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FC Cooling System Musings
Posted by: monza66mo ()
Date: November 15, 2017 06:08PM

I've been reading that some of you prefer to block off the fresh air intake to improve the flow of air downward by eliminating the possibility of evacuating air upward via the intake. It makes sense. My Loadside has the block off plates.

What I'm not understanding is the temperature of the air supply. In a closed engine compartment, with the fresh air intake blocked, the air supply to the cooling fan is going to be hot air. Right?

Would scoops on the sides of my FC over the fender slots cause the air supply to the top shroud to be cooler and have more velocity thus improving the flow? Scoops catching the air would push it inward and against any flow the fan might push out.

Is the fresh air intake really that passive? Doesn't the fan pull the air in and push it down? (instead of back out the intake?)

- Art in Missouri
'61 Loadside

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Re: FC Cooling System Musings
Posted by: MattNall ()
Date: November 15, 2017 06:16PM

Last Statement is correct...

Fan SUCKS air from anywhere it can get it and it goes down and out the bottom....

When running... air ABOVE the fan shroud is ambient air... the block offs are for Cold weather driving...carb icing!

Air along the sides is basically stagnant... low pressure... Scoops need to hang out 6-8" to really be effective.

Better would be a duct at the front of the cab that just feeds the Engine compartment... then you would have the "Ram-Air" effect...

Several FC / Ultra owners have just installed the HD '61-3 fan....when hauling heavy loads....


Biggest reported problem here has been the insulation in the side ducts comes a part and blocks them.





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: FC Cooling System Musings
Posted by: monza66mo ()
Date: November 15, 2017 06:31PM

MattNall Wrote:
-------------------------------------------------------
Scoops need to hang out 6-8" to really be effective.
>
> Biggest reported problem here has been the insulation in the side ducts comes a part and blocks them.

6" deep scoops look goofy in my imagination. I can't see me doing that on this truck.

I don't have an assembly manual for this truck yet but I didn't realize there was insulation in or near the air intake back there inside the bed walls. If there is and it's rotted, seems like a good fix would be to just eliminate it. What's it insulating?

- Art in Missouri
'61 Loadside

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Re: FC Cooling System Musings
Posted by: Pedigo ()
Date: November 15, 2017 06:44PM

Art. It's the only way to roll. So much,infact,I roll them on my '61 Loadside.
Girls dig em.drinking smiley

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Re: FC Cooling System Musings
Posted by: SteveInMarietta ()
Date: November 15, 2017 06:48PM

My understanding that this serves as sound insulation. As a purist, I always replace it, making sure the replacement will remain in place for another 50 years.
Steve

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Re: FC Cooling System Musings
Posted by: MattNall ()
Date: November 15, 2017 06:49PM

monza66mo Wrote:
-------------------------------------------------------
> What's it insulating?


Noise!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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..............................110-PG.................................................Webered-Turbo

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Re: FC Cooling System Musings
Posted by: American Mel ()
Date: November 15, 2017 07:25PM

Having never had an FC, I have no first-hand experience, but I do recall reading (probably on here), that unless they are as large as Matt says, side scoops actually restrict airflow at anything less than upper freeway speeds.
Any "Long-Term Hot Summer" users of FC side scoops want to chime-in?

.
-----------------------------------------------
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: FC Cooling System Musings
Posted by: monza66mo ()
Date: November 15, 2017 07:40PM

"Girls dig 'em" Lol!

I think I've talked myself into removing the block off plates and adding the fresh air intake after I peek inside to see the condition of the insulation.

(but no scoops for me).

- Art in Missouri
'61 Loadside

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Re: FC Cooling System Musings
Posted by: MattNall ()
Date: November 15, 2017 08:09PM

monza66mo Wrote:
-------------------------------------------------------

> I think I've talked myself into removing the block
> off plates and adding the fresh air intake
=======================================================

What's this fresh air intake?


And leave the Plates on until Spring.... or doesn't it get cold in Missery? ggg





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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..............................110-PG.................................................Webered-Turbo

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Re: FC Cooling System Musings
Posted by: davemotohead ()
Date: November 15, 2017 08:58PM

smoking smiley





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)




Sign my guest book!
[motoheadmall.com]
-----------------------------------
Rust Free Lancaster Ca

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Re: FC Cooling System Musings
Posted by: Timothy Shortle ()
Date: November 15, 2017 09:42PM

I thought insulation was only used on the passenger wagon FCs (Greenbriers).

