Dual plane Vs Single plane
03-29-2002, 08:54 AM
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Car: 89 Formula
Engine: 305
Transmission: 700r4
Axle/Gears: 3.73
Dual plane Vs Single plane
Ive got a few last pieces to get to finish my motor, but im kinda hung up on what intake to get. I like the power band on the dual plane manifolds like the performer rpm and the holley avenger, but ive seen the real hp advantages in a single plane like the weilden excalabor intake. Ive heard that the only downfall of single plane intakes is that there for real high rpm ( im not planning on pushing this motor past 6200). So whats the better road to take? I know that there are tons of people on this board who have both types, id really like there opinions. Thanks for the help,
Danny
Danny
03-29-2002, 09:18 AM
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Car: 4
Engine: 6
Transmission: 5
With the cam and heads you have, your car will go faster with a dual plane. That generalization about single plane intakes (higher HP) only applies if the rest of the motor has high RPM potentail. You don't have anywhere near enough flow to take advantage of what a SP intake offers.
03-29-2002, 09:57 AM
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Car: No more birdy
Ive run alot of different manifolds dual and single plain and the best of both is really the weiand stealth. If you were wanting a good street manifold then either go with a Performer RPM or a Stealth, the stealth claims a wider powerband.
03-29-2002, 05:31 PM
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Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
If the car sees any kind of street driving then just get a real good dual plane manifold. It offers the best performance in the 1000-3500 rpm range of street driving. An open plane manifold will work but really decreases torque in the low rpm range where you need it the most.
The only time you need to know the maximum range of a manifold is in all out racing. Look at your rpm range of typical engine operation and choose parts that compliment that rpm.
Most dual plane manifolds easily go to 6500 rpm while an open plane manifold usually goes to 8000.
Like carbs, heads and headers you can go too much if the rest of the engine isn't designed for the parts.
The only time you need to know the maximum range of a manifold is in all out racing. Look at your rpm range of typical engine operation and choose parts that compliment that rpm.
Most dual plane manifolds easily go to 6500 rpm while an open plane manifold usually goes to 8000.
Like carbs, heads and headers you can go too much if the rest of the engine isn't designed for the parts.
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