Exhaust dumps
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,363
Likes: 0
From: Canton Ohio
Exhaust dumps
I was thinking of fabricating some exhaust dumps on my current exhaust set up. Basically for when I go to the track this summer until I get hooker side pipes. Has anyone made these on their own vette? Any pics or advice? How hard would they to fabricate from an existing system?
Thanks
Dan
Thanks
Dan
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Hey Danboback, I just had a set of 3" dumps made for my car. I think they were $30 for the pair. I can get some pics for you if you like.
I am going to try them at the track this weekend along with 2 other exhaust systems.
I am going to try them at the track this weekend along with 2 other exhaust systems.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,363
Likes: 0
From: Canton Ohio
I would love to see any pics that you have a the set up. This is really going to be my first self fabrication product, I figured I might as well do it on something I am going to replace anyway! Where did you get the dumps at?
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,363
Likes: 0
From: Canton Ohio
In an almost related topic, is it possible to screw up your valves by not having enough back pressure? Some guy told me that if I put the dumps to close to the manifolds that it will cause a suction of air into the heads and screw up the valves. Does anyone know if there is any truth to these comments?
Thanks
Thanks
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
The lack of backpressure will have no effect on the exhaust valves, what they are referring to is when the exhaust valve is cooled too fast by something like a draft up the exhaust when the motor is shut down. One thing you can do is get something to put in the dump when the motor is shut down to keep that draft out.
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
I just recently saw a 69 small block vette with electric cutouts on it. Those would be ideal for your dumps. Just flip a switch and you are "race ready".
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Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,363
Likes: 0
From: Canton Ohio
I have seen those myself, a little bit expensive at $180. Maybe if I was planning on keeping the undercar set up for a while. But within the next two years I am planning on getting Hooker side exit headers and side pipes.
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Originally Posted by danboback
In an almost related topic, is it possible to screw up your valves by not having enough back pressure? Some guy told me that if I put the dumps to close to the manifolds that it will cause a suction of air into the heads and screw up the valves. Does anyone know if there is any truth to these comments?
Thanks
Thanks
C6 the C5 of tomorrow
Joined: Nov 2000
Posts: 6,665
Likes: 2
From: Twin Cities Minnesota
I have cutouts right behind the front wheels. The sidepipes make a 90 degree turn there.
I made a nice chrome cover and have three bolts holding it on.
The side cover is cut back to uncover the cutout.
It works great, they come off in about 2 minutes...
I made a nice chrome cover and have three bolts holding it on.
The side cover is cut back to uncover the cutout.
It works great, they come off in about 2 minutes...
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,363
Likes: 0
From: Canton Ohio
Originally Posted by 427V8
I have cutouts right behind the front wheels. The sidepipes make a 90 degree turn there.
I made a nice chrome cover and have three bolts holding it on.
The side cover is cut back to uncover the cutout.
It works great, they come off in about 2 minutes...
I made a nice chrome cover and have three bolts holding it on.
The side cover is cut back to uncover the cutout.
It works great, they come off in about 2 minutes...
C6 the C5 of tomorrow
Joined: Nov 2000
Posts: 6,665
Likes: 2
From: Twin Cities Minnesota
Originally Posted by danboback
I would really like to see a pic of that if I could!!
I forgot to mention the best parts;
1. no crawing under the car to open them up.
2. At car shows if you rev the engine it will blow a skirt up....
The burnt paint is from welding, not from the cutouts
Last edited by 427V8; Apr 15, 2005 at 01:21 PM.
Burning Brakes
Joined: Jun 2004
Posts: 1,012
Likes: 5
From: Granbury, TX
I have headers that connect to my stock Y-pipe. I had a cut out welded in front of the rear axle. The exhaust dumping under the car was rattling my brain so I had the muffler shop weld up an extension to route the exhaust out from under the left side of the car. I call it my "NASCAR PIPE". Now I can cap the cut out- really quiet, run with the NASACAR pipe -loud, or run open- really loud. Since these pictures, I built a sheet metal baffle for the inside of the pipe which cuts down on the "raspiness".
Cut Out
NASACAR Pipe
Cut Out
NASACAR Pipe
