – iboats Boating Forums
- Article author: forums.iboats.com
- Reviews from users: 10811 Ratings
- Top rated: 5.0
- Lowest rated: 1
- Summary of article content: Articles about how can i make my 1975 2 stroke 15 hp johnson go faster | Boating Forum – iboats Boating Forums Get a bigger carb and fine tune it to your engine, open up the reed stops a little so reeds will open wer. … Vent the exhaust gas out above … …
- Most searched keywords: Whether you are looking for how can i make my 1975 2 stroke 15 hp johnson go faster | Boating Forum – iboats Boating Forums Get a bigger carb and fine tune it to your engine, open up the reed stops a little so reeds will open wer. … Vent the exhaust gas out above … i have a 1975 15 hp johnson and i want to make it go faster!!!!! i belong to a bass club that is called pond hoppers. the rules are you can only run a…
- Table of Contents:
How to Make Your Boat’s Engine Faster – boats.com
- Article author: www.boats.com
- Reviews from users: 23005 Ratings
- Top rated: 4.7
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- Summary of article content: Articles about How to Make Your Boat’s Engine Faster – boats.com There are a number of ways you can make your boat go faster, … to boost horsepower in inboards, stern drives, and outboards by a we … …
- Most searched keywords: Whether you are looking for How to Make Your Boat’s Engine Faster – boats.com There are a number of ways you can make your boat go faster, … to boost horsepower in inboards, stern drives, and outboards by a we … If you’d like to turn your boat into a “sleeper,” making your engine faster will help you leave the competition in your wake.
- Table of Contents:
Fast Fixes for a Faster Engine
High RiskHigh Reward Ways to Make Your Engine Faster
How to Make Your Boat Go Faster
Make Your Old Outboard Engine New Again
Prestige 680 S Review
Boost Speed with Outboard Engine Height Adjustments
S&S Designer’s Recognition Rendezvous
5 Outboard Engine Quick Fix Tips
Mercury Introduces 600HP V12 Verado Outboard Engine
Prestige 620 S Flybridge Meets Express in a Motoryacht
Upgrading a 15hp yamaha 4 stroke outboard | Rotorburn
- Article author: www.rotorburn.com
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- Summary of article content: Articles about Upgrading a 15hp yamaha 4 stroke outboard | Rotorburn hey guys i just bought a yamaha 4 stroke 15hp out board last year and now are looking for some upgrades that might give it a bit more power … …
- Most searched keywords: Whether you are looking for Upgrading a 15hp yamaha 4 stroke outboard | Rotorburn hey guys i just bought a yamaha 4 stroke 15hp out board last year and now are looking for some upgrades that might give it a bit more power … hey guys
i just bought a yamaha 4 stroke 15hp out board last year and now are looking for some upgrades that might give it a bit more power i am not…
- Table of Contents:
How to Make a Boat Faster | Discover Boating
- Article author: www.discoverboating.com
- Reviews from users: 41164 Ratings
- Top rated: 3.2
- Lowest rated: 1
- Summary of article content: Articles about How to Make a Boat Faster | Discover Boating These three tips can give you a simple boat upgrade in speed and performance. … Reducing weight is like finding free horsepower, and many boat owners are … …
- Most searched keywords: Whether you are looking for How to Make a Boat Faster | Discover Boating These three tips can give you a simple boat upgrade in speed and performance. … Reducing weight is like finding free horsepower, and many boat owners are … Interested in learning how to make your boat go faster? These three tips can give you a simple boat upgrade in speed and performance. See the difference in boat speed by making these easy adjustments.
- Table of Contents:
Revised Main Menu
3 Ways to Make a Boat Faster
1 Reduce Weight
2 Don’t Over-Trim
3 Change Your Propeller
Footer Menu
Footer Regional Links
Prop for 15 hp Johnson – TinBoats.net
- Article author: tinboats.net
- Reviews from users: 13695 Ratings
- Top rated: 3.3
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- Summary of article content: Articles about Prop for 15 hp Johnson – TinBoats.net The motor is a 1984 15 hp Johnson. I use it f… … The rpm’s were 5K give or take. The prop I’m running is the standard 9.5 x 10. …
- Most searched keywords: Whether you are looking for Prop for 15 hp Johnson – TinBoats.net The motor is a 1984 15 hp Johnson. I use it f… … The rpm’s were 5K give or take. The prop I’m running is the standard 9.5 x 10. This is my first boat and motor. I’ve already learned much from this forum, thanks. My boat is a 1436 Lowe Jon. The motor is a 1984 15 hp Johnson. I use it f…
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How to Make an Outboard Faster
Outboard motors have a predefined horsepower. Making these motors go faster can be accomplished with a few modifications and replacements parts. In some areas, however, having a motor overpowered from it’s original output is illegal.
Change the propeller on the outboard. If you are looking to get the top speed out of your motor, select a propeller that has a higher pitch. This will slow the acceleration of the motor but the overall top speed will increase. If you are looking for faster acceleration, decrease the pitch. The boat will reach it’s max speed faster with a lower pitch but it will not go quite as fast.