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Re: FC Cooling System Musings
Date: November 15, 2017 10:10PM

It has generally been assumed that side scoops not only do not work but can actually make cooling worse because of air turbulence.
The Corvair design draws all the air it needs - This only becomes an issue if the insulation has collapsed or there's some other blockage.

Lon wall
1964 Greenbriar daily driven

Lon Wall

Fireman Sumpter Valley Railroad #3 and #19
svry.com
www.pacificmodelloggerscongress.com

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Re: FC Cooling System Musings
Posted by: monza66mo ()
Date: November 16, 2017 03:31AM

MattNall Wrote:
> And leave the Plates on until Spring.... or doesn't it get cold in Missery?

Oh, it gets plenty cold here but the chances of icing my carbs are pretty low because I won't take the Loadside out again when its "that" cold. The other day when it was a balmy 29 degrees out, I drove it to work and the icing of the driver was enough that performance was severely limited. sad smiley

- Art in Missouri
'61 Loadside

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Re: FC Cooling System Musings
Posted by: vairmech ()
Date: November 16, 2017 04:53AM

Ah ha! Carb icing generally occurs from under 40 degrees to about 32 degrees and with high moisture in the air.

The block off plates are not really block OFF plates but rather air diverter plates. It keeps the cold incoming air off the carbs so they don't get the direct air from the outside on them.

It hurts nothing to leave the plates on year around. As has been mentioned the inner SOUND insulation can come off and block the inner air passage. You can reach up and feel it but very hard to see.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: FC Cooling System Musings
Posted by: isucorvair ()
Date: November 16, 2017 06:36AM

Is FC Cooling an issue?

My '61 Rampside gets driven quite a bit. Its a 4 speed, with a '68 95hp in it. No scoops, everything else is 'stock'.

It regularly gets driven 70 miles round trip to work / back. I use it to haul (heavy enough loads to bottom out the rear suspension).

Never seem to get hot - no vapor locking, etc.


Eric P.
DeWItt, IA

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Re: FC Cooling System Musings
Posted by: monza66mo ()
Date: November 16, 2017 07:08AM

isucorvair Wrote:
-------------------------------------------------------
> Is FC Cooling an issue?

I'm not having any cooling "problems" with my truck. I'm just curious about the benefits of the block-offs. Before I try to find the correct fresh air intake parts, I need to justify the effort and expense to myself.

- Art in Missouri
'61 Loadside

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Re: FC Cooling System Musings
Posted by: Vern in Bend ()
Date: November 16, 2017 07:14AM

Timothy is right - only the vans have the sound insulation in the sides that comes loose and blocks the cooling air flow.

The pickups don't have it, there is no reason for it.

Regards, Vern

Bend, Oregon

'64 Corvan, daily driver - 42 years
'64 Rampside, personal driver - 24 years
'67 Monza Cpe, original owner - 33k miles
'80 Vanagon, converting to Corvair power, "VanaVair"
'81 Vanagon high-top panel van

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Re: FC Cooling System Musings
Posted by: davemotohead ()
Date: November 16, 2017 07:26AM

I don't run the scoops to make it run cooler I run the scoops because they are cooler! smoking smiley





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)




Sign my guest book!
[motoheadmall.com]
-----------------------------------
Rust Free Lancaster Ca

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Re: FC Cooling System Musings
Posted by: corventure Dave ()
Date: November 16, 2017 07:47AM

There was an article in the CORSA Communique a few years back on the wind tunnel tests Chevrolet did on Corvair FC's. The air intake's are specifically positioned for maximum air flow at I believe it said 48+ mph. Air hitting the flat front of the FC at speed bounced around and hit the rear fender precisely where the intakes are.
So adding the scoops could potentially obstruct cooling air flow at speed.

I have never had a cooling issue with my Greenbrier. Even when driving in the desert in summer. I did remove the triangular shaped air diverter plates in the engine compartment, to have more direct and maximum air flow to the fan.

Even here in So. Calif. we have winter mornings that get down to freezing for an hour or so. I have experienced carburetor icing a couple times. These plates could have helped by diverting air around the carburetors in that condition.

Corventure Dave

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Re: FC Cooling System Musings
Posted by: ac1948 ()
Date: November 16, 2017 08:34AM

Here you go Matt.

Jerry Murray
Charleston, SC

66 Monza Conv.,110,PG

63 Rampside, PG,110

64 Monza Coupe, 110, 4 speed

64 Rampside, 110, 4 speed

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