What is a dual plane intake?

The traditional design choice for most stock intake manifolds, a dual-plane intake manifold is essentially two separate intake manifolds separated by a divided and unequal-height plenum. Each half or “plane” routes air and fuel from that group’s separate plenum area to half the engine’s cylinders.

Why would you use a dual plane intake?

Dual plane manifolds make better power off idle and at cruising rpm. The smaller plenums increase the airflow velocity. They also transmit the induction pulses from the intake valve to the carburetor better. This improves fuel atomization and metering, especially at low rpm.

What is the best dual plane intake?

Dueling Dual Planes

Why should I upgrade my intake manifold?

The stock intake manifolds on most model mustangs are designed to be more functional than powerful. They are designed to get consistent results, and to be cost effective for production. Upgrading your intake will not only increase horsepower, it can also change the rpm range at which the most horsepower is created.

Does a carburetor spacer add horsepower?

When you stack spacers, you are actually improving their insulation properties, and at the same time you’re getting more horsepower. This type of spacer will increase the velocity of your vehicle’s air-to-fuel charge. This means you’ll build low to mid-range torque.

What is an air-gap manifold?

The award-winning RPM Air-Gap intake manifold incorporates the same race-winning technology that’s used on our Victor Series competition intakes. The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power.

What’s better single plane or dual plane intake manifold?

Single-plane manifolds have a single intake opening into the plenum and feeds all 8 cylinders directly. The larger plenum area is less restrictive and supports a higher power range than a comparable dual-plane manifold, which has a wider power range and works better at low rpm.

What is the difference between a single and dual plane intake manifold?

A dual-plane intake manifold has two separate plenums that each feed only four cylinders, while a single-plane intake manifold has a single, open plenum that feeds all eight cylinders. When using a single-plane intake, all cylinders are able to pull fuel and air from the same plenum.

How much horsepower can an intake manifold add?

Depending on your make, model, engine size, and type of intake, truck owners can expect an increase of between 5 and 15hp.

Can a manifold add horsepower?

Adding an aftermarket performance intake manifold with taller, larger and/or longer runners feeds the engine more air and fuel to increase the torque and horsepower output. As the power potential of any engine goes up, so do the physical loads on the pistons, connecting rods, crankshaft and block.

Is a carb spacer worth it?

Spacers are said to improve air/fuel vaporization through and out of the carburetor. Anytime the air/fuel charge has to turn sharply coming off the carb, it increases the chance of separating the fuel from the air. Spacers also have an insulating affect, tending to cool the air/fuel charge.

What’s the difference between single and dual plane intake manifolds?

A dual-plane manifold has a split opening in the plenum area directly below the carburetor mounting pad. Each side of the opening feeds four cylinders on a V8 engine. Single-plane manifolds have a single intake opening into the plenum and feeds all 8 cylinders directly.

When did they start making dual plane manifolds?

“Usually the camshafts and lifters are the limiting factors in developing dual-plane manifolds for the upper rpm ranges,” says Smith, who notes that Edelbrock started manufacturing intake manifolds in 1938. “We are conservative with our numbers, but there aren’t many hydraulic flat tappet lifters that can run 7,000 rpm.”

Can a long stroke engine use a single plane manifold?

A long-stroke engine, however, may see advantages cruising the boulevard with a single-plane manifold. “For street use, a single plane manifold works great on stroker motors,” says Smith, adding that the larger cylinder volume helps dilute the fuel-to-air ratio into a more optimized combination at lower rpm.