Adjust the trim/tilt of the motor. Adjusting the tilt will change how the boat will move through the water. Lowering the trim will cause the front of the boat to raise. Raising the trim will keep the front of the boat lower to the water. Experiment with different tilting to find the sweet spot for the boat and motor combo.
Decarbonize the engine. Start the motor and run until it reaches it’s normal running temperature. Spray an internal engine cleaner directly into the throat of the carburetor. Continue spraying it into the carburetor until the engine dies. Let the motor sit for a half hour. Start the engine. Decarbonizing the engine will remove any carbon that may have been affecting performance.
Carry out any required maintenance. Required maintenance includes changing the oil if it is dirty. Check the pump and it’s impellers. If the impellers look worn, replace the pump. Always drain gas lines when the motor will not be in use for a lengthy period.
How to Make Your Boat Go Faster
Part of the fun of boating is simply the thrill of going fast on the water. And if fast is good, even faster must be better. Here are some simple ways to help almost any family boat reach its full speed potential.
3 Ways to Make a Boat Faster
Reduce weight. Don’t over-trim. Change your propeller.
Now, let’s dive into the details of each of these techniques…
How to Drive a Boat
1. Reduce Weight
Reducing weight is like finding free horsepower, and many boat owners are surprised how much weight they can leave on the dock.
Start at the bow and work your way back, clearing out every storage compartment, and then put back only the essentials.
The spare cooler, the extra fishing rods, the old bottles of sunscreen, the extra towels—each item may not weigh much but together it all adds up. We’ve seen boat owners jettison 250 pounds of “stuff” they didn’t really need on board.
A lighter boat will accelerate more quickly and run with reduced drag because the hull rides a little higher in the water. It may also be more responsive to trim, which can further reduce drag.
Try to place heavier items you do want to keep on board, like a spare propeller, in an aft storage compartment so they are not weighting down the bow.
Finally, on those days you want to run as fast as possible, drain the fresh water and holding tanks if your boat is so equipped, and head out with less than a full tank of fuel.
2. Don’t Over-Trim
The old racer’s motto when in doubt trim it out is true up to a point. Trimming out the sterndrive or outboard lifts the bow, reduces the wetted surface of the hull and thus drag, and increases speed. But if you just trim to the limit you could be over-trimming, and actually losing top speed.
As you trim out the drive, the prop gets closer to the surface of the water and will eventually ventilate, or become contaminated with air, and loose its grip on the water. Engine RPM might keep climbing, but speed will start to go down. This is easy to see with a GPS speedometer or any device with a GPS-generated speed display.
Run the boat up to full throttle and then very gradually add trim, just bumping the trim button with your thumb, and watch the boat speed. If you hear a slight change in pitch in the sound coming from behind the boat, the prop could be starting to slip, and your speed may drop by 1 or 2 MPH. Sometimes you can’t hear the prop slip, however, which is why the GPS is helpful. If boat speed goes down, bump the trim back down just a little until the prop “hooks up” again and your speed is restored.
How to Trim a Boat: Step-by-Step Guide
3. Change Your Propeller
Changing propellers may make a big difference in boat performance (learn more in Boat Propellers: Repairs and Replacements), but propping is a complicated science and a high-performance prop is a significant investment—$600 to $800 and more—so you want to get it right, which means seeking some expert advice from a boat dealer or propeller shop.
If you are running an aluminum prop, changing to even a basic stainless steel prop will usually improve top speed. Because stainless steel is stronger than aluminum, the blades on a stainless prop can be thinner, which reduces drag in the water. Those blades will also not flex under load like those of an aluminum prop, and so will maintain consistent performance.
Ideally engine RPM should be near the top of the WOT operating range, which you can find in your owner’s manual. An outboard may have a WOT range of 5200-6000 RPM, for example, while a sterndrive engine has a WOT range of 5000-5400 RPM. If your WOT RPM is too high or too low, you’ll want to try a prop with more or less pitch. Adding propeller pitch will decrease wide-open throttle (WOT) engine speed, while subtracting pitch will increase WOT RPM.
Changing propeller pitch is like changing gears up or down on a bicycle—in a low gear you can ride away quickly but soon your legs will be spinning and you won’t go very fast. In a high gear you’ll need to mash the pedals to start moving but you’ll eventually reach a faster top speed. In this regard, propping for top speed may produce unsatisfactory acceleration—the boat will take longer to get on plane.
The perfect propeller needs to match the boat power, weight, and hull type. This is where expert advice comes in handy. Some dealers will let you test a prop before purchasing, and may even have “demo” props on the shelf just for that purpose.
Read Next: Understanding a Boat’s Propeller Pitch
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Boost Speed with Outboard Engine Height Adjustments
Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. 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. With the motor trimmed so that the propshaft is parallel to the keel, the anti-ventilation plate should be just about even with your straight edge, and thus even with the boat bottom at the keel.
Length Matters
Other Variables
A True 20
Written by: Charles Plueddeman Charles Plueddeman is Boats.com’s outboard, trailer, and PWC expert. He is a former editor at Boating Magazine and contributor to many national publications since 1986.
