GSR intake manifold
Joined: Sep 2002
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From: Houston, TX
Re: GSR intake manifold (DeeSeeToo)
I don't have a pic, but it is in an S-shape. The first curve of the "S " has the primary butterfly that opens/closes and the second curve of the "S" has the secondary butterflies. VTEC kicks in first at 4400 rpm when the first butterflies open and kicks REAL hard at 5700 rpm because both butterflies are now fully open. Hope that helps.
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From: MSP
Re: GSR intake manifold (DeeSeeToo)
I can't find any pics. This book I have has great pics of it. The manifold has two rows of holes. One row of 4 on top(non-secondary's), one row of 4 on the bottom(butterflys for VTEC). Basically the air has to travel farther up and over the secondaries which are closed until 5700. this gives the engine more torque down low. When the secondaries open up, air takes a shorter route to the engine.
Kinda hard to explain. I'll try and find a pic.
There aren't first butterflys- at 4400 the cams switch to the bigger lobe.
[Modified by machaf, 7:56 PM 9/23/2002]
[Modified by machaf, 8:13 PM 9/23/2002]
Kinda hard to explain. I'll try and find a pic.
There aren't first butterflys- at 4400 the cams switch to the bigger lobe.
[Modified by machaf, 7:56 PM 9/23/2002]
[Modified by machaf, 8:13 PM 9/23/2002]
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From: Bay Area, CA, USA
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Re: GSR intake manifold (Brad)
Poached from temple of vtec asia
The new B18C intake manifold uses two sets of intake runners. The cut-away diagram of this intake manifold below shows how the runners are arranged. A marks the plenum (which the throttle body attaches to). B is where the intake runners attaches to the cylinder head. C is used to give readers a sense of perspective, it marks the fuel injectors. The top set of runners are curved around the lower set making it longer. The lower set of runners have butterfly valves built into them (marked by D). During low and mid-rpm operations, the valves are closed and only the top set of runners are feeding air into the cylinders. After 5800rpm, the butterfly valves open and air will now be fed into the cylinders via both sets of intake runners. This new intake system works in conjunction with VTEC, which now switches at 4400rpm, to optimize air-flow into the cylinders at all rpms making the power/torque curve of the B18C extremely wide and flat. Peak torque of the B18C is 17.8kgm at 6200rpm but torque output of the B18C is already near or at 17.0kgm all the way from approx 2500rpm right until the 8000rpm, a smaller than 5% spread for practically all operating rpms !!
The new B18C intake manifold uses two sets of intake runners. The cut-away diagram of this intake manifold below shows how the runners are arranged. A marks the plenum (which the throttle body attaches to). B is where the intake runners attaches to the cylinder head. C is used to give readers a sense of perspective, it marks the fuel injectors. The top set of runners are curved around the lower set making it longer. The lower set of runners have butterfly valves built into them (marked by D). During low and mid-rpm operations, the valves are closed and only the top set of runners are feeding air into the cylinders. After 5800rpm, the butterfly valves open and air will now be fed into the cylinders via both sets of intake runners. This new intake system works in conjunction with VTEC, which now switches at 4400rpm, to optimize air-flow into the cylinders at all rpms making the power/torque curve of the B18C extremely wide and flat. Peak torque of the B18C is 17.8kgm at 6200rpm but torque output of the B18C is already near or at 17.0kgm all the way from approx 2500rpm right until the 8000rpm, a smaller than 5% spread for practically all operating rpms !!
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From: USA
Re: GSR intake manifold (mugenracer)
Poached from temple of vtec asia
The new B18C intake manifold uses two sets of intake runners. The cut-away diagram of this intake manifold below shows how the runners are arranged. A marks the plenum (which the throttle body attaches to). B is where the intake runners attaches to the cylinder head. C is used to give readers a sense of perspective, it marks the fuel injectors. The top set of runners are curved around the lower set making it longer. The lower set of runners have butterfly valves built into them (marked by D). During low and mid-rpm operations, the valves are closed and only the top set of runners are feeding air into the cylinders. After 5800rpm, the butterfly valves open and air will now be fed into the cylinders via both sets of intake runners. This new intake system works in conjunction with VTEC, which now switches at 4400rpm, to optimize air-flow into the cylinders at all rpms making the power/torque curve of the B18C extremely wide and flat. Peak torque of the B18C is 17.8kgm at 6200rpm but torque output of the B18C is already near or at 17.0kgm all the way from approx 2500rpm right until the 8000rpm, a smaller than 5% spread for practically all operating rpms !!
The new B18C intake manifold uses two sets of intake runners. The cut-away diagram of this intake manifold below shows how the runners are arranged. A marks the plenum (which the throttle body attaches to). B is where the intake runners attaches to the cylinder head. C is used to give readers a sense of perspective, it marks the fuel injectors. The top set of runners are curved around the lower set making it longer. The lower set of runners have butterfly valves built into them (marked by D). During low and mid-rpm operations, the valves are closed and only the top set of runners are feeding air into the cylinders. After 5800rpm, the butterfly valves open and air will now be fed into the cylinders via both sets of intake runners. This new intake system works in conjunction with VTEC, which now switches at 4400rpm, to optimize air-flow into the cylinders at all rpms making the power/torque curve of the B18C extremely wide and flat. Peak torque of the B18C is 17.8kgm at 6200rpm but torque output of the B18C is already near or at 17.0kgm all the way from approx 2500rpm right until the 8000rpm, a smaller than 5% spread for practically all operating rpms !!
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