Cowl induction air door (continue) - Chevelle Tech
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post #1 of 15 (permalink) Old Apr 15th, 19, 5:04 PM Thread Starter
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Todd
 
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Cowl induction air door (continue)

From what I gather the cowl door is connected to the intake manifold direct vacuum, is that right? along with the check valve.
I tried to bend door a little to get bow, curve in air door, broke a few ribs but I thought that would be the simple part fixing door. I got it to line up satisfactory, flush, it was all good until a fired up the engine, now it sucks it down in the center and when I give it gas lightly the door moves a little I can see it. trying to figure out what to do
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post #2 of 15 (permalink) Old Apr 15th, 19, 6:45 PM
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That door takes a lot of stress during the opening and closing functions. With some broken areas it becomes weaker. You can slow it down closing with a different vacuum pod, but that may take some trial and error. If the curve of the original is that important for you, I would start looking for an original door.
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post #3 of 15 (permalink) Old Apr 15th, 19, 8:30 PM
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Re: Cowl induction air door (continue)

I just saw an NOS flapper door on eBay go for a buck and a half ($150.00). I was thinking about pulling the trigger and someone else beat me to it... You snooze, you loose.
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post #4 of 15 (permalink) Old Apr 17th, 19, 7:00 AM Thread Starter
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I ordered one from jegs, I will see how this works out🤞
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post #5 of 15 (permalink) Old Apr 18th, 19, 10:01 AM
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Re: Cowl induction air door (continue)

Just remember the door will always get pulled down past flush in the centre when the engine is started. Thats the way they all operate. It will only start to open under moderate to hard acceleration. If you want the door to be more active under normal cruising you can put a restrictor in the vacuum line, it does help a bit. If you have engine mods that reduce vacuum from 12 to 8 or less, the door will be much more active at all rpms.
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post #6 of 15 (permalink) Old Apr 18th, 19, 2:29 PM Thread Starter
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Cool , good idea
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post #7 of 15 (permalink) Old Apr 18th, 19, 2:33 PM Thread Starter
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Where do I get a vacuum line restrictor?
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post #8 of 15 (permalink) Old Apr 18th, 19, 5:34 PM
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Well. The Vacuum Delay Valve used on the CI system is probably a little on the large size. I replaced mine but have yet to test it. This may give you a little background if you want to “experiment “?

https://en.m.wikipedia.org/wiki/Vacuum_delay_valve

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post #9 of 15 (permalink) Old Apr 18th, 19, 6:54 PM
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This is my goal for CI door operation. It’s from DZAUTO. Notice how smooth it opens/closes. He’s using an obsolete valve GM Part 8997937

https://www.youtube.com/watch?v=Xra1mG1yE8Y

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post #10 of 15 (permalink) Old Apr 19th, 19, 4:51 AM Thread Starter
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Re: Cowl induction air door (continue)

amazing!!!
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post #11 of 15 (permalink) Old Apr 19th, 19, 10:05 AM
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Re: Cowl induction air door (continue)

Quote:
Originally Posted by tday815518 View Post
Where do I get a vacuum line restrictor?
I just use a plastic vacuum line connector, fill it with JB Weld then drill a much smaller hole.
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post #12 of 15 (permalink) Old Apr 19th, 19, 10:45 AM
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Re: Cowl induction air door (continue)

Anyone know what size orifice is needed?
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post #13 of 15 (permalink) Old Apr 20th, 19, 11:38 AM Thread Starter
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Re: Cowl induction air door (continue)

Does anyone where I can get the vacuum actuator bolt that connects actuator to air door ? 3922128
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post #14 of 15 (permalink) Old Apr 22nd, 19, 10:01 AM
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Re: Cowl induction air door (continue)

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Originally Posted by Dean View Post
Anyone know what size orifice is needed?
Start with the smallest drill bit you can get and work your way up until the door closes on start up, then increase the hole progressively until you get the amount of action on the door you prefer.
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post #15 of 15 (permalink) Old Apr 23rd, 19, 9:38 AM Thread Starter
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Still working on it. I will post pics and what I did
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