#102-----Magnum Induction System Modifications 09/19/07

1/14/2008
David Hughes


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First:
Look consider a good cold air intake system. K&N are systems are alwyas a good fit and give good power gains. We suggest purchasing these from Winner's Circle. They are easy to install, look very nice, and they do give you more power and mileage. Our air filter, P/N 11000 is not a K&N product. You can use K&N products to clean and oil our filters though. We have reports of up to 8 HP increase at the rear wheels on some installations. Designed to replace the smaller filter in most cool air systems.

Second:
Regarding throttle bodies, you must know what a throttle body flows to know if it was any performance advantage to you. The airflow is checked at a regulated test pressure measured in inches. You must know what this pressure is! For example, if a throttle body flows 450CFM when tested at 10" of pressure, it will flow 700CFM when tested at 25" of pressure. Knowing only the CFM and not the test pressure means nothing. For comparison purposes, we have listed the Hughes Engines throttle bodies with flow figures at 10", 25 " and 1.5" Hg of pressure. Before you buy a throttle body from a competitor, check the numbers!

Throttle plate diameter does not determine the final airflow! A throttle body that flows "dry" air versus a carburetor that flows "wet" air are two very different and unrelated situations. A carburetor that flows wet air relies on velocity in the carburetor to achieve the proper air/fuel mixing and optimum mixture conditions for proper burning and power. A fuel injection system uses fuel pressure and the injector spray pattern to achieve the same conditions. Velocity through the throttle body has little if anything to do with power input. The CFM and test pressure is what is important for making a wise choice. Check our flow numbers against all of the other throttle bodies before you buy!

Third:
The stock Magnum "barrel" type intake manifolds have individual runners (ports) that are identical for all the cylinders and are fed by a common plenum. A system like this creates a power increase in the power curve at an RPM range that is determined by the size (area) and length of the runner. The longer and smaller the runner, the lower the RPM range in which the power increase occurs. Conversely, the shorter and larger runners effect the power at higher RPMs. There is also a negative effect when the runner size and length is tuned for the extreme end of the RPM range. In these cases some power will be lost in the other end of the power range. With Magnum intakes we see both situations. The stock intake has long, small runners and is snappy in the idle to 2500 range. The power available at higher RPM, 3,000 and up is severely limited by this intake. On the other hand, there is the M-1 single plane intake both in 2bbl and 4bbl versions. The 2bbl version is for higher RPM use than our modified Stage II OEM intake. The four barrel single plane intake is designed for high RPM drag racing speeds of 4,500 RPM and above. This is why we offer two levels of modified stock "barrel" intakes. Both levels have enlarged and shortened runners.

The Stage I is designed for engines that need a power boost in the 2,000 to 4,000 RPM range. This level performs well on V6 and V8s with a  Stage 1 or Stage 2 throttle body and minor or no internal engine modifications. It lets the engine pull better above 3,000 RPM.

The Stage II is designed for a power boost from 3,000 to 5,000 RPM. This intake works well when high performance camshafts and/or modified heads are used (serious racers).

There will be some increase in power for about 500 RPM on either side of the boost area. Both levels will allow increased power at RPMs considerably above the stock manifold. Our modified intakes also feature a heavy duty, 1/4" thick, billet aluminum cover plate to help eliminate plenum cover gasket blow-out.

We now have an exclusive dual plane intake modified especially for fuel injected Magnum truck & Jeep engines.  It is our FI AirGap. Based on the popular Edelbrock Airgap intake, our FI AirGap features repositioned injector locations. Finally there is an intake that gives more power and increases the mileage 2-4 mpg. This intake will provide more power above 2500RPM than either of our modified barrel intakes or the M/P M1 2 bbl. We are now testing air flow of intake manifolds and the FI AirGap outflows thew modifed barrel and the M1 2bbl so you can expect better power and mileage than any of those other intakes is able to provide. The airflow of our FI AirGap is similar to that of the M1 4bbl intake from M/P but theFI AirGap will have better low end & mid-range plus tha added benfeit of 2-4 mpg increase.
 Hey, with a 22 gallon tank that is 44-88 more miles per tank!

Like most other engine modifications, the intake manifolds work best and produce the most power when used with other high performance parts, especially heads and camshafts. For more information, please see our Magnum Engine Modifications tech article.

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