[Engo]

Originally Posted by Skip Fix

Runner length-now if both had similar runner length and similar plenum size would be a wash. That is the variable assuming carb and TB and intakes are giving the same mixture and AFR. I would agree with you a single plane probably a little better more equal fuel distribution cylinder to cylinder as "generally" the runners are closer to the same(now a T1 or Tomahawk/Holley they are not the same front to rear like a T2 or Victor.

Runner lenght is of course important in any engine. But to say that any dual plane intake is better than any singel plane due to runner lenght is not even a remotely correct statement. What is a good runner lenght is specific to each engine. A dual plane intake (typically) has unequal lenght runners with unequal cross sections. Not good, compared to most singel plane intakes from a runner lenght perspective.

The one (and only) specific reason that a dual plane intake can produce more low end power on a carburated engine compared to a singel plane intake is that the dual plane intake, with its two plenums, has a better vaccum signal to the CARBURATOR to pull fuel out of it.
That one (and only) reason is a moot point on a TBI engine as it does not need a vaccum signal to pull fuel, because fuel is injected.

Therefore there is no (generic) reason to use a dual plane intake over a singel plane intake on a TBI engine.