Air Cleaner Question
Thread Starter
Burning Brakes
Joined: Jan 2010
Posts: 884
Likes: 84
From: New Boston, NH
Air Cleaner Question
As I am getting closer and closer to starting my 75' coupe for the first time in a few years, I have decided to replace the stock air cleaer set up for an after market open filter style. What size base would be appropriate? Would a base designed to work with a carburator with a 5 1/8 in diameter work? Also, how much drop does the stock air cleaner assembly have?
As alway, thanks for any and all help.
Bryan
As alway, thanks for any and all help.
Bryan
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Thread Starter
Burning Brakes
Joined: Jan 2010
Posts: 884
Likes: 84
From: New Boston, NH
Why? Your stock set up is fine for a daily driver.
I know that it is, and to be honest, it was my intent to use it. The engine has undergone some changes, both cosmetic and mechanical, and the stock set up just isn't doing if for me. I have gone to a full roller set up, aluminum heads, aluminum intake, tall valve covers etc. With all of that, the stock set up is not as aesthetically pleasing. Additionally, the tall valve covers have changed the geometry for the breather tube. I like the stock 68-71 set up, but I'm not sure how that would stack up with after market products from a cost comparison perspective.
I know that it is, and to be honest, it was my intent to use it. The engine has undergone some changes, both cosmetic and mechanical, and the stock set up just isn't doing if for me. I have gone to a full roller set up, aluminum heads, aluminum intake, tall valve covers etc. With all of that, the stock set up is not as aesthetically pleasing. Additionally, the tall valve covers have changed the geometry for the breather tube. I like the stock 68-71 set up, but I'm not sure how that would stack up with after market products from a cost comparison perspective.
Race Director
Joined: Oct 2000
Posts: 12,655
Likes: 3,116
From: Shamong, NJ
From a performance standpoint, I would say that the stock air cleaner would be better than an open element piece.
The stock unit seals to the hood and draws cool air in from the cowl. An open element one, only feeds the engine hot, under hood air.
If your looking to dress up your air cleaner, the Corvette vendors sell a chrome lid for the stock 73-75 air cleaner.
The stock unit seals to the hood and draws cool air in from the cowl. An open element one, only feeds the engine hot, under hood air.
If your looking to dress up your air cleaner, the Corvette vendors sell a chrome lid for the stock 73-75 air cleaner.
Intermediate
Joined: Jul 2007
Posts: 35
Likes: 0
From: Madison Ohio
From a performance standpoint, I would say that the stock air cleaner would be better than an open element piece.
The stock unit seals to the hood and draws cool air in from the cowl. An open element one, only feeds the engine hot, under hood air.
If your looking to dress up your air cleaner, the Corvette vendors sell a chrome lid for the stock 73-75 air cleaner.
The stock unit seals to the hood and draws cool air in from the cowl. An open element one, only feeds the engine hot, under hood air.
If your looking to dress up your air cleaner, the Corvette vendors sell a chrome lid for the stock 73-75 air cleaner.
Are you sure air is drawn in from the cowl ? My 75 has two air intakes into the air cleaner and does not draw air from the cowl as did the 1974 .
Intermediate
Joined: Jul 2007
Posts: 35
Likes: 0
From: Madison Ohio
Why? Your stock set up is fine for a daily driver.
I know that it is, and to be honest, it was my intent to use it. The engine has undergone some changes, both cosmetic and mechanical, and the stock set up just isn't doing if for me. I have gone to a full roller set up, aluminum heads, aluminum intake, tall valve covers etc. With all of that, the stock set up is not as aesthetically pleasing. Additionally, the tall valve covers have changed the geometry for the breather tube. I like the stock 68-71 set up, but I'm not sure how that would stack up with after market products from a cost comparison perspective.
I know that it is, and to be honest, it was my intent to use it. The engine has undergone some changes, both cosmetic and mechanical, and the stock set up just isn't doing if for me. I have gone to a full roller set up, aluminum heads, aluminum intake, tall valve covers etc. With all of that, the stock set up is not as aesthetically pleasing. Additionally, the tall valve covers have changed the geometry for the breather tube. I like the stock 68-71 set up, but I'm not sure how that would stack up with after market products from a cost comparison perspective.
Race Director
Joined: Oct 2000
Posts: 12,655
Likes: 3,116
From: Shamong, NJ
The 75 air cleaner has dual snorkels, but it also has a small lid that just covers the filter. The base is open between the filter and the sides of the base, and has a ring on it that a seal is installed on. When closed, the hood seals to the air cleaner. Under acceleration, a flap opens at the back of the hood, feeding cool air to the carb. During cold start, idle and low throttle conditions, the carb gets air through the air cleaners 2 snorkels. The rest of the time, air is fed to the carb through the hood.
Le Mans Master
Joined: Sep 2004
Posts: 5,116
Likes: 5
From: Livonia MI
Not sure what type of air intake system you have now, what ever you do, I'd stick with a fresh air intake in front of the radiator as an upgrade. I go through this with lot's of trouble on my cars, and well worth the effort on hot, summer days.
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Melting Slicks
Joined: Apr 2001
Posts: 3,399
Likes: 278
From: Olmsted Falls, Ohio
As I am getting closer and closer to starting my 75' coupe for the first time in a few years, I have decided to replace the stock air cleaer set up for an after market open filter style. What size base would be appropriate? Would a base designed to work with a carburator with a 5 1/8 in diameter work? Also, how much drop does the stock air cleaner assembly have?
As alway, thanks for any and all help.
Bryan
As alway, thanks for any and all help.
Bryan
Q2. Is the carb 5 1/8? if not then measure it.
Q3. Drop - measure the stock base.
You can use a 14" drop base on the stock Qjet. I used to have 3" filter.
If you DON'T have the cowl induction hood, or it has been replaced with something else you might want to use silly putty or clay and measure the clearance between the new air cleaner and the bottom of the hood.
I went back to the stock air cleaner and the cowl induction setup.
Now it's up to you.
Last edited by KenSny; Nov 2, 2012 at 09:31 AM.