Differences Between Intake Manifolds

There are more intake manifolds on the market today than you can shake a stick at. There are options for single, double, and even triple carburetors as well as fuel injection options such as stack injection, multi-point or even throttle body. There are different types of manifolds also, including dual-plane, single-plane and even tunnel rams.

Mike and Pat are taking a look at manifolds specifically for their newly-dynoed 408" Stroker as they saw significant gains between a single-plane and dual-plane version. There are several reasons for changes in air flow characteristic, rpm ranges, fuel delivery, and of course power.

A dual-plane separates the manifold into two different plenum sections. Each one along with its own set of runners to connect every other cylinder in the firing order. This allows a dual-plane to see induction pulses every 180º of crankshaft rotation. That allows them to do a better job balancing the air and fuel mixture from cylinder to cylinder throughout the rpm range. Although they are great at fuel distribution, they are quite restrictive in a high-performance application due to the small cross-sectional area in the plenum. They are designed for good drivability and low-to-mid rpm ranges. However, that doesn't mean they won't make power. Several in the Engine Power shop have made over 500 HP.

A single-plane intake manifold has a single open plenum that sees all 8 cylinders. A larger cross-sectional area and a deeper plenum allow the manifold to flow a lot more air than the dual-plane. They are designed for more mid-to-high rpm applications.

If hood clearance isn't an issue, a tunnel ram is a great choice for performance in a wide rpm range. It's still a single-plane design but its advantage is a straight runner with a clear eye shot from the carburetor all the way down to the intake valve. Depending on the runner length and plenum volume they can be designed to make power virtually anywhere in the rpm range.

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[aus]

"Here are the results"
revving noises and B roll

wow those are impressive results.

[richardturk]

You can thank the engineers at Chrysler in the late 50s for designing the first tunnel ram intake.

[Sam-vzle]

So happy you made this video it was extremely helpful! I recently got a 66 tempest with a 326 in it and this will help me decide what intake to go with

[ronjensen]

"here's the results" doesn't give any numbers or "results" no wonder no one really watches this on tv anymore.

[outlawgreaser]

Thanks for sharing your experience! Nice video 👏

[thewholls]

Man I think we need a separate video on what exactly is Pat carrying in his top

There’s a fair bit of gear there

[ronaldlewis]

Just when I thought the Air Gap was a great selection for my 468 BBC street and strip build !

[TMPCarbs]

No numbers or results? What’s the point?

[basketballcory]

But what if you are racing a really heavy truck and need all that dual plane torque off the line? And the distance of the race is only 200ft?

[cbayoo]

What were the numbers? You showed numbers on the BRZ supercharger...lol

[ranchlazyo]

Didn't show numbers cause their wasn't much difference.

[jhutch]

Did you just do an entire episode that told us nothing at all? Go figure.

[ABsnova]

@243 "now that you've seen that" seen what? Lol two Dyno runs just shots of the engine running? Lol what hp numbers? Lol

[stuartbuckley]

So you needed to make a video but didn't want to so you spliced together a couple of old videos. You cant keep viewers that way. It shows laziness.