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Which aircleaner setup flows the most air?
Posted by: Bob Helt ()
Date: November 20, 2017 05:47PM

There were several different aircleaner setups in Stock Corvairs. But the two types under consideration here are the 1961-63 and some 1964-65 (with AC) compared to the central type used on the 1964s to 69s including the 140hp's

So with all things considered which type of setup flows the best? Does anyone have any data or experiences?

Bob Helt

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Re: Which aircleaner setup flows the most air?
Posted by: MattNall ()
Date: November 20, 2017 05:54PM

Have not seen any actual test data...

One thing spoken by Warren Leveque..

A 140 hp 4 legged cleaner with twin snorkels flows enough for a 350 sbc...





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Which aircleaner setup flows the most air?
Posted by: American Mel ()
Date: November 20, 2017 06:33PM

Similar to what Matt said, I have always heard that, contrary to popular belief, most factory air-cleaners will flow more air than the stock engine will ever need.

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Which aircleaner setup flows the most air?
Posted by: MattNall ()
Date: November 20, 2017 08:35PM

The only real "experience" I have is with a stock engine


At speeds above 60 mph...the crossover with ADDED risers / similar to the Desert Air Pkg., added MPG and acceleration





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Which aircleaner setup flows the most air?
Posted by: davemotohead ()
Date: November 20, 2017 09:15PM

On a few hot cam 140's I have had they ran rich and stumbled when the secondary's were used, it took me a while to figure it out but flipping the air cleaner lid solved the problem, so in my opinion the stock 140 snorkels create a restriction, I found another desert car with the lid flipped as well, and it also has a hot cam in it, so someone else figured that out as well.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca



Edited 1 time(s). Last edit at 11/20/2017 09:16PM by davemotohead.

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Re: Which aircleaner setup flows the most air?
Posted by: Spectre ()
Date: November 21, 2017 05:01AM

I bought my first Corvair from a guy who tracked it. He had drilled holes around the bottom outer edge of the air cleaner housing (just outside the air filter diameter) to improve flow without flipping the lid. Not sure how much it helped but it was a strong 140.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Which aircleaner setup flows the most air?
Posted by: 63turbo ()
Date: November 24, 2017 06:58AM

Here's a super interesting mother of all air cleaner shootout's- just about
every single air cleaner size and configuration you could ever think of is tested on the same engine, and the results are very counter intuitive!!
[www.youtube.com]

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: Which aircleaner setup flows the most air?
Posted by: dryenko ()
Date: November 24, 2017 07:10AM

Velocity stacks win !!
Interesting to count how many times K&N was mentioned.
HMMM...
They should have tested a Airaid type/ brand also.
It actually does some filtering vs K&N type.

Bob C aka Dryenko
Dobson, NC 27017

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Re: Which aircleaner setup flows the most air?
Posted by: 63turbo ()
Date: November 24, 2017 07:16AM

You've got to admit though... the snorkel styles all did horrible, no matter
how big the element, or the type

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: Which aircleaner setup flows the most air?
Posted by: 66Monza140 ()
Date: November 25, 2017 08:09AM

Meaningless test on the video for real world street cars.
Now, if you have a 600+ hp engine in your Corvair, the video may have some meaning to you.

"Give'r hell 'til you see God, then back'er down a notch"

'66 Monza 140 4 sp w/A/C...
Western VT

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Re: Which aircleaner setup flows the most air?
Posted by: 63turbo ()
Date: November 26, 2017 10:54AM

66Monza140 Wrote:
-------------------------------------------------------
> Meaningless test on the video for real world
> street cars.
> Now, if you have a 600+ hp engine in your Corvair,
> the video may have some meaning to you.

Probably a lot more relevant than you realize... consider that all of those
air cleaners tested fit the carburetor (so "should" have been sized roughly correctly) and at least some of those huge snorkel
styles would have had to have been for engines at or close to the same displacement as the test engine, yet many of those air cleaners were starting to be a restriction at half of the rpm peak of the engine. Fairly sizable gains were seen at rpms that are seen on street cars, so it doesn't appear
to have been a case of only relevant for a 600 hp car. I know that for my
own testing on my car, I have noticed some fairly dramatic changes (especially
considering the cost involved) from air cleaner and housing changes. MOST
of the change had absolutely nothing to do with filtering media changes, but
modifications to the airflow path into the carb had easily noticeable effects,
just like the video.

