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what does an exhaust crossover pipe do

by Mr. Ruben Schmitt Published 3 years ago Updated 3 years ago

We're talking about the exhaust crossover pipe that routes hot exhaust gases from the front cylinder bank of a transverse V6 or V8 to the rear cylinder bank. It travels from the front manifold above the transaxle to the rear mani­fold, where it connects to the rest of the exhaust system. Paying the Price

An X-Pipe or an exhaust H-Pipe are at the heart of a performance system and bolted in the center of the car. Also known as a crossover pipe, each system works by balancing the exhaust pulses from either side—or cylinder bank of a V-style engine. The result is a smooth exhaust flow and a more efficient engine.

Full Answer

What size exhaust pipes work best?

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Can you replace an exhaust by pipe?

To replace a section of the exhaust pipe, however, you have other alternatives. First, using a vernier caliper, measure the length and diameter of the damaged area on the pipe you want to repair. You might be able to cut off that damaged section and replace it with a small piece of pipe using exhaust adapters or spacer pipes.

What size pipe is our exhaust?

This is the intake volume. Use this same volume of air for the exhaust system, but then correct for thermal expansion (you need to know exhaust temps to figure things out). Exhaust Pipe Size Estimate: A good section of straight pipe will flow about 115 CFM per square inch of area.

Is a straight pipe exhaust better?

Reason being, a straight pipe exhaust provides a car with much better performance than a standard exhaust system. A straight pipe exhaust will reduce the amount of pressure that is put on an engine by exhaust gases, which will let an engine function better overall.

What is the purpose of an exhaust crossover?

As these low and high pulses move downstream through the exhaust piping, they travel at different speeds. Having an exhaust crossover helps draw these pulses out into a more balanced pattern, which ultimately improves engine output.

Is an exhaust crossover necessary?

It is not needed, but true dual exhausts tend to be inefficient and scavenge poorly. The x-pipe or h-pipe overcomes this problem by forming a venturi effect that draws more exhaust out of the cylinders. It also smoothes out the tone and prevents a raspy sound.

What are the benefits of dual exhaust?

Basically, a dual exhaust system allows the engine to breathe better creating a more complete combustion cycle from the engine. It gets more exhaust our faster allowing the engine, which is basically an air pump, to then suck more air in faster creating more horsepower.

Does dual exhaust need crossover?

Flowmaster® strongly recommends using a crossover tube, otherwise known as an H-pipe or balance pipe on all true dual exhaust systems. The crossover pipe equalizes the exhaust pulses and allows the sounds waves to communicate between both banks of the engine.

Does H pipe reduce drone?

H or X pipe, like others have said, probably won't help the drone. But an H has a throatier more muscle car sound to it than an X, just my 0.02.

What is a straight pipe exhaust?

Straight pipes are often used with sport or racing cars since such exhaust systems allow unrestricted exhaust flow. As the name suggests, it's simply a straight pipe that begins at the engine's header and ends in the air without a muffler.

Are 2 mufflers louder than 1?

Registered. having 2 mufflers on one engine is not going to be as loud as a single muffler of the same type. This is because it's all about the total volume, internal air pressure of the mufflers and the CFM of airflow going through the mufflers.

Is it better to have dual exhaust or single exhaust?

If you have dual exhaust tips to a single exhaust, your vehicle will look great, but it's not doing anything to increase power. Dual exhaust will give you a significant power increase because of the engine's ability to breathe better. Thus, if you are trying to increase horsepower, dual exhaust may be worth the cost.

Do you get better gas mileage with dual exhaust?

Increment in fuel economy Interestingly, using a dual exhaust increases the fuel economy of your vehicle and makes sure it has enough energy to sustain the car. The dual exhaust reduces the strain being put on the engine, so car power can be utilized on other tasks.

Why do you need to connect exhaust pipes?

Connecting the exhaust pipes allows pressure to escape to the other side of the system, with a resulting gain in low-end and mid-range torque.

Why are H and X pipes used in V6 engines?

In short, H- and X-pipe exhaust sections benefit V6 and V8 engines because they connect separate pipes coming from the two different exhaust banks found on those engines. Inline engines where all the cylinders are in a row gain nothing, because they have only one exhaust bank. When it comes to bang for the buck, ...

What happens when two close firing cylinders are exhausting on one bank?

When the two close firing cylinders are exhausting on one bank, there is nothing happening in the other bank, so connecting both pipes effectively enlarged the exhaust system, allowing these exhaust pulses to exit through both sides of the system.

What is an X pipe?

With an X-pipe section, the two sides of the exhaust system are merged rather than just connected, allowing the exhaust from each bank to easily flow into both exhaust pipes. The exhaust pressure on both banks is equalized and power is increased at all engine speeds. As with the H-pipe, an X-pipe also affects the sound of the exhaust.

How close does a V8 engine fire?

On a typical V8 engine, one cylinder on each bank fires within 90 degrees of crankshaft rotation of another cylinder on the same bank. The resulting exhaust pulses are very close together as they travel through the exhaust system and on some vehicles they create a popping noise.

Does the effectiveness of an H-pipe section decrease with higher rpm?

However, the effectiveness of an H-pipe section decreases somewhat at higher rpm . The increased exhaust gas velocity at high rpm causes most of the exhaust to take the path of least resistance and continue down the exhaust pipe, rather than make the turn into the H-pipe.

Does an X pipe sound better than an H pipe?

As with the H-pipe, an X-pi pe also affects the sound of the exhaust. Testing by one exhaust manufacturer indicated an X-pipe equipped system was several decibels quieter than an equivalent H-pipe system. And although sound quality is subjective, many have described the exhaust note from an X-pipe system as higher pitched ...

Not Your Father's Crossover

Just to be clear, we're not talking about a performance crossover pipe -- what is commonly called an H-pipe (or Y-pipe on a rear-wheel-drive vehicle). We're talking about the exhaust crossover pipe that routes hot exhaust gases from the front cylinder bank of a transverse V6 or V8 to the rear cylinder bank.

Paying the Price

The engine and manifolds expand and contract as they warm up and cool off, and the crossover needs some type of flexible joint to keep from cracking, either a flexible metal bellows (as here) or ball joint, spring-loaded flanges at either end.

Change Is Good

And don't think you can get away cheap by trying to patch, weld or braze your busted crossover pipe -- or, for that matter, any other part of the exhaust system. The intense heat and the repeated heating/cooling cycling mean that a welded repair of almost any part of an exhaust system is probably going to fail.

Handling the Hardware

Because of its location high up in the hot engine bay, away from moisture and road salt, the exhaust crossover pipe leads a pretty good life. For that reason, the old one shouldn't be much of a chore to remove. Or so we thought.

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