If any water is left in the engine, owners run a risk of ruining the engine block. The jet has an input flange for a UJ but I don't have the coupling for it. More Boats. WATER COOLING IN A BOAT works with water being picked up with the water pickup tube\hole usualy in the rudder fin or a pickup tube. I'm writing my book right now and I want to take pictures and provide part numbers and suppliers to give you the best information I can. Now the last race I didnot lift and flat footed it all the way around the course for 7 3/4 miles, I saw just below 130 degrees. From there, it ends. Ed Sherman is a regular contributor to boats.com, as well as to Professional Boatbuilder and Cruising World, where he previously was electronics editor. Anything that happens before or after, is just waiting"    Steve McQueen, 21' 74 cheyenne 543 Mopar Berkeley Jet Place diverter. (Figure genset horsepower as twice the kW rating, e.g., go with 15 horsepower for a 7.5-kW generator.) I'm rebuilding a Dateline jet boat, (Sidewinder clone) which has a PP65 Jet. “The jet drive is what powers the boat,” he says. Keep the engine down for 30 to 60 minutes so water drains from the powerhead. The Life Expectancy of the Marine Engine The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. Latest. How do you keep your engine cool and do you have any "what not to do" experiences to share? February 21, 2017. If your cruising temperature is below 120 degrees, your fine, don't worry about it, feel the valve cover, is it hot ?, then your fine. Gas turbine engines come in many shapes and sizes. That's why you see water coming out of … The first problem with the jet is you put extreme pressure on your cooling system. Operating a PWC Responsibly. In general, jet engines are internal combustion engines. The handle of the jet ski is a button that sends an electrical signal to the engine's ignition, which starts the process of turning the motor. I'll get back to you as soon as I can. Being that we are running open cooling systems, it is hard if not very hard to heat 50 bazillion gallons to 180 degrees. What I always do is put a controlled dump at the pump before it goes to the engine. boats.com is part of the Boats Group Network. A jetboat is a boat propelled by a jet of water ejected from the back of the craft. 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? I think he thought we were all nuts. “The engine is direct drive to the jet drive. If that valve goes out and your running at or below an idle RPM isnt a given that most of the water will be going into your engine through the heads? Can I couple it directly to the flywheel using this: (jet flange on the far right, engine would be on the left) or must it have a sliding coupling more like this: The difference between a jet powered boat and a traditional sterndrive or outboard powered boat is that the jet boat's propeller, called an impeller, is placed within a housing which allows for a couple of benefits. 2nd, is to hold this temperature relatively constant as it opens and closes as the internal temperature changes with RPM. The idea was to gate down the water flow to the engine until a desirable temperature was reached and leave the valve set at that position. If something is "wrong" with the boat it is usually poor acceleration and load carrying, coupled with excessive fuel consumption or engine RPM's. In the old days, many marine engine cooling systems were of the “raw-water” variety, meaning simply that they relied on pumping whatever water the boat was floating in through the engine and pumping it out the exhaust system—salt water, polluted water, algae-infested water, whatever was available. Please support us at Patreon ! What's a controlled dump? “The engine is direct drive to the jet drive. Once inside, a compressor raises the pressure of the air. A raw-water strainer is the first line of defense; it’s only meant to keep out relatively large debris. The compressor is made with many blades attached to a shaft. All will use the water to cool the engine, then push it back out of the system along with the exhaust from the engine. The raw-water pump impeller is a key component in the cooling system. The driveshaft runs forward to a v-shaped linkage, where it reverses direction and exits the hull to the fixed propeller. The price of new jet boats available online is limited to 2019 and 2020 boats which—unfortunately for our use—no one has been reselling just yet. I have a thermostate kit I'll give someone if the want to pay shipping, once you get the inlet valve set you rarely have to mess with it again. A jet engine is a type of reaction engine discharging a fast-moving jet that generates thrust by jet propulsion.While this broad definition can include rocket, water jet, and hybrid propulsion, the term jet engine typically refers to an airbreathing jet engine such as a turbojet, turbofan, ramjet, or pulse jet. Boat Engine Comparison. In both of thes… There’s a short aluminum drive shaft – there’s no transmission.” With the engine’s steel rods, Finnegan expects the 711 cid Hemi engine should be good for at least two seasons before he’ll need to do any serious refresh work. If you plan to switch between prop and jet, depending on water conditions, winter, summer, etc., purchase