How does an inboard motor work?

Inboard engines are mounted inside the hull’s midsection or in front of the transom. The engine turns a drive shaft that runs through the bottom of the hull and is attached to a propeller at the other end. Many PWC have two-stroke inboard engines that burn oil as a lubricant along with the fuel.

What are the advantages of an inboard motor?


Inboard engines are favorites for water sports like wakeboarding and waterskiing, especially with multiple skiers, as they have better wake control, major towing power and a clear transom for tow ropes. A lower center of gravity also helps to cut through heavy ocean waves.

Is it better to have an inboard or outboard motor?

Inboard motors, for example, tend to last longer than outboard motors. … Inboards on average can run 1,500 hours before tune-ups, while the outboard counterparts typically run 750 hours before service is needed. But buying the inboard motor will cost you more upfront and can require more expensive insurance coverage.

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How does an inboard boat engine cool?

The water flows through the engine and directly out the exhaust. This cooler water absorbs heat from the engine to help keep it cool. Most newer marine engines use an enclosed cooling system. This means that there is a small tank on the top of the engine that uses a combination of fresh water and coolant.

Are inboard outboard motors bad?

It is very easy to damage the inboard engine system, by hitting unseen rocks. Inboard engines are not suited to shallow water. Outboard engines can be lifted higher so you do not hit rocks and other obstacle at the bottom. The only way to damage an outboard engine is to run aground at very high speeds.

How many hours does an inboard engine last?

The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions.

How much does an inboard motor cost?

If you run an inboard, expect to pay somewhere between $1,000 – $1,500. Most sailboats can do with a small 5 – 10 horsepower outboard engine without problems. These engines are easy to maintain and cheap to run.

Why are inboard boats so expensive?

An inboard motor will usually be more expensive due to it being located inside of the boat. This can make it more challenging when it comes to maintenance and repair. … A motor that has a higher horsepower, that can reach higher speeds is going to increase the cost.

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Which is more fuel efficient inboard or outboard?

More Efficient Power

Pound for pound, outboards deliver more power and speed than inboards. Outboard boats are several hundred pounds lighter, and less weight means your boat is faster, easier to tow, and more fuel efficient.

How do you maintain an inboard outboard motor?

Follow these basic steps to maintain your boat’s engine:

  1. Read your owner’s manual.
  2. Avoid fuel problems.
  3. Avoid battery problems.
  4. Complete annual servicing, either DIY or by a professional technician.
  5. Winterize your engine (if used in a colder climate).
  6. Check your propshaft.

What causes an inboard motor to overheat?

Worn or damaged water pump/impeller, clogged passages, cracked/kinked hoses, among other things can easily create an overheat condition, which is one of the deadliest conditions a motor can face. … There are two types of cooling systems commonly found on inboard/outboard boat motors.

How long do Mercruiser engines last?

A friend says “1000 hours” as a general rule for the lifespan of a gas mercruiser inboard/sterndrive engine.

Why is my inboard motor overheating?

Overheating can also be caused by a worn or damaged water pump impeller. … If the impeller is damaged and is missing a vane, make sure any displaced pieces are accounted for and removed. Any debris left in the water passages may reduce flow, which leads to persistent overheating.

Can you run a inboard motor in saltwater?

Can I use a freshwater boat in saltwater, and vice versa? For the most part, freshwater boats can be used in saltwater. … To reduce these risks, be sure to flush out the engine with freshwater following your trip. Also make sure to hose down the hull, as any leftover salt can potentially lead to corrosion.

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Are inboard motors bad for saltwater?

Outboard is fine, but require extra maintenance. An inboard engine with full closed cooling system is your number one option. What materials are my anodes made of? – If you currently have magnesium anodes, you should try to switch them out for aluminum (or zinc) ones. They offer better protection in saltwater.

What are the pros and cons of inboard vs outboard motors?

Outboard vs. Inboard

  • Bill Judge has been both a boater and a boatbuilder all his life. …
  • The diesel inboard offers potential longer-term reliability, enhanced stability, and a longer cruising range. …
  • Outboards provide increased speed, lower cost, the ability to trim completely out of the water, and easier maintenance access.