Porting H22A Intake Mani (searched, read, confused)
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Porting H22A Intake Mani (searched, read, confused)
okay im getting ready to port out my intake manifold, i have the stock H22A Intake manifold.
Reading through the threads on here im getting mixed thoughts...
Some people are saying that you want ~130% of your displacement in your plenum volume, and others say you want ~50-60% of displacement in plenum.....
which one of these is more correct? Im wanting to run a high compression (~12.5:1) na H22 with BC Stage 3 Cams.
My idea is to port out the upper part of the manifold as much as i can and port match the intake to match 68mm throttle body, port out the runners a little bit, and take the Butterfly bypass valve and port match it to the runners....
Ideas? Thoughts? Criticism?
anything is welcome
Reading through the threads on here im getting mixed thoughts...
Some people are saying that you want ~130% of your displacement in your plenum volume, and others say you want ~50-60% of displacement in plenum.....
which one of these is more correct? Im wanting to run a high compression (~12.5:1) na H22 with BC Stage 3 Cams.
My idea is to port out the upper part of the manifold as much as i can and port match the intake to match 68mm throttle body, port out the runners a little bit, and take the Butterfly bypass valve and port match it to the runners....
Ideas? Thoughts? Criticism?
anything is welcome
#2
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Re: Porting H22A Intake Mani (searched, read, confused)
i thought it was %100 plenum volume as far as working efficiently but maybe some engines are designed to work with plenums with %130 of their engine displacement. im sure it varies based on the engine design and setup
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Re: Porting H22A Intake Mani (searched, read, confused)
Thats what im shooting for is a 1:1 ratio for plenum volume vs displacement.
Just wondering what everyone else thought on it
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Re: Porting H22A Intake Mani (searched, read, confused)
The only with it is it doesn't show anything for the butterfly bypass and the upper part of the intake mani.... Did they just leave those as is?
#6
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Re: Porting H22A Intake Mani (searched, read, confused)
I didnt touch the top part and just left the butterflies out and it is making good hp looks like this.
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Re: Porting H22A Intake Mani (searched, read, confused)
What kind of setup do you have? High comp? do you think you would see any gains in porting the top half? what size throttle body do you have?
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Re: Porting H22A Intake Mani (searched, read, confused)
Plenum volume depends on the style of intake manifold. I just read up on this last night actually; How to tune and modify engine managment systems, for refurrance. For manifolds with no tuned length runners and with air flow restrictions; 1 to 2 times the engine displacment is ideal. If you have a Hemholtz resonator type, for a 4 cylinder, plenum volume should be 50-60% of engine desplacment.
The Hemholts resonator design uses pressure waves, while the latter uses a big plenum to make sure their's enough air per cylinder, other wise the engine would choke itself.
I'm assuming the modified OEM manifold wouldn't be a Hemholts resonator design, so the plenum design should be 1-2 times the engine displacment.
The Hemholts resonator design uses pressure waves, while the latter uses a big plenum to make sure their's enough air per cylinder, other wise the engine would choke itself.
I'm assuming the modified OEM manifold wouldn't be a Hemholts resonator design, so the plenum design should be 1-2 times the engine displacment.
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Re: Porting H22A Intake Mani (searched, read, confused)
Plenum volume depends on the style of intake manifold. I just read up on this last night actually; How to tune and modify engine managment systems, for refurrance. For manifolds with no tuned length runners and with air flow restrictions; 1 to 2 times the engine displacment is ideal. If you have a Hemholtz resonator type, for a 4 cylinder, plenum volume should be 50-60% of engine desplacment.
The Hemholts resonator design uses pressure waves, while the latter uses a big plenum to make sure their's enough air per cylinder, other wise the engine would choke itself.
I'm assuming the modified OEM manifold wouldn't be a Hemholts resonator design, so the plenum design should be 1-2 times the engine displacment.
The Hemholts resonator design uses pressure waves, while the latter uses a big plenum to make sure their's enough air per cylinder, other wise the engine would choke itself.
I'm assuming the modified OEM manifold wouldn't be a Hemholts resonator design, so the plenum design should be 1-2 times the engine displacment.
thank you!
#13
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Re: Porting H22A Intake Mani (searched, read, confused)
I agree good stuff mine turned out good but i would have loved to had this information before i did it maybe ill do another one now.
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Re: Porting H22A Intake Mani (searched, read, confused)
So do you guys think i would benefit at all by extending the runners out via the butterfly valve? or should i just empty it out for more volume in the plenum?
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Re: Porting H22A Intake Mani (searched, read, confused)
What kind of motor are you building? In theory longer runners will give you better torque down low, whereas shorter runners will help out on the top end. The Blacktrax spacers extend the runner length/volume and their graphs show gains just about everywhere, so don't know if that helps you any.
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Re: Porting H22A Intake Mani (searched, read, confused)
What kind of motor are you building? In theory longer runners will give you better torque down low, whereas shorter runners will help out on the top end. The Blacktrax spacers extend the runner length/volume and their graphs show gains just about everywhere, so don't know if that helps you any.
Exactly what i needed! thank you
so i will extend my runners out and see how much it iproved it
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