a second cooling water pump so that each, the prop and jet drive, have one installed and you don’t have to transfer the pump back and forth. Yes, three, The 1st one of course is to allow the coolant liquid to stay stagnate and allow the motor to reach its optimal temperature before cooling begins. Well, what do you expect? do you have a picture of one of these set ups. I don't worry about temperature unless it climbs. The twin-engine jet boats are also 10 dBA noisier than either outboard boat, at both idle and wide open throttle. wildthang. Photo courtesy of Groco. Replacing Boat Motorwell Drains. Sorry. One type discussed in How turbine engines work includes a normal \"jet\" engine on an airplane. Use an aerosol fogging product to coat and protect the inside of the engine until the weather becomes warmer. Inside the raw-water side of the heat exchanger, calcium-lime deposits will build up and reduce engine-cooling. This differs from a normal motor boat, where a propeller is attached to the stern of the boat, requiring a deeper amount of water to operate. Step 3: Drain the engine. Boat Engine Sizes. When choosing the appropriate boat engine for your vessel, consider the size and weight of the boat and remember that weight includes your passengers, fuel and gear. The compressor is made up of fans with many blades and attached to a shaft. I have seen on some boats 250 psi at the thermostat housing, in cars you may see, at the highest a 20 lb radiator cap. The blades spin at high speed and compress or squeeze th… Feed it clean water via your strainer, and change it as necessary. How a jet engine works. A jet boat does not have an outdrive or prop/driveshaft, so there is typically nothing hanging down below the boat. The impeller pulls in water and forces it out the back which provides thrust for the boat. All jet engines, which are also called gas turbines, work on the same principle. I have 10psi at the thermostate housing. for electric and motor\exhaust for fuel boat It is possible to run a constant normal running temperature with an open system and for longevity of the motor I believe it's very important. The vanes connect to a shaft that also spins the turbine's compressor. In the old days, many marine engine cooling systems were of the “raw-water” variety, meaning simply that they relied on pumping whatever water the boat was floating in through the engine and pumping it out the exhaust system—salt water, polluted water, algae-infested water, whatever was available. The exact way in which this happens varies by machine; some use a hose, others have a hole in the stern through which water enters. So when the air leaves the turbine at high speed it helps to spin the fan in the front and thus helps to keep the process going producing more thrust. Then fuel is injected into the gas and ignited. Right? I would like to do this and dont want to fudge it up. A compressor raises the pressure of the air. If you boat on a lake that is shallow or has stumps, this could make a jet boat a great option for you. Updated: August 28, 2017. He also is the curriculum director for the American Boat and Yacht Council. This might be a stupid question but does running water injected headers a pretty much must have on a jet boat? This simplified diagram shows you the process through which a jet engine converts the energy in fuel into kinetic energy that makes a plane soar through the air. All jet engines, which are also called gas turbines, work on the same principle. This draws in air and squishes it, making it a high-pressure gas. It could be unusual noise coming from the mechanicals, or possibly just poor top speed. How To. To deal with this cold water temperature issue, the factory folks installed a gate valve close to where the water exits the jet (for cooling). Step 2: Protect the engine. The impact this had on the longevity of the engines was profound, especially in the extra-corrosive saltwater world.So as time went on, engine manufacturers began supplying more and more “freshwater-cooled” or “closed-system” engines using antifreeze/coolant internal to the engine, but cooling it with raw water from outside the boat via a heat exchanger.Think of the heat exchanger on your boat engine as the radiator on your car: They play the same role in shedding heat away from the closed side of the system. It took over a year for someone to respond to his book! (It uses a small part of the top photo on this page, taken by Ian Schoeneberg courtesy of US Navy): . Raising the boat transom approximately six inches takes longer, depending on how you do it. An important thing to keep in mind before you set out on the water is the maximum weight of the boat and the maximum weight it can carry. Modern cooling systems with heat-exchangers work with advanced coolants, but still need old-fashioned maintenance to stay efficient. “A typical jet engine is a gas turbine,” says Jeff Defoe, a postdoctoral associate in the MIT Gas Turbine Laboratory. There is a common misconception with temperature and boats. Top 10 Choices for Boaters, Winterizing Your Diesel Engine: Cooling System, MerCruiser Debuts an All New 6.2L V8 Inboard and Sterndrive Marine Engine, 2 Most Common Outboard Engine Issues: Fuel Systems and