Aftermarket Cowl Induction Hood for Cooler Air? - Chevelle Tech
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post #1 of 17 (permalink) Old May 2nd, 19, 5:16 PM Thread Starter
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Bill
 
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Question Aftermarket Cowl Induction Hood for Cooler Air?

Performance Mod

65 Chevelle
BBC
AMD 2" Cowl Induction hood
14" Open-element Chrome Air Cleaner, w/drop-base (Carb), AC Delco style

All I wish to do is use the '69 Z-28 or '70 Chevelle single-snorkel "outer" air cleaner w/above, which seals to the hood via a rubber moulding ring. I would remove the snorkel horn & seal the resulting hole. This arrangement has the carb breathing only non-underhood air. (No flapper)

I'm betting many others have done this adaptation over many years with all-years of Chevelles. AMD's underhood CI sheetmetal stamping invites what appears to a factory-appearing mod.

Did you detect any Performance gain from the mod described above?
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post #2 of 17 (permalink) Old May 2nd, 19, 8:03 PM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Yes (as long as the Air Cleaner is sealed to the underside of the hood), under the correct atmospheric temperature conditions there will be a seat-of-the-pants increase.
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post #3 of 17 (permalink) Old May 3rd, 19, 8:47 AM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Go through Oliver's Elcamino thread. He used a kit from Summit.
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post #4 of 17 (permalink) Old May 3rd, 19, 10:12 AM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Lol, I just did this mod to my stock non C/I hood (domed), but built an air box because my hood didn’t have the sealing ring. Also had to cut out the block off plate in the hood. I call it “true cowl induction”.

Used 5052 aluminum and an old air cleaner base. My fitech has an intake air temp sensor, on previous logs I was seeing over 110 deg temps. The new arrangement is at minimum 25 deg cooler.

First two pics are of the template. Yes, those are toothpicks to set the trim height, minus the compressed bulb seal.
Was able to complete it in a weekend. All in, I’m out about 75 bucks.
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post #5 of 17 (permalink) Old May 3rd, 19, 10:31 AM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Like it!!I used a Camaro CAI on my 67 it worked fine. Did I feel anything? Not really around town on the hwy it may have helped.Never tracked it though
Do believe lowering the air temp a bunch is a good thing. WIsh I had metal fab skills!!!
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post #6 of 17 (permalink) Old May 3rd, 19, 7:16 PM
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Quote:
Originally Posted by Tarheel Chevelle View Post
Performance Mod

65 Chevelle
BBC
AMD 2" Cowl Induction hood
14" Open-element Chrome Air Cleaner, w/drop-base (Carb), AC Delco style

All I wish to do is use the '69 Z-28 or '70 Chevelle single-snorkel "outer" air cleaner w/above, which seals to the hood via a rubber moulding ring. I would remove the snorkel horn & seal the resulting hole. This arrangement has the carb breathing only non-underhood air. (No flapper)

I'm betting many others have done this adaptation over many years with all-years of Chevelles. AMD's underhood CI sheetmetal stamping invites what appears to a factory-appearing mod.

Did you detect any Performance gain from the mod described above?
Where did you find a steel 65 cowl hood?
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post #7 of 17 (permalink) Old May 4th, 19, 8:15 PM Thread Starter
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Bill
 
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Post should read 66. Too late to edit. My apologies.
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post #8 of 17 (permalink) Old May 4th, 19, 8:31 PM
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Quote:
Originally Posted by Tarheel Chevelle View Post
Post should read 66. Too late to edit. My apologies.
No problem, I wish one was made for a 65!
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post #9 of 17 (permalink) Old May 4th, 19, 8:45 PM
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Lew
 
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Here I mine. I have a 1965 Chevelle with a 2.5-3 inch cowl used the stuff from a 1970 Chevelle. That is a 16x4 air filter on a Holley 4150 carb. Standard deck height BBC 540. I have a Hardwood cowl seal in the hood.
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post #10 of 17 (permalink) Old May 5th, 19, 8:03 AM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Here is a photo shows the entire set up better.
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post #11 of 17 (permalink) Old May 5th, 19, 11:38 AM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Simple and clean Lew how do you like it?
I can only think once the engine is hot it would make some difference (ambient vs engine bay temp)

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post #12 of 17 (permalink) Old May 5th, 19, 12:07 PM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

I know that my Monte SS isn't quite the same car,but the end result would be similar.
I used a Model # 14HS from Ram Air Box,heres a link;
Models of Ram Air Box
Heres a picture of it installed;
Guy
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post #13 of 17 (permalink) Old May 5th, 19, 12:32 PM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Quote:
Originally Posted by SSJohn View Post
Lol, I just did this mod to my stock non C/I hood (domed), but built an air box because my hood didn’t have the sealing ring. Also had to cut out the block off plate in the hood. I call it “true cowl induction”.

Used 5052 aluminum and an old air cleaner base. My fitech has an intake air temp sensor, on previous logs I was seeing over 110 deg temps. The new arrangement is at minimum 25 deg cooler.

First two pics are of the template. Yes, those are toothpicks to set the trim height, minus the compressed bulb seal.
Was able to complete it in a weekend. All in, I’m out about 75 bucks.
Nice work.
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post #14 of 17 (permalink) Old May 5th, 19, 4:16 PM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Quote:
Originally Posted by cuisinartvette View Post
Simple and clean Lew how do you like it?
I can only think once the engine is hot it would make some difference (ambient vs engine bay temp)
It works well I have been running this set up since 1992 (540 came in 1994). Air cleaner is cold to the touch even in traffic it is not too bad at highway speed of course it is fine. That is a 16x4 filter. I would say a solid 30 degrees cooler than outside air when I did a thermometer test. The air cleaner base is a cut up 1970 Chevelle cowl induction base. I will post another photo.
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post #15 of 17 (permalink) Old May 5th, 19, 6:30 PM
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Re: Aftermarket Cowl Induction Hood for Cooler Air?

Here is a photo of the base. Basically a 16 inch drop base with the cowl induction part left intact but the middle is cut out for the new wide body base. It is riveted to the aluminum drop base so the cowl seal work like the original design. If you look through windshield you can see air cleaner very easy. The red line in the base is so I know where front is every time. I meant to say above that the it is very close to the outside air temp and probably 30-40 degrees cooler than the under hood air especially at speed.
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Last edited by Lew540; May 5th, 19 at 6:33 PM. Reason: fix
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