Kelvin, thanks for the information. I suspect the stock GM intake is
dual plane, mine appears to have the "two sets of intake tracts"? A
single plane intake manifold would have one large intake tract that
serves all four barrels of the carburetor?
Larry Hoy, Denver, CO USA
1969 MGB Roadster (one half of a V8)
1987 Jaguar XJ6 Vanden Plas
It's not how fast you go, it's how fast you go fast.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On Thu, 26 Feb 1998 09:19:53 -0800 Kelvin Dodd <kdodd@West.net> writes:
>Larry A Hoy wrote:
>
>> get a question I have answered. Can anyone tell me the difference
>> between a dual plane and a single plane intake manifold? I have no
>clue.
>
>Larry:
> The dual plane manifold has two sets of intake tracts sandwiched
>one on top of the other. The smaller bore tract connects to the primary
>side of the carb. The larger bore connects to the secondary. When
>running under light load, only the primary of the carb. is operating.
>
>The intake tract being a small diameter keeps the intake charge flowing
>at high speed which helps distribution and keeps the fuel atomised. In
>theory, the smaller intake tract will increase low load drivability.
>The combined bore of the prim. and sec. tracts can in theory be larger
>allowing more flow at the top end whilst retaining drivability at the
>low end. One drawback is that the maximum bore is restricted by the
>metal between the two tracts, but on our small bore engines this is not
>a problem.
> So in a nutshell. Low end drivability and economy requires a
>small carb. with small intake tracts to maintain high speed intake flow.
> High end power requires a big carb. with intake tracts matched to the
>bore size to allow the maximum flow the engine can pump. The dual plane
>manifold was designed to combine these features.
>
> Hope this answers your question. Kelvin.
>
>
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