HomeBrewer

While shopping for a intake for my jeep I keep seeing this info along with
the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM

What exactly does the dual plane and the rpm range mean?

--
_____________________
HomeBrewer
85CJ7 (in Progress)
http://85cj7.blogspot.com/
99XJ Sport
Remove the xxx to reply!

c

"HomeBrewer" <t3e871XXX@earthlink.net> wrote in message
news:2l3m64F8cq4sU1@uni-berlin.de...
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!
>
>

The easy question first. The RPM range is the recommended power range for
the manifold. For a Jeep or other off road vehicle, the low RPM similar to
the range you specified will provide better low end "grunt" for towing,
climbing, etc. It will also provide better throttle response. The low RPM
manifolds like this are always a dual plane design, with long runners having
a small cross sectional area. This keeps the air speed inside the manifold
higher, which is what provides the throttle response and torque. The RPM
range does not mean that the engine will not rev past 4000 RPM, but the
manifold will not be operating at maximum efficiency at this point.

A single plane manifold has a single opening under the carb which feeds all
the cylinders. A dual plane has a divider which in essence splits the
carburetor in half. The right half of the carb usually feeds the left bank
of cylinders, and vice versa. This allows for longer runners, as well as a
smaller plenum volume. The two traits are what helps a manifold improve low
RPM engine efficiency.

HTH
Chris

c

"HomeBrewer" <t3e871XXX@earthlink.net> wrote in message
news:2l3m64F8cq4sU1@uni-berlin.de...
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!
>
>

The easy question first. The RPM range is the recommended power range for
the manifold. For a Jeep or other off road vehicle, the low RPM similar to
the range you specified will provide better low end "grunt" for towing,
climbing, etc. It will also provide better throttle response. The low RPM
manifolds like this are always a dual plane design, with long runners having
a small cross sectional area. This keeps the air speed inside the manifold
higher, which is what provides the throttle response and torque. The RPM
range does not mean that the engine will not rev past 4000 RPM, but the
manifold will not be operating at maximum efficiency at this point.

A single plane manifold has a single opening under the carb which feeds all
the cylinders. A dual plane has a divider which in essence splits the
carburetor in half. The right half of the carb usually feeds the left bank
of cylinders, and vice versa. This allows for longer runners, as well as a
smaller plenum volume. The two traits are what helps a manifold improve low
RPM engine efficiency.

HTH
Chris

c

"HomeBrewer" <t3e871XXX@earthlink.net> wrote in message
news:2l3m64F8cq4sU1@uni-berlin.de...
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!
>
>

The easy question first. The RPM range is the recommended power range for
the manifold. For a Jeep or other off road vehicle, the low RPM similar to
the range you specified will provide better low end "grunt" for towing,
climbing, etc. It will also provide better throttle response. The low RPM
manifolds like this are always a dual plane design, with long runners having
a small cross sectional area. This keeps the air speed inside the manifold
higher, which is what provides the throttle response and torque. The RPM
range does not mean that the engine will not rev past 4000 RPM, but the
manifold will not be operating at maximum efficiency at this point.

A single plane manifold has a single opening under the carb which feeds all
the cylinders. A dual plane has a divider which in essence splits the
carburetor in half. The right half of the carb usually feeds the left bank
of cylinders, and vice versa. This allows for longer runners, as well as a
smaller plenum volume. The two traits are what helps a manifold improve low
RPM engine efficiency.

HTH
Chris

c

"HomeBrewer" <t3e871XXX@earthlink.net> wrote in message
news:2l3m64F8cq4sU1@uni-berlin.de...
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!
>
>

The easy question first. The RPM range is the recommended power range for
the manifold. For a Jeep or other off road vehicle, the low RPM similar to
the range you specified will provide better low end "grunt" for towing,
climbing, etc. It will also provide better throttle response. The low RPM
manifolds like this are always a dual plane design, with long runners having
a small cross sectional area. This keeps the air speed inside the manifold
higher, which is what provides the throttle response and torque. The RPM
range does not mean that the engine will not rev past 4000 RPM, but the
manifold will not be operating at maximum efficiency at this point.

