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Old 03-16-2012, 11:23 AM
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Exhaust layout help needed with flex tube

Am laying out my SS exhaust under my 51 Chevy P/u. Engine is SBC w/TPI.
My primary question is where to locate the flex tube, if I use them at all?

The flex tubes are SS like these.

I think they can best go just before the "X" section as seen here




I am using V-Band joint clamps and plan on using these at muffler intake (Muffler is in fromt of rear axle just out of view in the above picture) and one where pipe goes up over rear axle to allow easier removal.


Comments and suggestions appreciated. I only want to do this job once.

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Old 03-16-2012, 04:41 PM
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Quote:
Originally Posted by Tireman9
Am laying out my SS exhaust under my 51 Chevy P/u. Engine is SBC w/TPI.
My primary question is where to locate the flex tube, if I use them at all?

The flex tubes are SS like these.

I think they can best go just before the "X" section as seen here




I am using V-Band joint clamps and plan on using these at muffler intake (Muffler is in fromt of rear axle just out of view in the above picture) and one where pipe goes up over rear axle to allow easier removal.


Comments and suggestions appreciated. I only want to do this job once.
Ayuh,.... If ya use 'em,....

consider puttin' 'em on the Other End of those pipes, up nearer the headers....

Those long pipes can be anchored with the rest of the system, 'n the motor can do it's Flexin' at the ends of the headers....
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Old 03-16-2012, 04:44 PM
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Why do you feel you need to use those things?.....
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Old 03-16-2012, 08:43 PM
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I like flex tubes. They take the vibrations out of the exhaust and helps the seals fit better.

I would put them closer to the headers.
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Old 03-17-2012, 09:47 AM
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Thanks for replies.
My primary thought on the flex tubes was for reduction of vibration.
I also thought that unlike straight back exhaust (no X or H) the expansion of the exhaust system due to heat was not a simple straight line but could put some side loading on the joints between header and the X unit.

Think I will shorten the straight sections of the pipes just behind the header in the picture to move the X section forward and to give me a place to put the flex tubes just behind the bend off the collector joint. This left over pipe will then allow me to complete the run to the X section (where I have the flex tube in the picture. Just have to measure and cut accurately.

I do plan on welding all the pipe in front of the mufflers (pretty much everything in the picture) into a single unit. The truck will be a driver with long term reliability a focus as I definately want to do the entire RT66 thing and then coordinate that drive West with a Power Tour trip back to Ohio maybe 2013 if I get my butt in gear on the project.

Nice to have a goal.
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Old 03-17-2012, 06:10 PM
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If I were to use them I also would put them close to the engine/manifolds/headers.
I wouldnt use them in this instance as they really arent needed.
Also they are convoluted inside and will disturb the exhaust pulses or "waves" if you will, which actually could hurt performance(a little)
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Old 03-17-2012, 07:27 PM
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i wouldn't use them. i've only seen them used on front wheel drive systems.
we use them on turbo installs and then only on front wheel turbos.

never needed them on a rear wheel drive. they are costly and restrictive.
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