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Author: Subject: To Flex Or Not To Flex?
the_big_1

posted on 29/5/19 at 09:28 PM Reply With Quote
To Flex Or Not To Flex?

Hi guys,

Do you guys use flex joints on your exhaust systems?
The flex pipe type that wire mesh etc or a different type or none at Ll and let the rubber mounts do the flexing?

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steve m

posted on 30/5/19 at 06:36 AM Reply With Quote
No, and yes it has broke on the bottom of the manifold,
I now have a braceing bar that goes from the block to the bottom of the manifold/exhaust were it exits the car, just so if the manifold did break again, the exhaust will still be held to the car at the front and back

steve





Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at




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CosKev3

posted on 30/5/19 at 08:19 AM Reply With Quote
I didn't with my bike engine as the engine was solid mounted .

But now on my car engine I've used them,even though its mounted on pretty stiff poly mounts.

If you are running standard rubber car engine mounts I would deffo use them.

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nick205

posted on 30/5/19 at 08:28 AM Reply With Quote
I built an MK Indy 2.0 Pinto and used an MK supplied full exhaust system. No flexi-joint(s) used and in over 3,000 miles no issues at all, nothing broke on it. After the silencer section it was secured to the car with a rubber bobbin on a steel bracket. Again no issues or beakage.
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40inches

posted on 30/5/19 at 08:28 AM Reply With Quote
I used Trulock flexy either side of the silencers Linky
It works out a lot cheaper than flexy connectors, is compact and can be twisted to fit the pipe tightly, so can be clamped on directly

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chillis

posted on 30/5/19 at 10:19 AM Reply With Quote
This will depend to some degree as to what engine you have and how much it moves on its mounts when in use. Engines can move a lot under hard acceleration.
Older cars used to mount solidly to the manifold then suspend the system from two or three rubber hangers so the system could move with the engine.
I have mounted the exhaust solid to the chassis and connected to the manifold with some stainless flexi, seems to work ok.
Just make sure the engine is not being held rigid by the exhaust.





Never under estimate the ingenuity of an idiot!

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