Extractor exhaust

1Seedy65
Posts: 7
Joined: Sat Nov 08, 2014 6:38 pm

Extractor exhaust

Post by 1Seedy65 »

Alright I tried to search this site for discussion with those words and didn't find anything. I'm just wondering what all is believed about that somebody asked about air cleaners and I know ram the clean air in and then it has to come out....just wondering about performance improvements, etcetera with the different engine horsepower and induction systems. :think:
1Seedy65
Posts: 7
Joined: Sat Nov 08, 2014 6:38 pm

Re: Extractor exhaust

Post by 1Seedy65 »

They're probably pretty ugly on a Corvair classic and maybe not enough ground clearance maybe in the dune buggy thread someone may have touched on it...as the engine is hanging out there and anything is possible.
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bbodie52
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Re: Extractor exhaust

Post by bbodie52 »

:welcome2: :wave: Welcome to the Corvair Forum!

If you don't own a copy of this book, I would strongly suggest that you buy a copy and read it to help you with your Corvair upgrades and improvement investments. I have owned the earlier version of this book since 1970, and bought the updated version when it was published last year. It is filled with a great deal of informative material that has been developed and collected over decades of Corvair ownership and racing. At $20.80 it is a good Corvair "bible" that will help you to make educated, informed decisions for your Corvair before you actually spend time and money.

:link: http://www.amazon.com/Performance-Corva ... th+emerson

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Corvair headers can be difficult to seal properly against the exhaust tubes if they are not properly designed. There are also issues of practicality on the street, with excessive noise, poor ground clearance, the need to eliminate or cut the lower shrouds, etc. And the cast exhaust manifolds may not be pretty, but they aren't really excessively restrictive for the small displacement of the 164 CI engine either. The actual power gains realized by installing tubular headers on a street engine would likely be negligible.

My personal preference is the trombone style marketed by Clark's, but some of their stock-style units may be a little more quiet. Here is a reprint of some comments regarding Corvair exhaust system options...
bbodie52 wrote: :think: If you want tubular headers and mufflers for use in a car and on the street, Clark's Corvair Parts sells them. They require cutting the lower engine shrouds or removal of the lower sheet metal, but will fit within the confines of the Corvair body.

Good options for the street are also covered below. A review with good comments about all three possibilities can be found at the bottom.

:omgosh: :assault: :assault: Tubular Headers
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=38

:eek: :assault: :assault: Trombone-Style Exhaust Extractors
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=37

:tongue: :assault: :assault: Standard Dual Exhaust
:link: http://www.corvair.com/user-cgi/catalog ... IN&page=35

For a fair assessment and evaluation of the different exhaust system options for use in a Corvair, from a stock dual configuration to the trombone-style mufflers to full tubular headers, see the comments below...
terribleted wrote:Posts: 842
Location: Atlanta, GA

I have personally used the Ultimate exhaust, both type of exhaust extractors, and stock dual, and single systems.

The Ultimate exhaust header system is loud to me even with the baffles installed. The drone at certain speeds can be annoying and can be unpleasant for extended operation. Cutting or removing the lower shrouds can cause the windshield defroster to fog the windshield due to the extra moisture let in to the manifold area (not a problem until you need the windshield defogged on a warm rainy day). For best longevity I recommend ceramic coating the system prior to installation. I would not use these again myself except on a race car. (very slight performance difference noted from stock dual exhaust with a basically stock motor).

The Exhaust Extractor systems and pretty nice all in all. The large tip one is loud. I got tired of this after a while and ultimately replaced it with the straight small tip version. I really like the note of these and they are not so loud as to be annoying. This system is not without its issues however. The pipes must be bracketed to the engine or engine sheet metal near the front ahead of the first muffler as well as at the rear on both sides or drooping will likely occur. The connection at the manifold even though it seems very strong will allow the system to rotate and droop without help. Another issue is that the welded bracket that holds the extractor pipes parallel to each other in roughly the center bottom of each extractor is prone to coming loose after a period of time. I have re-welded a number of both small tip and large tip systems for this issue. The final issue is a small one. On the small systems I have installed the pipes do not stick out from under the rear grille the same amount on both sides, one side is shorter. (it is somewhat normal that they may not be spaced right to left evenly when viewed from the rear). These also should be ceramic coated for durability. No noted performance gain compared to stock duals but sounds and looks cooler.

The replacement stock type systems from Clark's are excellent. When installed with new brackets and hardware these are the most durable exhausts I have used on a Vair. No trouble or maintenance for 30,000 miles or more over 4+ years, something I can not say about the above systems based on my use of them. The complete dual system they sell with the larger tips is my choice in these. Ceramic coating not really needed for good durability but it will keep them looking good and stave off rust longer. I think there is a slight performance gain going to a dual exhaust system from a single.

Corvair guy since 1982. I have personally restored at least 20 Vairs, many of them restored ground up. See my work or contact me at: https://www.facebook.com/tedsautorestoration
:link: http://www.corvair.com/user-cgi/catalog ... ow_page=37
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:link: http://www.corvair.com/user-cgi/catalog ... ow_page=38
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Brad Bodie
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1Seedy65
Posts: 7
Joined: Sat Nov 08, 2014 6:38 pm

Re: Extractor exhaust

Post by 1Seedy65 »

Yeah...wow thanks for all the great information. I paid the guy for the Corsa today and the engine turns over by hand. That's standard lingo I know I used a socket wrench...got to get it home now and have a key made for the ignition so I'm a ways away from ordering exhaust parts but not too far away cuz it needs it.
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