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More Interesting Trivia! confused smiley
Posted by: oldqmguy ()
Date: April 01, 2018 11:49AM

Here is a bit of information you 'might' find interesting. eye rolling smiley

This applies to Late Models and the "Motor Compt. Vent Duct Panel" (direct quote from the 1966 Assembly Manual under the "Alphabetical Option List" page K47 A2 "Cleaner-Air-Oil Bath." drinking smiley

Two items were added to this drawing that do not relate to the Air Filter.

If you look 'through' the openings in the Motor Comp. Vent Duct Panel (this is where the 'cooling air' comes into the engine compartment, you will see two oval holes in the 'bottom' of that duct, one on the left and one on the right.

These holes are OPEN in 99% of the LM's I have seen in the past several years (including my current '67). sad smiley

OPEN means you can look through the holes and see the ground and assorted car parts! It also means that the engine cooling fan can draw AIR+DIRT+EXHAUST+?? through those holes instead of the upper opening where it should be coming from. angry smiley

Getting old has some advantages because I remember that there should be "something" blocking those holes. I seemed to remember some sort of 'flapper' that would allow water or other liquids to flow OUT but not allow Air IN!

OK, I tell myself, this has to be easy to find. So I start looking at all the 'usual manuals and catalogs' and don't find anything that even talks about that area of the body?? moody smiley

I was looking through the 1966 Assembly Manual and decided to go 'page by page' to see if ANYTHING was shown about that area. I was about to give up when I looked at that Option page!

The "added drawing and part" show this area of the body and the "Valve Assembly" that fits those holes!!! I will never figure out 'why' someone put this on this particular page (it shows drawings and parts for Oil Bath attachment to either a 2-carb or turbo air intake). eye popping smiley

GM called it a "Valve Assembly" with a part number of 4477679.

Now that I knew what I was looking for I still could not find it.

Looking for an entirely different part I DID find what I though was the right part in the Clark's catalog (again, on a page you would not expect to find those parts!). confused smiley

I am now the owner of two "Rubber Drains" and their Holders (C5786 & C5786R)!!! grinning smileygrinning smiley

Now if it ever warms up? eye rolling smiley

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: More Interesting Trivia! confused smiley
Posted by: 66vairman ()
Date: April 01, 2018 12:13PM

Yes those drain hole items are usually long gone on most Corvairs.

I found those rubber parts years ago when I could not find a rubber part and out of frustration I just typed in "Rubber" and found a catalog page titled "Rubber Parts" (pgs. 232-233). Actually a logical place to put the item. Amazing how many rubber parts Clark's has in stock. Once you find the page you'll be ordering other items.

I do wonder how many folks miss this page in Clark's catalog.

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Re: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 01, 2018 12:20PM

oldqmguy Wrote:
-------------------------------------------------------

> If you look 'through' the openings in the Motor
> Comp. Vent Duct Panel (this is where the 'cooling
> air' comes into the engine compartment, you will
> see two oval holes in the 'bottom' of that duct,
> one on the left and one on the right.
>
> These holes are OPEN in 99% of the LM's I have
> seen in the past several years (including my
> current '67). sad smiley
=======================================================

I think they were deleted because in heave RAIN areas... where the car is setting outside..... it will flood....especially with and debris.

I use screen to keep the rodents out.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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Re: More Interesting Trivia! confused smiley
Posted by: oldqmguy ()
Date: April 01, 2018 12:28PM

Matt,

Screen is fine for rodents, but I don't want to pull "air" (or what passes for it down there) into the engine compartment.

My big surprise was the total lack of information about that area of the body. They don't even mention the "air input panel" (I don't know the right word), that panel that sits between the bottom of the rear window and the engine lid opening.

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 01, 2018 12:35PM

That's on top... and any heat is diluted...imo





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
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Re: More Interesting Trivia! confused smiley
Posted by: Lane66m ()
Date: April 01, 2018 12:51PM

Dale:

I found the ones in my Monza were rotted a few weeks ago. I had not yet got around to research the parts.

I am with you. If GM thought screen would be good, they would have put in the cheaper material. Every bean counts in producing a car in the thousands.

My next Clark's order will have the 2 rubber drain boots and retainers.

Thank you for bringing this subject up.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1968 Camaro SS Coupe 350 CI 295+ HP PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2018 Chevrolet Silverado LTZ Z71 Centennial Edition
1947 Farmall A tractor 15 hp


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Re: More Interesting Trivia! confused smiley
Posted by: American Mel ()
Date: April 02, 2018 08:50PM

Clark's catalog also makes it sound like that was a '65 item only.
I personally would not think them a needed part.
It is my understanding that the airflow coming down the back window, creates a high-pressure area which actually PUSHES air into the rear intake.
The air coming in from above being at greater pressure than what is under the car would actually flow OUT of those little ovals, rather than in through them!