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: Which aircleaner setup flows the most air?
Posted by: MattNall ()
Date: November 26, 2017 11:28AM

Funny how on INTAKE [ negative pressure ] Aero flow makes so much difference...

Yet on exhaust[ positive pressure ] if the pipes are large enough you can have sharp 90 deg. junctions with little losses compared to mandrel bent tubes.

And of course.. at Higher rpms everything becomes more important..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Which aircleaner setup flows the most air?
Posted by: Frank DuVal ()
Date: November 26, 2017 08:43PM

Dave, I drove a 64 110 with the lid flipped for years. Sounded OK, don't know if it helped power or fuel mileage.


I flipped the lid on my 70 Buick Estate Wagon because the Quadrajet on that 455 sounded so much better when the secondaries opened!smileys with beer

So we east coasters ALSO knew this flipping trick.grinning smiley

Frank DuVal

Fredericksburg, VA

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Re: Which aircleaner setup flows the most air?
Posted by: red monza ()
Date: November 27, 2017 10:44AM

And don't forget, the hood was not shut on this test right down on top of the air cleaner like on my vette, the hood has air cleaner marks from the bolt holding it on now...and its a stock 68 L79 air cleaner and filter size and my 49 Fleetline with its built 283...huuummmmm....it does run a 14X3 open filter like the vette.

My 66 140/pg corvair ran all summer with the lid flipped...but I did notice it sounded like a quadrajet when opened vs much quieter with it in stock position. Someone before me drilled about 10-12 holes out of the stock base...about a 1/4 inch each.

I think you have to reach a happy medium....too much air...it slows down...
Not enough air...kills the hp as in the video.

Right now, I have the lid as stock, and it is running the fastest it has ran, but I just re-set all the linkages as per Motor's 1970 Repair Manual and made sure all 4 carbs open fully together.

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Re: Which aircleaner setup flows the most air?
Posted by: gnvair ()
Date: November 27, 2017 11:11AM

If the tune is correct you can never have too much air.
If the car slows down because of too much air then you need to adjust the Air/fuel ratio with more fuel. That is just common sense.
People have gotten lazy. In the old days when you increased breathing of the engine you always had to re-jet.

Lee J

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Re: Which aircleaner setup flows the most air?
Posted by: 65180 ()
Date: November 27, 2017 01:09PM

Back when I was playing around with a 70 Z28 I ran a moroso 14 inch air filter housing with two 3 inch filters which allowed the motor to breath. I was able to spin that 350 to 7500 rpm and it would pull strong with an amazing mid range. I tried one filter instead of two and the motor went flat about 6900 rpm. I also tried a velocity stack, the motor loss a lot of bottom end and some mid range torque. On top end the motor pulled strong to about 7700 rpm. There is no substitute for allowing a motor to breath but you need to manage the air intake correctly. Flip those air cleaner lids on those 140's. It will be like a shot of Affrin in your stuff up nose.

Mike Lake
Tucson, Az
65 Corsa 180
65 Corsa 140 sold
66 Monza PG
66 Monza 4sp sold
61 Lakewood sold
61 La[corvaircenter.com]

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Re: Which aircleaner setup flows the most air?
Posted by: 67 airvair ()
Date: November 28, 2017 11:24AM

Considering the "raise the air cleaner" trick and the velocity stack results on the video, maybe an idea I've had might make sense. The former forms a velocity stack of sorts, so makes sense. The latter bears out the idea behind the velocity stack - that of making a direct straight line path for the air going into the carb.

My idea is to replace just the stock intake crossover by putting a mandrel-bent "S" shaped intake tube on each carb and attach them to the central air cleaner.

Of course, the only thing that would really prove anything worthwhile would have to be dino tested in a "before" and "after" back to back set of tests.

-Mark

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