Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
Silly question - crossover pipe
Why is the crossover pipe designed like it is with flexi joins and not a solid pipe.
I can understand cats to exhaust pipes / manifolds etc as they are from a fixed engine to a body mounted system.
Isn't the crossover pipe from one fixed point on the engine to another the other side with no movement.
I'm probably understanding it wrong but what purpose has the flexi sections in this particular application.
Rich
4th Jul 2022 12:16 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13657
Hi
Wonder if it’s due to vibration as it’s bolted onto the engine and gearbox or maybe expansion / contraction, or maybe as u accelerate and engine moves by having the flexable joints prevents the pipe from fracturing, of course all guesses but someone with more knowledge should be able help more than myself
See u can get them in stainless steel
Last edited by gstuart on 4th Jul 2022 12:37 pm. Edited 1 time in total
4th Jul 2022 12:20 pm
Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
They look nice as well.
Just wondering thou if it was just a solid pipe and some sort of bung or damper on the bracket to absorb vibration if that's the reason.
They must have had problems testing and came up with the current design as a solution unless it's just over engineered based on assumption.
4th Jul 2022 12:34 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13657
Also wonder if maybe as u accelerate the engine moves so by having the flexible joints prevents the pipe / joints from fracturing ??
Alas just guessing here , lol,
Indeed they look really nice , apologises forgot the link , don’t have any dealings with the company
Did also read somewhere that if the gearbox ever has to come out theres a bracket on the crossover pipe and if this isn’t done back up I assume that makes the situation even worse by allowing the crossover pipe to move even more and maybe leading onto the joints / pipe cracking
Fingers crossed u don’t have to replace urs or has it already been diagnosed as the issue
Last edited by gstuart on 4th Jul 2022 12:46 pm. Edited 1 time in total
4th Jul 2022 12:40 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Thermal expansion. The crossover pipe may well be bolted to two 'fixed' point, but the reality is these two points move in relation to each other. If the cross over were rigid, like a cast pipe, it'd crack in the first thermal cycle!Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
4th Jul 2022 12:46 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 13657
Hi Richard
Many thks as did wonder if it was expansion and contraction, see what u mean by the brackets to secure it
Also read somewhere if the gearbox has to come out that some forgot to bolt it back to the gearbox therefore allowing more movement of the crossover pipe leading to fracturing due to excessive movement
Thks again for the knowledge
4th Jul 2022 12:49 pm
Doughboy
Member Since: 04 Aug 2020
Location: Tamworth
Posts: 90
Ah OK that makes sense.
There must be a fair degree of it to have needed two flex sections as well I guess.
Mines not diagnosed but it's heading that way.
4th Jul 2022 12:53 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Yes, if the brackets aren't bolted on, there will be harmonic vibrations in the pipe, which will also lead to stress fractures. There will have been a lot of work done in development to cure issues of cracking in the pipe.
Shame they didn't put some of that effort into the crank failures as well! Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
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