Intake manifold testing, its messy but interesting!

[Mummert]

 

[SenorNoob]

I understand working with what you have, but how much does this test really tell you? Shouldn't the fuel be atomized? I always heard that if it forms drops in the air stream you already have problems.

 

[JoshT]

I understand working with what you have, but how much does this test really tell you?

From what I can see, nothing. Looks like someone playing around blowing air and water through a carburetor and intake. Going to act very different than fuel and airflow through an actual engine.

I may be wrong about that, just my observation and it seems to carry about as much weight as the "science" in that video.

 

[Mummert]

The two manifolds are very different visually. When we dyno both manifolds we'll have power results to apply to visual differences.
Fuel comes out carbs fairly atomized. But as soon as it hits rapid expansion from venturi to plenum you pretty much 60+% air fuel seperation. The seperated fuel strikes the plenum floor. There is a reason they put heat crossovers and ribs in the floor of manifolds trying to help it re-atomize.

Wet flow scares people because they think its supposed to have specific answers. All it shows you is differences between the 2, velocities, trajectory, even audible differences. I'll bet if I posted a dyno sheet of 1 manifold being 10-15 hp better than the other you would look closer to see what you could see.