What does a flapper do on an exhaust?

A flapper (or baffle) keeps this surge of water from pushing into the exhaust. If your boat has curved downward exhaust tips, they will also prevent water from surging into the engine. Some boats with curved downward exhaust outlets do not have flappers, such as the Nautique Surf Pipe.

Does the Scirocco R have a valved exhaust?

Only the R has an exhaust valve.

Do you need exhaust flappers?

as long as you can live with the look, the internals are not necessary. people with internal flappers who leave boats in the water should make plugs to stick in end of exhausts. the water usually gets in when you aren’t there. maybe even get cute.

What does opening exhaust valves do?

On the power stroke, the combustion pushes the piston down in the cylinder. During this stroke, it is necessary to open the exhaust valve before the piston gets to the bottom of the cylinder. This will allow the excess pressure in the cylinder to “vent out” just before the piston reaches the bottom of the stroke.

What is wet exhaust?

By Tom Burden, Last updated 6/25/2019. Water-cooled inboard engines inject cooling water into the exhaust pipe, which cools the exhaust and muffles engine noise. The exhaust then pushes the water out the exhaust pipe. This is known as a wet exhaust system.

When should the exhaust valve open?

Are valved exhausts bad?

The intake and exhaust valves are important parts of your car’s engine. If you suspect a problem with an intake or exhaust valve, you should not drive your vehicle until the issue has been addressed by a mechanic. Bent or burnt valves could seriously damage your engine if they are not repaired right away.

How long do exhaust risers last?

But they do need replacing every once in a while. Luckily, if you make sure they are properly maintained, you can increase the life span up to 10 – 20 years. On average, however, you’ll have to replace them every 3 – 5 years.

What is dry exhaust?

The difference between a wet and dry exhaust explained! Compare a dry exhaust to the exhaust pipe of the car: a pipe with a flexible connecting piece on the exhaust manifold, discharging the exhaust gases directly to the outside air. A dry muffler is often required to muffle the noise.

What happens if exhaust valve opens late?

If the exhaust valve closes too late in the cycle, the combustion chamber will be “over-scavenged”. This will cause an excessive amount of fuel/air mixture to escape into the exhaust port because the intake valve is still partially open.

Why do exhaust valves burn?

Exhaust valves burn when they fail to seat properly and, as a result, can’t efficiently transfer heat to the cylinder. Ultra-hot gasses scorch these valves beginning at their thin rims. This damage erodes and weakens the valves, exacerbates the poor seating problem, and dramatically accelerates wear.

When should I replace my risers?

Good-quality risers last on average 4 – 5 years in saltwater, and 6 – 8 years in freshwater. Exhaust manifolds will last on average 6 – 8 years. Saltwater use may reduce the life span to 3 years. Light use in fresh water may increase the life span to up to 20 years.

How long do stainless steel risers last?

On average, in saltwater use, good risers last about 4-5 years. At 4 years, you should start worrying about them. Mercruiser 4.2 V6 riser.

Can I convert a wet joint to a dry joint?

Converting from Wet Joint to Dry Joint Exhaust You will most likely need to use the “Short” Dry-Joint elbow/riser as this will be the closest fit to the old Non-Dry Joint Elbow/Riser being replaced. The part # needed for the restrictor style Dry Joint Gasket is 27-864850A02.

Should intake and exhaust valves be open at same time?

Both intake and exhaust valves are open at the same time is called “valve overlap.” The ideal amount of overlap depends on rpm. Higher rpms tolerate more overlap, and the intake charge can be drawn into the cylinder due to the draft caused by the exhaust gasses leaving the cylinder.

What does an exhaust valve actuator do?

Exhaust butterfly valves are a type of actuator used to silence or reduce noise emitted from certain applications. These valves are commonly associated within the automotive industry, as they will often be found working within cars or motorbikes.