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Old 02-14-2011, 09:25 AM
Young Gun
 
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Exhaust Question

Searched and searched......couldn't find my answer.

I'm about to start running a custom exhaust setup on my 67 Riviera.

I've welded up some custom adapters to jump straight to 2.5" out of the stock manifolds.

My question is.....where would be best to put the braided flex adapters?

Should I install them right after the manifold.....kind of like a "down pipe"?

or should I make my bend back to "level" first and then install my flexes?

Thanks!!!

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Old 02-14-2011, 09:28 AM
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If everything is fastened properly you shouldn't have any braided flex pipe.
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Old 02-14-2011, 09:31 AM
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I've always read that to prevent the system from kinking or tweaking when the engine revs.....to install them. I know on every car I've owned as well...they're always there.

Should I just invest in a flexible hanger system instead so everything moves together?

If so....that's gonna be an awesome money saver for the "Budget Build Buick"
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Old 02-14-2011, 03:37 PM
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Hi,

Suggest avoiding the flex. It is used in certain apps like FWD where engine torque made it a requirement for design. If your motor mounts are good, and the system is assembled OK, then "you're good to go."

I would recommend a "cross over" pipe as part of your design. It helps flow between banks (gets a bit of scavenge effect).

Also, I learned a trick that I'll pass on to you.... A little 'HI TEMP" RTV on the exhaust manifold donuts to hold them in place (just a little) will make sure they don't leak.

Cheers,
Matt
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Old 02-14-2011, 03:47 PM
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Quote:
Originally Posted by S2X01
Searched and searched......couldn't find my answer.

I'm about to start running a custom exhaust setup on my 67 Riviera.

I've welded up some custom adapters to jump straight to 2.5" out of the stock manifolds.

My question is.....where would be best to put the braided flex adapters?

Should I install them right after the manifold.....kind of like a "down pipe"?

or should I make my bend back to "level" first and then install my flexes?

Thanks!!!
The flex connectors are there to disconnect the movements of the engine from the exhaust system hanging on rubber mounts. On today's vehicles being usually shorter and the use of lighter weight exhaust tube breakage of the pipes became a big deal. Older, longer with heavier gauge pipe don't tend to exhibit that problem so much as the length puts some spring distance in the pipes and the thicker wall material is more resistant to fatigue from movement.

All that said, flex joints will require more maintenance than other parts of the system, so you want then where it's easy to get at them for replacement. For the Riviera I'd bring the head pipes down and use an H style cross over between the tranny oil pan and the torque converter cover. That whole assembly will move with the exhaust manifolds and the engine. Then put the flex connectors between there and the first pipe lengths supported on hangers. It's a good idea to use clamps on them rather than welding.

Bogie
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