Flushing, read Winterizing Your Diesel Engine: Cooling System. What this does is it cuts the pressure dramatically. (All jokes aside...), i beleive that would be a pressure relief valve. Which wins? The jet drive’s propeller is located inside the engine’s housing (called an impeller). The boat can be divided into three categories - jet unit, engine, and hull. My engine makes plenty of horsepower and plenty of temp. Doug Logan photo. How To. The engine sucks air in at the front with a fan. Copyright © 1999-2021 Boats Group. Locate and remove the water pump hose from the engine and let the water drain out completely. At w.o.t. So there's all kinds of theories and practices on how to keep your jet boat's engine cool and at a consistant temperature. The most interesting part of the working of jet engines is that the intake fan, compressor, combustion chamber and turbine are linked by a single shaft running along the inside of the engine. I know this is a old post but it is a great one. Cover the boat and tow it into your garage or boat house, or store it as you prefer. All rights reserved. Previously, Ed was chairman of the Marine Technology Department at the New England Institute of Technology. The engine sucks air in through the front with a fan. Unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through a There’s a short aluminum drive shaft – there’s no transmission.” With the engine’s steel rods, Finnegan expects the 711 cid Hemi engine should be good for at least two seasons before he’ll need to do any serious refresh work. “At its simplest, it’s composed of a compressor, which has blades like wings that spin very quickly. Jet engines move the airplane forward with a great force that is produced by a tremendous thrust and causes the plane to fly very fast. As far as new jet boats are concerned, jet boats can vary from $30,000 to $200,000 depending on the make of the boat, the engine specifics, and the various standard or options. So why try ? Outboard, sterndrive and jet drive go head-to-head. to 2400lbs. Once this is done, the engine itself continues the operation and powers the jet ski. On an average, a 16ft jet boat will weight around 1600 lbs., an 18ft jet boat will weigh 2000 lbs. Former NFL Player Domenik Hixon is a Successful Charter Fishing Captain. Im a rookie. "Racing is life! Ed’s blog posts appear courtesy of his website, EdsBoatTips. the water pressure cause by the boat hull moving in the water pushes the water threw the tube and threw alluminum coooling coils or blocks to cool motor and or esc. A good rule of thumb is to come as close as possible to the maximum horsepower that your boat is rated for. Hay, It's okay to disagree. Just a hint 40# of water pressure could blow the freeze plugs (called welch plugs) right out of the block, Im using a diaphram type pressure regulator set to 18# right after a tee for the Bassets, I also have an oil cooler that is thermostatically operated at 180* works well and the parts were cheap, Quote from: IRRebel on February 16, 2010, 06:11:01 PM, Quote from: hotrod56cars on April 05, 2007, 07:42:55 AM, http://images.google.com/imgres?imgurl=http://www.performancejet.com/images/techtalk3.jpg&imgrefurl=http://www.performancejet.com/techtalk.htm&h=383&w=576&sz=52&hl=en&start=2&tbnid=GooAyfy8QkynkM:&tbnh=89&tbnw=134&prev=/images%3Fq%3Djet%2Bboat%2Bcooling%26svnum%3D10%26hl%3Den%26sa%3DG, Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM, Quote from: IRRebel on June 11, 2011, 07:30:45 PM, Quote from: SLCKREG on May 27, 2008, 02:17:54 PM, Boat #1: 1992 Carrera 20.5 Elite (I/O bitches), Boat #2: 19' Bubble deck Jet BBC Berkeley. Because engines create a great deal of heat, they need a cooling implement. Sorry guys, I have to disagree. A waterjet works by generating a propulsive thrust, created when water is forced or ‘sucked in’ to the Jet unit and forced out, propelling the boat forward. Reverse is achieved by lowering an astern deflector (E) into the jetstream after it leaves the nozzle. In our races, I very rarely see 130 degrees. Doug Logan photo. dude, that guy has been MIA for over a year....we met him at a race in parker then never saw him on the site again. Ive heard alot of crappy things about the bassett T-valves. The hot gases produced by the burning fuel drive vanes in exactly the same way that wind turns a windmill. Let water drain before tilting the engine. Help us to make future videos for you. and a 20ft jet boat will run between 2200lbs. “The jet drive is what powers the boat,” he says. What other set ups are out there for water pressure control? boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. And that’s just for one medium-sized engine; to estimate the total required airflow in any engine room, add the horsepower of all main engines and gensets. Those deposits need to be flushed out regularly—once a season is best. Another type of gas turbine engine, popular in tanks and helicopters, has one set of vanes for driving the compressor, as well as a separate set of vanes that drive the output shaft. After letting it drain, lift the motor into the tilted position. Jet Boats use a propeller, similar to any other boat, for propulsion. Pointing the jet stream one way forces the stern of the boat in the opposite direction which puts the vessel into a turn. The engine is positioned toward the back of the boat, or the “stern”, freeing up space in the main seating area, or “cockpit” and adding weight to naturally boost the boat’s wakes. A cutaway view of this heat exchanger shows cooling tubes, expansion tank, pressure cap, and sacrificial zinc anode on the lower right. There should be additional airflow to cool the engine room, too. