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Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Bobdudeman ()
Date: December 08, 2017 04:33AM

I was thinking about moving the outer tins off of the Corvair around the motor. I understand that there's the top and bottom ones around the cylinder are good for cooling but was looking to possibly have an open engine compartment. I have seen that online and a couple situations and wonder if that was okay or not. I plan on having my engine compartment well vented. Thanks for all the input, Steve

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: jjohnsonjo ()
Date: December 08, 2017 04:49AM

Removing the bottom is OK, the top ones keep the fan from recirculating the hot air coming out of the bottom. In racing, it may not matter as much since you are always moving. To me rear hood scoops make more since.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Bobdudeman ()
Date: December 08, 2017 04:50AM

This is what I was suggesting.

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: vairmech ()
Date: December 08, 2017 04:51AM

I generally don't put the surround tins on the engine and I haven't had any issues with cooling on the race track. You do have a little more debris able to get in there and you need to keep your air filters clean.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Spectre ()
Date: December 08, 2017 05:15AM

I always thought the side tins had more to do with keeping exhaust fumes from being pulled into the heating system than cooling.

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: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Bobdudeman ()
Date: December 08, 2017 05:23AM

This will be mostly a race prepared car that will occasionally be driven on the street.

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: cnicol ()
Date: December 08, 2017 06:53AM

Given the 1800 CFM fan drawing cool outside air from above, the area above the perimeter shroud stays pretty close to ambient temperature.

With the perimeter shroud removed, the fan will draw air from below which includes the heat off the exhaust system and airflow coming out of the 350F cylinder heads.

It's probable that most of the time, the engine compartment area would be hotter with the perimeter shrouds off and it's certain the engine itself would run hotter. The only exception would be during actual high speed where the slipstream may scavenge the area.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: gnvair ()
Date: December 08, 2017 07:05AM

Have to agree, the upper pieces are to avoid recirculating hot air back into the engine. From a performance stand point you would gain more power from having a steady supply of cool air going in than recirculating hot air.
Besides the fact that when the cars were new (meaning all seals in place and no rust holes) the stock fan actually creates pressure that pulls air in through the air inlets. There was enough pressure to pull air through an a/c condenser which tells me that the amount pressure is substantial.
Removing the seal, the upper shrouds is not something I would do. Its not like they way that much so I am not sure what is to be gained by leaving them off.

Lee J

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: davemotohead ()
Date: December 08, 2017 07:42AM

I will be leaving them in place on my race car and all my street cars for the reasons Lee stated and to keep crap out of the engine compartment.





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

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Bobdudeman ()
Date: December 08, 2017 07:51AM

Excellent information guys I really appreciate it. I will be keeping them in.

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Wagon Master ()
Date: December 08, 2017 08:23AM

Doesn't matter to some but you must really like to clean. This is an engine I did with about 4 years of summer driving on it. Once a year in the spring with a Windex rag and you're good. This is one of the ONLY area where I'm a stickler to keep it the way the General designed it.



'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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Re: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: Spectre ()
Date: December 08, 2017 09:55AM

You also have to figure that GM was always trying to cut costs anywhere they could. If that side tin wasn;t needed, they would not have gone through the expense of producing it.

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: Venting engine compartment by removing sheet metal or engine shrouds
Posted by: corventure Dave ()
Date: December 08, 2017 10:59AM

I have personal experience with driving on the street with the engine side tin's removed, 40+ years ago when I was young and careless. The engine ran much hotter. Also experienced vapor lock and detonation-ping. This was summer driving. Reinstalling the tins eliminated the issues.

Corventure Dave

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