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. Some years ago june 2012 we did a dyno test of a small block mopar 408 see our dyno test 19.
Victor Jr Small Block Chevy Ls1 Intake Manifold
Dual plane vs single plane intake. Each side of the opening feeds four cylinders on a v8 engine. As you can see by the. Edelbrock is here to clear that up and make sure you have the correct manifold for your application and use. Naturally aspirated the combo with the air gap intake made 433 lb ft at 4700 rpm and 452 hp at 6200. So the dyno testing confirms what ken farrell said ie. The engine will respond to the different manifolds in the same way whether carbureted or tbi.
In about 90 of the cases thats a big no good buddy. Torque production with the dual plane exceeded 400 lb ft from 3800 rpm to 5100 rpm making for a broad usable torque curve. With your cam however im guessing that you are using around a 3500 or more stall. Given the fact that the dual plane with fitech gained 17 lbft. Single plane intakes efi normally i would say that isnt the case because on a street car the good dual plane is so much better down low and through the middle that it makes up for anything that the single plane gains up top. Of torque while losing 7 hp over the single plane im going to leave my engine alone.
The classic intake battle between the racy single plane and the dynamic dual plane usually ends up looking something like this. Do you know the difference between a single and dual plane intake manifold. Moving on to the single plane edelbrock victor jr. Single plane manifolds have a single intake opening into the plenum and feeds all 8 cylinders directly. A single plane intake will flow more air than a dual plane intake for the same engine. This engine produced 630hp with a single plane intake and 580 with a dual plane.
Unfortunately for the single plane the mild 351w combination was. In fact in 90 of the cases a dual plane intake will outperform a single plane. As far as picking a manifold dual planes do make better low end torque than single planes. A dual plane manifold has a split opening in the plenum area directly below the carburetor mounting pad. Delivered 427 lb ft at 5000 rpm and 460 hp at 6400. If that is the case in my opinion there would not be enough torque gained to warrant buying a new manifold.
Does that make it better. Intake the peak horsepower output jumped to 441 horsepower at a slightly higher 6500 rpm but peak torque dropped to 405 lb ft at again higher 5000 rpm.
Gallery of Dual Plane Vs Single Plane Intake