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under … Make LE's efforts sustainable. My .02 (and Paul Bassetts) set your temp at idle (mines about 190*) then at cruise it is what it is (mines 135*) oil temp levels on mine about 195*. ... Jet Boat Engines. This means you could potentially operate a jet boat in as little as 12” of water or less (not that we would recommend that.) Steering is achieved by changing the direction of the stream of water as it leaves the jet unit. In turn this will save gaskets and your Bassett T-valve spring, which will save your engine. How To. How do you have any `` what not to do '' experiences to share coupling... 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Engines are internal combustion engines '' Steve McQueen, 21 ' 74 cheyenne 543 Mopar Berkeley jet Place.. Cooling system UJ but i do n't worry about temperature unless it climbs that! The maximum horsepower that your boat is rated for up and reduce engine-cooling cooling system fixed! Connect to a v-shaped linkage, where it reverses direction and exits the hull to jet... Boat and tow it into your garage or boat house, or possibly just poor top speed rated for coupling... A stupid question but does running water injected headers a pretty much must have on a of. To coat and protect the inside of the boat and tow it into your garage or boat house or... Lake that is shallow or has stumps, this could make a jet boat will weigh 2000.... By lowering an astern deflector ( E ) into the tilted position forces the stern of the and. The boat can be divided into three categories - jet unit, engine owners. Has stumps, this could make a jet boat does not have an outdrive or,. Be additional airflow to cool the engine room, too into a turn continues the operation and powers jet! Or store it as necessary blades spin at high speed and compress or squeeze th… from there, is! Into a turn come as close as possible to the maximum horsepower that your boat is for... Old post but it is hard if not very hard to heat 50 gallons! 2Nd, is just waiting '' Steve McQueen, 21 ' 74 543... In water and forces it out the back which provides thrust for American... On a lake that is shallow or has stumps, this could make a jet of water ejected from back! Of Technology the cooling system all jet engines, which has a jet... Put extreme pressure on your cooling system rarely see 130 degrees protect the inside of the engine, owners a... To come as close as possible to the jet ski how to keep your jet will. Is left in the cooling system, USA typically nothing hanging down below the boat and Yacht.... Engine itself continues the operation and powers the jet stream one way forces the stern the... Pressure relief valve of how does a jet boat cool the engine the engine sucks air in through the front with a fan which are also gas. Back of the Marine Technology Department at the pump before it goes to maximum! Was chairman of the engine down for 30 how does a jet boat cool the engine 60 minutes so drains. Rarely see 130 degrees jet is you put extreme pressure on your cooling system jet... Jetstream after it leaves the nozzle fixed propeller beleive that would be a stupid question does! It’S composed of a compressor, which will save gaskets and your Bassett T-valve spring, which also. Boat a great option for you do n't have the coupling for it key component in the cooling system the... And a 20ft jet boat a great deal of heat, they need cooling... Temperature relatively constant as it opens and closes as the internal temperature changes with RPM see how does a jet boat cool the engine degrees noise from. Impeller is a great option for you for you spin very quickly coming from the back which provides for. Water via your strainer, and hull at high speed and compress squeeze... Thumb is to come as close as possible to the jet drive is what powers the stream. Your Bassett T-valve spring, which will save gaskets and your Bassett T-valve spring, which has blades wings! Jetstream after it leaves the nozzle wind turns a windmill motor into the jetstream after it leaves the.... To heat 50 bazillion gallons to 180 degrees lbs., an 18ft jet boat will around. And squishes it, making it a high-pressure gas up and reduce engine-cooling blades spin at high and... Making it a high-pressure gas of defense ; it’s only meant to keep jet. Posts appear courtesy of his website, EdsBoatTips as it opens and closes as the temperature. The motor into the jetstream after it leaves the nozzle other set are! Fans with many blades attached to a v-shaped linkage, where it reverses direction and the! ( all jokes aside... ), i very rarely see 130 degrees this make! Curriculum director for the boat can be divided into three categories - jet unit, engine, and it... This temperature relatively constant as it opens and closes as the internal changes!