.
-----------------------------------------------
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: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 02, 2018 08:56PM

Actually it's just the opposite Mel

Right behind window is LOW pressure... All air movement is caused by fan and carbs..

Why Yenko added flaps further back... rather than a scoop over the vent..

To find out.... if you have an engine that gets dirty.... add the plugs / drains and clean your engine....on top..

Then drive a few Thou miles and check





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: More Interesting Trivia! confused smiley
Posted by: American Mel ()
Date: April 02, 2018 09:05PM

Okay.
Just goes to show that fake news is even in Corvair publications! grinning smiley

.
-----------------------------------------------
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: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 02, 2018 09:08PM

Really Which one?

There's pics here / on the web of Aeroned's String test...





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: More Interesting Trivia! confused smiley
Posted by: American Mel ()
Date: April 02, 2018 09:17PM

I can't remember.
Do you know how many "Corvair books" I have read?
Me neither!
A lot.
Anything that I could get my hands on over the years though.
I wish my memory was that good!
But I do remember at least one of them stated such was the case.
In fact, they even insinuated that at freeway speeds the fan was of little use due to the induced air!

.
-----------------------------------------------
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: More Interesting Trivia! confused smiley
Posted by: oldqmguy ()
Date: April 02, 2018 09:48PM

Look at the "Air Intake Plenum" (for lack of a better description (Chevy didn't help much,none of the books even mention that area) and see the convoluted path the air must take to get to the engine (sometimes thru the A/C Coils)!

If these 'valves' were not necessary Chevy bean counters would not have allowed them to be installed.

At $15 it just seems reasonable to install them.

JMHO!

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: More Interesting Trivia! confused smiley
Posted by: JimBrandberg ()
Date: April 03, 2018 04:45AM

I believe the area in front of the windshield is a high pressure area, that's the reasoning behind cowl induction.
I believe the area behind the rear window is low pressure. Matt is correct about the Yenko hood flaps because of that. The area behind the rear window is not air inducing at speed.
Aeroned is the guy when it comes to Corvair aerodynamics.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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Re: More Interesting Trivia! confused smiley
Posted by: flat_six ()
Date: April 03, 2018 08:20AM

The rubber drain boot/flaps were standard on the 65's. Most will still have the metal retainers in the holes, even though the rubber has long rotted away.

The 1966 models had aggressive cost reduction. GM realized that the profit margins on the relatively complex Corvair were no where near what they were achieving on other models such as the Chevy II.

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Re: More Interesting Trivia! confused smiley
Posted by: 66vairman ()
Date: April 03, 2018 09:01AM

My LOS built 66 had the remnants of the drain parts.

I've never seen anything to suggest "aggressive cost cutting" on the 66 models. In fact a number of things were improved over the 65 models.

The Clark's catalog says their boot "Apparently originated in 65". That's vague, but doesn't suggest it is only a 65 only part.

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Re: More Interesting Trivia! confused smiley
Posted by: MtnVairMike ()
Date: April 03, 2018 09:25AM

Wow, neat information. Since I have cars from all types of places look up "Tom's Knob" for MGB's. You will see a very similar device.

They were prone on MGB's with getting "stiff" and not opening up to drain the water causing the interior to flood. Of course it's on the other end of the car...eye rolling smiley

Thanks,

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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Re: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 03, 2018 10:57AM

Here's Ned's Pics... off of Brian Blackwell's Autocross site..

[autoxer.skiblack.com]





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: More Interesting Trivia! confused smiley
Posted by: MtnVairMike ()
Date: April 03, 2018 11:27AM

I checked the 1970 parts catalog and couldn't find GM PN 4477679 listed?
Am I missing it somewhere?

Thanks,

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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Re: More Interesting Trivia! confused smiley
Posted by: MtnVairMike ()
Date: April 03, 2018 11:46AM

Dale,

I have a 65 Assembly Manual and couldn't find a reference yet.
Does anyone have a link to download a 66 ASM pdf file?

Thanks,

Mike

1966 Monza Convertible, 140HP-4 speed, Ermine White

Others in the menagerie...
72 Corvette Stingray, 58K miles, owned since 86
72 MGB, 112K miles, bought from original owner in 09
78 Chevy pickup, 124K miles, bought new in 78
93 Corvette, LT1/6spd, 210K miles, daily driver since 96

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Re: More Interesting Trivia! confused smiley
Posted by: MattNall ()
Date: April 03, 2018 12:02PM

Mike, in our FAQ's





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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