[C2] Crossover Pipe Installed
Drifting
Joined: May 2013
Posts: 1,989
Likes: 455
From: Texas
I wonder, does the wrap work almost as well as the insulated foil in terms of lowering the temperature?
And is there any benefit to wrapping almost all of the side exhausts just below the manifold and all the way to the end of the straight mufflers? You can assume it would reduce the overall temperature around the pipes, especially if in traffic...would it also change the sound of the pipes? Not sure it's worth doing.
And is there any benefit to wrapping almost all of the side exhausts just below the manifold and all the way to the end of the straight mufflers? You can assume it would reduce the overall temperature around the pipes, especially if in traffic...would it also change the sound of the pipes? Not sure it's worth doing.
Steve
Safety Car
Joined: Jan 2004
Posts: 4,270
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From: Macedonia Ohio
Nice set up. I am interested in what you had to do in re-tuning. Did that make a difference? I added an X pipe on my 65 and did not retune. However, I have Holey fuel injection. The tuner said it would self tune.
Safety Car
Joined: Mar 2009
Posts: 4,191
Likes: 951
From: Corpus Christi, TX
Very nicely done crossover. They really do make a seat of the pants noticeable difference in how the car runs.
Just curious whether the X pipe on the under car system sounds raspy. Therea a late model camaro and a late model mustang in the neighborhood, both have X pipes and both seriously get on my nerves.. lol. They sound ugly.
Just curious whether the X pipe on the under car system sounds raspy. Therea a late model camaro and a late model mustang in the neighborhood, both have X pipes and both seriously get on my nerves.. lol. They sound ugly.
Thread Starter
Pro
Joined: Jul 2018
Posts: 612
Likes: 69
From: Illinois
The engine wasn't perfectly tuned very well to begin with, so it made sense to fine tune after the x-over was installed. That included timing, fuel/air and float levels. All I know it runs/sounds 100% better now with more HP, but I believe it was due to a combination of adding the x-over and tuning.
I was also informed (by my mechanic) having the x-over pipe closer to the engine helps the lower RPMs while installing it further away benefits the higher rpms in terms of HP. Not a lot of HP, just a little bit more. Not sure if anyone else has ever heard this.
By the way, everything took a week because he wanted to make sure the cold start/idle was correct. Old school mechanics who own classic cars themselves is who you want to do this sort of thing. They respect and appreciate these vehicles and treat them almost like their own. There is no substitute for years of experience.
Thread Starter
Pro
Joined: Jul 2018
Posts: 612
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From: Illinois
Very nicely done crossover. They really do make a seat of the pants noticeable difference in how the car runs.
Just curious whether the X pipe on the under car system sounds raspy. Therea a late model camaro and a late model mustang in the neighborhood, both have X pipes and both seriously get on my nerves.. lol. They sound ugly.
Just curious whether the X pipe on the under car system sounds raspy. Therea a late model camaro and a late model mustang in the neighborhood, both have X pipes and both seriously get on my nerves.. lol. They sound ugly.
Although my neighbors may not be too happy about it, I don't gun it until I'm down the street, lol.
Instructor
Joined: Oct 2008
Posts: 209
Likes: 3
I have been wanting to do a cross over pipe for my '67 300HP with side exhaust for some time and really like the look of the one posted by Black Tux since the cross over is behind the bell housing and low enough to mitigate a radiant heat problem problem. Insulating it sufficiently with wrap should prevent too much heat to the tranny. I am wondering if there is any negative effect on performance or fuel mileage.
Bob
Bob
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Thread Starter
Pro
Joined: Jul 2018
Posts: 612
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From: Illinois
I'm going to guess there is a slight difference in sound but not enough to be apparent unless you listened very hard and able to compare both side by side.
Thread Starter
Pro
Joined: Jul 2018
Posts: 612
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From: Illinois
I have been wanting to do a cross over pipe for my '67 300HP with side exhaust for some time and really like the look of the one posted by Black Tux since the cross over is behind the bell housing and low enough to mitigate a radiant heat problem problem. Insulating it sufficiently with wrap should prevent too much heat to the tranny. I am wondering if there is any negative effect on performance or fuel mileage.
