Honda intake manifold
08-24-2013, 10:45 PM
#743
We have a #4771 Edelbrock Performer-X at the fabricator being put together this week. For an N/A engine with stock or mild race cams, we want the runners just a shade under 11" long. Most aftermarket Honda B series manifold are based on the Type R B18C with shorter runners. The Performer is a bit longer and smaller volume runner so it's closer to our target. A friend did some controlled testing of various runner lengths on a supercharged BP4W head and found best power at around 10.5" runner length. Not sure how that applies to turbos but I have a feeling they'll respond best to the same runner lengths. This all assumes stock (3000-7200) or slightly higher powerband with cams/porting (4000-8200).
The obstacle in our case is making it fit with the NB's ABS pump in the OEM location with those longer runners. So we're making a new bracket for the ABS pump and shoving it over a few inches. If it fits and makes any power, I'll post pics.
The obstacle in our case is making it fit with the NB's ABS pump in the OEM location with those longer runners. So we're making a new bracket for the ABS pump and shoving it over a few inches. If it fits and makes any power, I'll post pics.
(I think it's from top of the valve to the start of the plenum.)
Last edited by 2manyhobyz; 08-25-2013 at 01:03 AM.
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08-25-2013, 04:19 PM
#744
In the case of the port, the valve shuts so that's a terminus.
Measure on the centerline, not short side radius. Port is valve seat to port mouth. You have to average short side and long side. For a very high revving engine with big race specific cams (narrow power band) a 10mm either way can adversely the power. For a lower lift and shorter duration cam at loer outputs like a typical street/HPDE Miata, get it to within 15mm or so and you're good.
I can't tell you what you need for your car. That takes some math and knowledge of how intake systems work on spark ignition 4 cycl engines.
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08-28-2013, 04:46 PM
#747
I think thsi would be cool, and give a little soemthing to play with on the dyno:
Acura Integra GSR (B18C1) Intake manifold
It has secondary runners that are opened by a set of butterfly valves.
I think this manifold is the reason why so many ppl think that VICS works this way.
Acura Integra GSR (B18C1) Intake manifold
It has secondary runners that are opened by a set of butterfly valves.
I think this manifold is the reason why so many ppl think that VICS works this way.
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08-28-2013, 11:12 PM
#753
How do you measure the plenum volume on a dual stack manifold? Can you measure the volume and the runner length(s)? I'm searching but can't find any real data for that, anyone know how close it sits to the frame rail? I'm really considering giving this a shot; I can just swap over my VICS solenoid and tune away assuming I can make it fit...
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08-29-2013, 09:03 PM
#754
So we ended up at 9.5" runner length, about 1.5" short from optimal of 11". Up against the ABS and we still had to move the pump almost 2". I realize now the only way to get the required length is to wrap it around like OEM. To get it right we'll have to build it from scratch.
Being a bit short, we'll lose a bit of power everywhere from optimal length. I'm hoping that it will still flow more peak than a square top. We'll know tomorrow once we get it on a dyno.
Thats a 66mm cast Alpha series Skunk2 TB from a base Integra.
Being a bit short, we'll lose a bit of power everywhere from optimal length. I'm hoping that it will still flow more peak than a square top. We'll know tomorrow once we get it on a dyno.
Thats a 66mm cast Alpha series Skunk2 TB from a base Integra.
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08-30-2013, 09:19 AM
#755
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curious where you came up with the 11" number? (is that what stock is?) But really excited to see your results.
What's the length of the BEGI cast IM runners? I feel like they are around 9" and people are seeing tons of top-end gains with them. on some turbo setups they are even seeing low-end gains and it is improving the turbo response below 4K.
I've been urging people that have considered the Eledelbrock manifolds to go with the performerx over the victorx for the longer runners.
What's the length of the BEGI cast IM runners? I feel like they are around 9" and people are seeing tons of top-end gains with them. on some turbo setups they are even seeing low-end gains and it is improving the turbo response below 4K.
I've been urging people that have considered the Eledelbrock manifolds to go with the performerx over the victorx for the longer runners.
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08-30-2013, 12:03 PM
#757
Emilio, did you guys cut/weld a new flange on or did you weld/re-drill the existing flange? Can't wait to see the numbers.
Edit; And it looks like from the shape of the IM, you might be able to incorporate an IAC for those that want to street the car.
Edit; And it looks like from the shape of the IM, you might be able to incorporate an IAC for those that want to street the car.
Last edited by Der_Idiot; 08-30-2013 at 12:20 PM.
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08-30-2013, 02:00 PM
#758
How do you measure the plenum volume on a dual stack manifold? Can you measure the volume and the runner length(s)? I'm searching but can't find any real data for that, anyone know how close it sits to the frame rail? I'm really considering giving this a shot; I can just swap over my VICS solenoid and tune away assuming I can make it fit...
Last edited by 2manyhobyz; 08-30-2013 at 02:01 PM. Reason: typo
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