Cowl Induction hood door - Chevelle Tech
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post #1 of 11 (permalink) Old Apr 14th, 19, 7:41 AM Thread Starter
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Todd
 
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Cowl Induction hood door

Hey everyone, I just replaced my SS domed hood with a functional cowl induction hood. I got it to line up good side to side after several tries.

About the air door, that lines up good with shims that I purchased. I noticed that the top of hood at air door center front, I can push the sheet metal down about a 3/8 of an inch. When I push the sheet metal down with air door closed the air door is perfectly flush with hood when air door is closed. When I let off from pushing that section down it raises back up not flush. Is this a aftermarket screw up?
I need to get hood painted, can a good body guy be able to make that section stay down, maybe weld to hold down, if that section stays down the air door fits very good.
Thanks, Todd
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post #2 of 11 (permalink) Old Apr 14th, 19, 8:41 AM
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Rick
 
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Re: Cowl Induction hood door

That's hard to predict. Can the welder get the sheet metal to meet any of the underlying structure in the hood for a quick tack weld?

Rick

1970 El Camino under Reconstruction - 5.3L LS VORTEC Engine and 4L60E Transmission
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post #3 of 11 (permalink) Old Apr 14th, 19, 9:48 AM
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Stan
 
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Re: Cowl Induction hood door

The door is never closed unless the engine is running. On my stock hood as soon as you start the motor the engine vacuum pulls down hard on the door past flush, about 1/4" or more down in the front. This seems to be the normal position at idle.
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post #4 of 11 (permalink) Old Apr 14th, 19, 1:34 PM
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Al
 
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Re: Cowl Induction hood door

The after market air doors are flat and don't have the curve in them. That's why the hood looks like it's too high in the center.
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post #5 of 11 (permalink) Old Apr 14th, 19, 5:33 PM Thread Starter
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Todd
 
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Re: Cowl Induction hood door

Does anyone make the air door with a curve?
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post #6 of 11 (permalink) Old Apr 14th, 19, 10:35 PM
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Tom Terrific II
 
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Re: Cowl Induction hood door

if want it to look right bend it yourself or have your you body guy do it.. have to be careful not causing a bind in the hinges. take the whole car, not just the hood. anybody here know if the originals were flat or bowed?

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post #7 of 11 (permalink) Old Apr 14th, 19, 11:58 PM
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Re: Cowl Induction hood door

Quote:
Originally Posted by tday815518 View Post
Does anyone make the air door with a curve?
Chevrolet did about 50 years ago. To date I don't think anyone has reproduced a perfect reproduction.

Most people get buy with adjusting for best fit. When the car is not running the door is open and the deviance won't be noticed.

I don't think you'll be able to bend the part into it's correct shape as the louvers will end up breaking.

If it really bugs you, an original piece is your best option. They are out there, just takes time to hunt one down. Watch out for pieces with broken louvers. Without the louvers intact it becomes pretty flexible. I think they are made from pot metal, so repairs are near futile. I have one with a broken louver and the vacuum makes it bend down further in the middle. I also have a repop, but think I'll just sit on that until the original fails completely. In the meantime I 'm in the market too for an original.

I guess a body man or you can bondo the top to look a little better, but bondo who knows how long that will last and you'll notice the extra thickness of the bondo.
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post #8 of 11 (permalink) Old Apr 15th, 19, 12:00 AM
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Re: Cowl Induction hood door

Quote:
Originally Posted by Tom Mobley View Post
if want it to look right bend it yourself or have your you body guy do it.. have to be careful not causing a bind in the hinges. take the whole car, not just the hood. anybody here know if the originals were flat or bowed?
Originals are curved and fit the curve of the hood.

The curve really isn't noticable unlless you have the flat reproduction flapper installed.

The flapper in this video seems to fit perfectly...So my guess is that it is original.

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post #9 of 11 (permalink) Old Apr 15th, 19, 12:10 AM
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Re: Cowl Induction hood door

Here's a video of a guy with a reproduction flapper and how he adjusted it to minimize the appearance of the mismatch.

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post #10 of 11 (permalink) Old Apr 15th, 19, 12:29 AM
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Al
 
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Re: Cowl Induction hood door

I mentioned bondo as a fix, but think it would only be temporary as the door flexes too much and I think the bondo will eventually crack and/or fail. Even a nice new intact door will flex a bit when the vacuum is high. It will flex a large amount with a broken louver. YMMV.
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post #11 of 11 (permalink) Old Apr 15th, 19, 7:15 AM Thread Starter
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Todd
 
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Re: Cowl Induction hood door

thanks guys for all your help. hopefully I can get it right. You would think if they are going to reproduce this part it would have the bow in it.

Another thing, I don"t like the way the vacuum hose and solenoid wire get semi-pinched at the cowl when hood is closed.Maybe that can routed a better way. what do you guys think?
.
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