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Can I remove this from intake mani? Whats does it do?

 
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Old 12-05-2012, 07:54 PM
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Can I remove this from intake mani? Whats does it do?

This is like a big spacer with 4 breathers in between the intake mani where this one splits in half. Does this help with hp or air flow. Would I gain anything from removing it if possible.
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Old 12-05-2012, 08:01 PM
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Re: Can I remove this from intake mani? Whats does it do?

Forgot the picture its up now.
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Old 12-05-2012, 09:19 PM
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Re: Can I remove this from intake mani? Whats does it do?

I would not take that out.
A) taking space out of the IM reduces it's ability to keep intake temps down before the air reaches the combustion chamber, and
B) those butterfly valves open at a predetermined RPM with that vacuum valve you see right there to allow more airfow to the engine. Not having those and giving your engine that constant amount of airflow would probably hurt your low-end torque numbers.
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Old 12-05-2012, 09:34 PM
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Re: Can I remove this from intake mani? Whats does it do?

Okay sweet I was just curious I was thinking it might have had something to do with air flue mixture which I guess it kinda does, but thank you. i was just making sure it wasnt some old honda mistake since its a b21a1.
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Old 12-05-2012, 09:43 PM
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Re: Can I remove this from intake mani? Whats does it do?

It is weird lookin for sure since I'm only really familiar with the H22, but it looks to have the same function that the intake resonators have on my engine, which people do remove. But since yours is part of the actual IM, I would leave them there.

On the H22 manifold, we can disconnect the vacuum line that opens the butterfly valves that control our VTEC engagement, but in doing so, all it really does is basically leaves VTEC engaged and eff's up our low-range torque. Maybe a 3rd gen guy has some other opinion on that though, if you wanna wait a little while to install it back in there.
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Old 12-05-2012, 09:58 PM
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Re: Can I remove this from intake mani? Whats does it do?

I was thinking about taking it and grinding out the inside with wire brush since it opens up .like a at home port and polish, just while I have my head off waiting for parts wss gonna try to match up ports between gaskets flush with extra time. Not sure if it will make a diffrence but dont see it hurting anything. But theres not really even anything to smooth out besides where port meets gasket.

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Old 12-05-2012, 10:22 PM
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Re: Can I remove this from intake mani? Whats does it do?

Quote:
Originally Posted by Lindso View Post
It is weird lookin for sure since I'm only really familiar with the H22, but it looks to have the same function that the intake resonators have on my engine, which people do remove. But since yours is part of the actual IM, I would leave them there.

On the H22 manifold, we can disconnect the vacuum line that opens the butterfly valves that control our VTEC engagement, but in doing so, all it really does is basically leaves VTEC engaged and eff's up our low-range torque. Maybe a 3rd gen guy has some other opinion on that though, if you wanna wait a little while to install it back in there.
The butterfly valves do not control vtec engagement. The butterfly valves are inside the intake mani and open at a certain time to optimize airflow at at the certain rpm range. Vtec is controlled by the vtec seloniod, which is a separate system.
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Old 12-05-2012, 10:32 PM
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Re: Can I remove this from intake mani? Whats does it do?

*IAB's
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Old 12-05-2012, 10:34 PM
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Re: Can I remove this from intake mani? Whats does it do?

Speaking of, WTF is a butterfly valve. I always call them that and don't know why?

IAB = intake air bypass
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Old 12-05-2012, 10:48 PM
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Re: Can I remove this from intake mani? Whats does it do?

Eh either way, you don't have an H22 that you're putting this on, so that part don't matter. Technically speaking, VTEC on an H22 engages at about 5500rpm, and those valves open at about 4800 to allow more air through the shorter intake runners at higher RPM to maintain HP/TQ. Their opening and VTEC engaging coincide with one another on the H22, so what their function on the B21 is, I'd assume, is still for better airflow at higher RPM's. You don't have to have VTEC to benefit from their function.
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Old 12-06-2012, 05:52 AM
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Re: Can I remove this from intake mani? Whats does it do?

usually they add new spacer to add volume - to get more hp

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Old 12-06-2012, 01:11 PM
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Re: Can I remove this from intake mani? Whats does it do?

Thank you everyone
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