Bob
Bob
Safety Car
Joined: Mar 2002
Posts: 3,780
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From: Southwest MI
Well, in my mind, all changes from original configuration need to be assessed; kind of a cost/liability versus advantages gained analysis. I’m an original configuration/period correct guy so anything that deviates from that, especially something visible like this, is a significant hit on the liability side to begin with, that, plus the cost $, additional heat to the oil(pan) or transmission and floorboard/interior of the car (one of the big advantages of the side mounted exhaust… getting all that heat away from the drivetrain and interior of the car)…….. and what are the perceived positives/gains exactly? What I’m hearing is it will make the car sound different than a sidepipe midyear (is that an advantage ?), and did I read significant power gaines? (anybody have any numbers?).
Last edited by 66427-450; Aug 21, 2021 at 05:14 PM.
Safety Car
Joined: Mar 2002
Posts: 3,780
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From: Southwest MI
One would think a flange connection would be a necessity, as you said, can always take it in for rework/addition.
Thread Starter
Pro
Joined: Jul 2018
Posts: 612
Likes: 69
From: Illinois
Well, in my mind, all changes from original configuration need to be assessed; kind of a cost/liability versus advantages gained analysis. I’m an original configuration/period correct guy so anything that deviates from that, especially something visible like this, is a significant hit on the liability side to begin with, that, plus the cost $, additional heat to the oil(pan) or transmission and floorboard/interior of the car (one of the big advantages of the side mounted exhaust… getting all that heat away from the drivetrain and interior of the car)…….. and what are the perceived positives/gains exactly? What I’m hearing is it it will make the car sound different than a sidepipe midyear (is that an advantage ?), and did I read significant power gaines? (anybody have any numbers?).
The second concern I'm hearing is around originality and tampering with the original configuration. It's simply adding an exhaust pipe between 2 other pipes and can be removed and patched in minutes. I don't live by all the NCRS rules 24 x 7 x 365, so shame on me.
I don't think anybody said "significant power gains" were achieved strictly from adding a x-over pipe. Not sure where you're getting this notion.
Safety Car
Joined: Mar 2002
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From: Southwest MI
Thread Starter
Pro
Joined: Jul 2018
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From: Illinois
Last edited by jsans; Aug 21, 2021 at 06:00 PM.
Safety Car
Joined: Mar 2009
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From: Corpus Christi, TX
Sorry for the confusion. I meant PaulUptime's car, which has what's known as an X pipe crossover. OP, yours, and the other side pipe cars, have whats known as an H pipe crossover, or at least a close approximation. I have an H pipe on my under car exhaust, its a bolt in kit from Summit and is assembled from two opposed T pipes with a connector between them. H pipes don't usually sound raspy, which seems to be your experience as well. I was wondering what Paul's car sounds like with that big X on it.
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From: St. Louis MO
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Burning Brakes
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From: Kyle, Texas
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Your H Pipe
Sorry for the confusion. I meant PaulUptime's car, which has what's known as an X pipe crossover. OP, yours, and the other side pipe cars, have whats known as an H pipe crossover, or at least a close approximation. I have an H pipe on my under car exhaust, its a bolt in kit from Summit and is assembled from two opposed T pipes with a connector between them. H pipes don't usually sound raspy, which seems to be your experience as well. I was wondering what Paul's car sounds like with that big X on it.
Race Director
Joined: Nov 2003
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From: Cottonwood AZ
C1 of Year Finalist (performance mods) 2019
There were putting cross over pipes on Corvettes from the factory since 1957. The purpose was to balance the exhaust flow on the dual exhaust. It does make a difference in the sound of the exhaust since you are balancing the output from the two cylinder heads. It also does give a slight performance gain but I am not sure if it is noticeable in the seat of your pants.
Last edited by 68hemi; Aug 23, 2021 at 12:08 AM.
Melting Slicks
Joined: Feb 2006
Posts: 3,044
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From: Toronto ON
Sorry for the confusion. I meant PaulUptime's car, which has what's known as an X pipe crossover. OP, yours, and the other side pipe cars, have whats known as an H pipe crossover, or at least a close approximation. I have an H pipe on my under car exhaust, its a bolt in kit from Summit and is assembled from two opposed T pipes with a connector between them. H pipes don't usually sound raspy, which seems to be your experience as well. I was wondering what Paul's car sounds like with that big X on it.
I never recorded videos of the sound with my previous exhaust setup (but that was with the 454 in my car when I got it.) Here's one with the 350 Edelbrock Performer engine I run now, getting tuned under load at a dyno shop. An A/F sensor was installed into the header and the carb set up over about a dozen dyno pulls.. Since then I have done ignition (MSD 6AL w/MSC Tach-drive distributor) and improved the wires and plugs. Despite this being in a dyno room I think it does the sound some justice.