Nissan 370Z Forum - View Single Post - MOTORDYNE ART Pipes

ronn1 · 12-21-2011, 08:23 PM

Quote:

Originally Posted by Arnold K.

RED RTV sealant works just fine.

I also have a set of Berk gaskets (from their resonated test pipes) that I was given. I'll be using them in conjunction with RTV once my flex sections are replaced next week finally.

I was thinking of doing the same thing..RTV plus Gasket. I'm also planning of replacing the flex sections with beefier ones I just purchased.

Here it is..read *description* portion..interesting.

Anatomy of a Flex Pipe

A flex pipe is made up of a variety of components. These components may vary somewhat from manufacturer to manufacturer, but typically are made up of steel accordion type bellows. These bellows are often covered with a braided steel reinforcement, which prevents the flex from stretching too far and protects it from damage. Some will also contain an inner braided steel covering or a solid, floating insert, which functions to reduce exhaust turbulence. The ends of the flex usually have a solid steel shield, which joins the braided covering and reinforces the connection to the exhaust pipe. In the case of replacement flexes, they may or may not have pipe extensions which allow it to be easily welded or clamped into and existing exhaust system. The flex pipes are rated by diameter and length from end to end, not including pipe extensions. Pipe extensions are approximately 2" long, adding approximately 4" to the total length on the unit.

Differences in Flex Pipes

Flex pipes can be made from a variety of different materials and can also differ in their construction techniques. Some companies use ordinary steel, which can rust and corrode and/or may use aluminized steel (ordinary steel with an aluminum-based coating). These materials typically do not last very long as compared to stainless steel. Additionally, many companies will crimp the fittings together, which allows water to become trapped in the crimped joint, encouraging corrosion. Some flex bellows are formed as a continuous helix, which can create exhaust turbulence and, in general, indicates that poor construction techniques are used. Some companies have a loose braid pattern on the outer and inner coverings, which allows the flex to stretch too far, causing premature failure. There can also be variations in the gauge of materials, as well as the exact type of materials that are used, which has a significant influence on the price and longevity of the joint as a whole.

Bear River Flex Pipes

We do not compromise on our flex pipes, which are made entirely of stainless steel. We use 304 stainless to form the non-helical bellows as well as the braided reinforcements. We use a tightly woven braid pattern for greater strength. Most of our flex joints also have an inner braid and are built from heavy gauge materials to last for as long as possible. We believe that you want the best product for your money and that is why we do not offer second rate products.

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