danny_dub
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Registered: 12th Dec 09
Location: Fareham, Hampshire
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Some of you may have read my thread yesterday about what happened to my flexi pipe.
Told my old man about it and he hasn't got a clue what a flexi pipe is used for. He knows quite a bit about cars etc but has never come across 1. His argumnet is that if the exhaust is fitted correctly etc there should be no movement in it. The only thing he can think of is that if theres play in the engine mounts and the engine moves when its reved up.
Can someone shed some light on this please
Cheers
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Mertin
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Registered: 12th Oct 05
Location: Scotland
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The engine does move when revved, changing gear etc. The manifold will move with the engine and transferring movement to the exhaust. Also the exhaust is "hung" on rubber hangers so theres some movement there aswell
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Mertin
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Registered: 12th Oct 05
Location: Scotland
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quote:
Originally posted by Mertin
The engine does move when revved, changing gear etc. The manifold will move with the engine and transferring movement to the exhaust. Also the exhaust is "hung" on rubber hangers so theres some movement there aswell
Hasnt quite alot of cars have a piece of flexi pipe in the exhaust? I know iv seen a few, vectra b and astra mk4 gsi off the top of my head. Surely if he knows a bit about cars he'll know flexi pipes are used in exhsust systems? Usually near the down pipe / cat i think
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danny_dub
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Registered: 12th Dec 09
Location: Fareham, Hampshire
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dont get me wrong hes no mechanic! We have a 205 which has no flexi or his diesel A4. Hes had old escort mexicos etc which didnt have them either
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3CorsaMeal
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Registered: 11th Apr 02
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I have always seen them as a bodge and never understood why you would want one.
I have never needed one.
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Rich H
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Registered: 26th Oct 05
Location: West Sussex Drives: E46 M3
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TBH, it's a Powerflow exhaust - 'customised' to fit any car using generic exhaust components. IE. Bodged to fit. Therefore things like flexipipe are used.
OEM exhausts designed to fit the car don't have it, neither do decent customised exhausts (in general)
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Graham88
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Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
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My downpipe comes with a flexpipe, simply because there is so much movement in the exhaust.
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AlexW
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Registered: 25th Oct 08
Location: Essex
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All corsa's have a flexi, It just isn't a bit of pipe like your thinking of, Its two flanges, with a cone gasket mesh and then the bolts with springs.
Lots of cars have it like the above. Exhausts are rubber mounted, but a bit of extra flex in the exhaust isn't a bad thing.
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Mattb
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Registered: 2nd Feb 03
Location: Under your sisters bed
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Plenty of cars have flex joints - it hardly a bodge!! 
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3CorsaMeal
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Registered: 11th Apr 02
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i honestly don't know, but everytime i see them, they usually a pic of someone who has just fitted one to their car
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Jake
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Registered: 24th Jan 05
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is it this stuff you are on about?
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Mattb
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Registered: 2nd Feb 03
Location: Under your sisters bed
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more along the lines of..
Golf/a3 2.0 tdi
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Jake
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Registered: 24th Jan 05
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Cars
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3CorsaMeal
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Registered: 11th Apr 02
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be really funny to find out the corrado has one now 
i would totally change my mind about them
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Jake
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Registered: 24th Jan 05
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corrados have the mesh ting like mattb posted
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3CorsaMeal
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Registered: 11th Apr 02
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thats the sort i was talking about, you are joking me?
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Jake
Member
Registered: 24th Jan 05
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nope. the stuff i linked first is the pikey flexi pipe
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Rich H
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Registered: 26th Oct 05
Location: West Sussex Drives: E46 M3
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quote:
Originally posted by Mattb
more along the lines of..
[img]http://www.kat-company.com/shop/media/catalog/product/cache/3/image/5e06319eda06f020e43594a9c230972d/3/0/30210-h_1.jpg[img]
Golf/a3 2.0 tdi
I was barking up the wrong tree  
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Mike
Organiser: North West and North Wales
Premium Member
Registered: 20th May 06
Location: nr. Skipton, North Yorkshire
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quote:
Originally posted by danny_dub
The only thing he can think of is that if theres play in the engine mounts and the engine moves when its reved up.
That's exactly why, engine mounts aren't solid, they're designed to have movement in them otherwise you'd have a running engine vibrating through the whole shell which wouldn't be pleasant. Fitting a solid exhaust would just cause damage to the joints as they tried to take up the movement
[Edited on 23-06-2011 by Mike B]
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Phillips_91
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Registered: 20th Jan 10
Location: Blackpool. Drives: Sapphire Black Mk4 Astra 1.8
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90% of vehicles have a flex of some sort, wether it be the 'mesh' flexi above or a spring kit. It's not a bodge, they come out of the factory like that
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smcGSI16V
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Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
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yep, Vectra v6's have them.
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taylorboosh
Member
Registered: 3rd Apr 07
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loads have flexis, my vectra gsi had a standard exhaust
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gavin18787
Premium Member
Registered: 22nd Feb 05
Location: Basildon, Essex
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My aftermarket mani has felxi on the end of it. Have to fit stiffer aftermarket mounts to the engine too though to avoid buggering it up with excess movement
Drives supercharged Tec with torque  
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Toby
Premium Member
Registered: 29th Nov 05
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It's not down to how poorly the exhaust is made, is down to how much the manufacture can compensate for other variables. The ST without a updated gearbox bush means the engine moves about 20mm underload, Ford produce the flexi to help with this. Miltek have also added a flexi section to my manifold so that just compounds the point about shit aftermarket exhausts
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ed
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Registered: 10th Sep 03
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The engine is on rubber mounts. It moves. Steel fatigues. You need a flexi pipe.
Not sure what the story is with solid mounts though.
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