A single plane manifold has a single opening under the carb which feeds all
the cylinders. A dual plane has a divider which in essence splits the
carburetor in half. The right half of the carb usually feeds the left bank
of cylinders, and vice versa. This allows for longer runners, as well as a
smaller plenum volume. The two traits are what helps a manifold improve low
RPM engine efficiency.

HTH
Chris

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The dual plane divides the carburetor in half and the right side
will feed the left head, and left venturi than feeds the right head, you
may just see the bottom of the right side and not the side closest that
runs underneath:
http://www.gmgoodwrench.com/perfpart...3406_large.jpg
The advantage is the runners are longer for low RPM that ram compresses
the mixture for that cylinder waiting for the intake valve to open. The
other type is just an open box with equally length runners compressing
their charge at a much higher RPM:
http://www.gmgoodwrench.com/perfpart...6822_large.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The dual plane divides the carburetor in half and the right side
will feed the left head, and left venturi than feeds the right head, you
may just see the bottom of the right side and not the side closest that
runs underneath:
http://www.gmgoodwrench.com/perfpart...3406_large.jpg
The advantage is the runners are longer for low RPM that ram compresses
the mixture for that cylinder waiting for the intake valve to open. The
other type is just an open box with equally length runners compressing
their charge at a much higher RPM:
http://www.gmgoodwrench.com/perfpart...6822_large.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The dual plane divides the carburetor in half and the right side
will feed the left head, and left venturi than feeds the right head, you
may just see the bottom of the right side and not the side closest that
runs underneath:
http://www.gmgoodwrench.com/perfpart...3406_large.jpg
The advantage is the runners are longer for low RPM that ram compresses
the mixture for that cylinder waiting for the intake valve to open. The
other type is just an open box with equally length runners compressing
their charge at a much higher RPM:
http://www.gmgoodwrench.com/perfpart...6822_large.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

The dual plane divides the carburetor in half and the right side
will feed the left head, and left venturi than feeds the right head, you
may just see the bottom of the right side and not the side closest that
runs underneath:
http://www.gmgoodwrench.com/perfpart...3406_large.jpg
The advantage is the runners are longer for low RPM that ram compresses
the mixture for that cylinder waiting for the intake valve to open. The
other type is just an open box with equally length runners compressing
their charge at a much higher RPM:
http://www.gmgoodwrench.com/perfpart...6822_large.jpg
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

HomeBrewer wrote:
>
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!

Casey Teague

The dual plane refers to the plenum of the intake (big hole where the carb
mounts). A dual plane intake has a divider that splits the hole into two
sections. Edelbrock has several (Dual plane, Single plane, and air gap).
They all make your engine produce hp and torque at different rpm ranges.
The one you want for your Jeep is most likely the Edelbrock Performer Dual
Plane. It should produce the best hp and torque from idle to 4000rpm like
you stated. That's the one I have and I really like it. I also purchased
the cam that goes with it. I've just recently installed the Holley
Projection Fuel Injection kit in my CJ and would highly recommend it. The
carb setup I had before gave me all kinds of problems when off road. I
don't have to worry about stalling anymore. The fuel injection combined
with the Edelbrock intake and cam are a great combination.

Hope I answered your question. I'm pretty sure this is correct info. I'm
sure someone will chime in if I've made a mistake.

Casey Teague
www.justjeepz.com

"HomeBrewer" <t3e871XXX@earthlink.net> wrote in message
news:2l3m64F8cq4sU1@uni-berlin.de...
> While shopping for a intake for my jeep I keep seeing this info along with
> the edelbrock ads: Dual Plane, single four barrel - off idle to 4000 RPM
>
> What exactly does the dual plane and the rpm range mean?
>
> --
> _____________________
> HomeBrewer
> 85CJ7 (in Progress)
> http://85cj7.blogspot.com/
> 99XJ Sport
> Remove the xxx to reply!
>
>