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“I would say that on a significant majority of the new boats I see the outboard motor is mounted too low,” says David Greenwood, who in his role as product planning manager at Suzuki Marine tests and rigs dozens of boats each year. “At least it’s lower than necessary, because most boat builders are very conservative and to be fair, they have no idea how their boat is going to be propped, loaded, and used after it’s sold.”The length of an outboard is measured from the top of the clamp bracket to the anti-ventilation plate, and motors are offered in four different lengths: S (short, 15 inches), L (long, 20 inches) XL (25 inches) and XXL (30 inches). This is commonly called the motor’s “shaft length” because a longer motor requires a longer drive shaft, but its length is not really the measurement of the drive shaft. These specific motor lengths were agreed upon by engine and boat builders in the 1960s to create standardization in the industry. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom.The clamp bracket is designed so that the engine’s mounting height on the transom can be adjusted higher than standard. There are a series of four to six holes at the top of the bracket, and the lower bolts actually fit into slots. The spacing between the upper holes is 0.75 inch. This adjustment is provided to let the boat builder or owner fine-tune the mounting height.In some cases boat performance can be improved by mounting the outboard at a higher-than-standard position – with the anti-ventilation plate above the boat bottom. A higher mounting position will reduce lower unit drag and improve top-end speed, although because drag increases exponentially as speed increases, the benefit of reducing drag is more pronounced on faster boats.“My rule of thumb is based on trim,” says Greenwood. “When I run the boat for the first time, if I can trim the motor to its limit without blowing out the propeller, I’m almost certain I can move the motor up at least one hole on the clamp bracket. I want to have the motor high enough to ventilate the prop when trimmed to the max. Conversely, if the motor is too high I won’t be able to trim much at all.”Greenwood says that moving the outboard up one mounting hole – or 0.75 inch – will allow the motor to gain RPM at wide-open throttle because drag is reduced.“If you are 250 RPM low, say about 5700 but you want to get to 6000, raising the motor a hole might get you there, and produce about one additional mile per hour in top speed,” said Greenwood. “Or if you are already at 6000, raising the motor may allow you to move up one increment in prop pitch to stay at 6000 but go faster.”There are disadvantages to raising the motor. With the propeller closer to the surface it’s more likely to ventilate and slip on acceleration, making it harder for the boat to get on plane. And the trim tab above the prop may become less effective and make the boat harder to steer at speed.But if the motor is mounted too low the anti-ventilation plate will drag in the water when the boat is on plane and can cause excessive spray around the motor and transom. Low-speed work boats pushing a heavy load, however, can benefit from having the motor mounted low and the prop deep in the water.There are quite a few variables in play when considering optimal engine height on the transom. A key factor is how far aft the propeller is located from the bottom of the boat. Water flowing from under the boat rises so if the prop is further away from the transom, it may be possible to mount the engine higher. All outboards are different in this regard. For example, a Mercury Verado positions the propeller about six inches further aft than a Mercury OptiMax outboard. A boat rigger’s rule of thumb is that the motor can be raised one inch for each eight to 10 inches of distance between the transom and prop. As the prop moves further aft, it’s also likely to be in cleaner, “harder” water, and be more efficient. This is one reason performance boaters use a set-back device between the boat transom and the motor bracket.Propeller diameter also can affect the ideal engine mounting height. Switching from a small-diameter prop like a 13.5-inch Mercury Laser II to a 14.5-inch Mercury Enertia effectively lowers the swing of the prop blades by a half-inch.Despite the effort to standardize transom height and motor length, there has been some “creep” by both boat and engine builders over the years. Techs I talked to say that most “L” outboards actually measure about 21 inches, which may be intended to provide a little adjustment latitude – the motor can always be moved up if it’s too long for the transom, but it can’t be moved down. This issue became apparent with the introduction a few seasons ago of the Mercury 150 FourStroke . Mercury engineers designed an all-new mid-section and mounting bracket for that motor and made it exactly 20 inches to the anti-ventilation plate, and have since done the same for its new Mercury 70/90/115 models. Last summer I had a dealer tell me a few customers were having trouble with Merc 150s blowing out the prop on hole-shot and in even moderate turns. The motor was too high but mounted as low as possible. Turns out some boat builders are letting transom height get closer to 21 inches or 26 inches.There also can be significant imprecision on fiberglass boats. One tech who rigs a lot of motors tells me he measures every transom, and will find up to an inch variance in transom height on different examples of the same boat model. This was exactly the problem encountered by the dealer with the unhappy Merc 150 customers, with the worst cases being on pontoon boats. Because pontoons can create a frothy stream of aerated water at the transom, the prop really needs to be set down in the water.Greenwood says Suzuki is also moving from a “stretched” length to a “true 20” on its latest DF70A and DF90A motors , and has encountered an occasional issue with a tall transom. The solution is usually a different prop with more blade area, often a four-blade propeller.This article was originally published in June 2015 and was last updated in December 2021.
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