Years and years ago we ran a dyno test on a small block Chevrolet with a dual plane intake and Holley carburetor to see just how bad distribution and air-fuel ratios were when you used nitrous on a dual plane intake. We did this test because everyone said you had to use a single plane intake manifold if you were going to run nitrous on an engine. It turns out “everyone” was full of it and had no clue what they were talking about. In fact, because the distribution and air-fuel ratios were so good with the dual plane intake manifold, we swapped over to a single plane intake to compare the two. It turns out, the dual plane was as good as the single plane, across the board. So when we saw this test from Richard Holdener about boost and a dual plane intake, we had to watch.
I’ve run dual plane intake manifolds on way more combos that single plane intakes, so neither boost nor nitrous scares me with them. But it does of course matter what rpm range and power level that you are going to be making as well. Do you have an opinion? Do you think Richard is going to find that a dual plane is a bad call for a boosted combo? How about with a blow through carburetor on top of it?
Check out the video and see. Here is the description:
CAN YOU RUN A DUAL-PLANE INTAKE INTAKE WITH BOOST? DOES A BLOW-THROUGH, BOOSTED COMBINATION WORK WITH A DUAL-PLANE INTAKE? WHAT HAPPENS TO THE CYLINDER-TO-CYLINDER AF DISTRIBUTION? WHAT HAPPENS TO POWER? DOES THE INTAKE DO ANYTHING DIFFERENT UNDER BOOST? CHECK OUT THIS VIDEO WHERE I TESTED A DUAL PLANE INTAKE ON A SMALL BLOCK FORD, WITH A (BLOW THROUGH CARBURETED) SUPERCHARGER AND A TURBO. THEN, TESTED A DUAL PLANE ON A BLOW-THROUGH, CARBURETED 4.8L LS APPLICATION WITH (8) INDIVIDUAL OXYGEN SENSORS FOR EACH CYLINDER. DID BOOST CHANGE THE AF MIXTURE? IT’S ALL HERE!