Exhaust bore size

Dean1985 · Nov 17th, 2015, 08:32

Hi guys,

What size is the bore of the exhaust where the joint is behind the OS rear wheel. The joint I beginning to blow and is very corroded.

Thanks Dean

Antz · Nov 17th, 2015, 09:10

Im guessing on a T4? I think its 2.5"

Dean1985 · Nov 17th, 2015, 09:28

Your guess would be correct. Cheers

Antz · Nov 17th, 2015, 11:13

Pretty sure its 2.5". When I had a cat-back system made for my T4 he used 2.5" stainless. I think 2.25" would be a tad too small.

Alex121 · Nov 17th, 2015, 14:31

T4's have a 2.5" bore

kieran40 · Nov 17th, 2015, 14:50

What do diesels have it's quite a big pipe, and I'm suprised you t4 boys don't use it lets more gasses out as it's bigger also it would sound nicer more gasses escaping

Alex121 · Nov 17th, 2015, 16:41

I'd be surprised if the diesel has a bigger bore tbh as back pressure is the most important thing on high pressure turbo charged engines, therefore exhaust systems need a lot of research into keeping the them happy.

I need to get a downpipe and race cat sorted to help with exhaust manifold temps on mine as I'm pretty much at the limit now.

kieran40 · Nov 17th, 2015, 16:59

It's quite a big bore Alex throughout the system what it is I don't know mate

960kg · Nov 18th, 2015, 18:36

Isn`t the outside diameter 67mm for the T4??

dmiller · Nov 25th, 2015, 21:30

Hey Dean,

How did you fix it? Mines the same (although not a T4) and its gone at the flange, with the flange rusted away so it wont hold.

I've tried a few exhaust places but they want to replace the whole lot saying they cant fix it - seems excessive to me?

I was thinking of maybe grinding the flange off and using some sort of patch to hold them together unless anyone has any better ideas?

It happened the day after it passed its MOT thankfully!

David.

Nov 17th, 2015, 08:32	#1
Dean1985 Master Member Last Online: Jun 4th, 2021 20:51 Join Date: Aug 2009 Location: Norwich	Exhaust bore size Hi guys, What size is the bore of the exhaust where the joint is behind the OS rear wheel. The joint I beginning to blow and is very corroded. Thanks Dean __________________ 2001 V40 T4 S Auto on 177k 98 V40 T4 SE auto now retired @ 176k.

Nov 17th, 2015, 09:10	#2
Antz No I'm not the redhead Last Online: Nov 25th, 2022 09:49 Join Date: Jun 2009 Location: North Yorkshire Coast	Im guessing on a T4? I think its 2.5" __________________ 1988 Volvo 240 GLT T5 Swap a T5 motor into your RWD Volvo:The Guide

Nov 17th, 2015, 09:28	#3
Dean1985 Master Member Last Online: Jun 4th, 2021 20:51 Join Date: Aug 2009 Location: Norwich	Your guess would be correct. Cheers __________________ 2001 V40 T4 S Auto on 177k 98 V40 T4 SE auto now retired @ 176k.

Nov 17th, 2015, 11:13	#4
Antz No I'm not the redhead Last Online: Nov 25th, 2022 09:49 Join Date: Jun 2009 Location: North Yorkshire Coast	Pretty sure its 2.5". When I had a cat-back system made for my T4 he used 2.5" stainless. I think 2.25" would be a tad too small. __________________ 1988 Volvo 240 GLT T5 Swap a T5 motor into your RWD Volvo:The Guide

Nov 18th, 2015, 18:36	#9
960kg Premier Member Last Online: Dec 28th, 2022 12:25 Join Date: Jun 2009 Location: Mercville	Isn`t the outside diameter 67mm for the T4?? __________________ Mercedes C320CDI Sport Estate 3 litre V6 7 Gear Auto Remap 290bhp 628Nm torque @ 1600revs 45.1mpg

Nov 17th, 2015, 14:31	#5
Alex121 Premier Member Last Online: Oct 27th, 2020 10:45 Join Date: Nov 2011 Location: -	T4's have a 2.5" bore

Nov 17th, 2015, 14:50	#6
kieran40 I've Been Banned Last Online: Mar 4th, 2023 12:36 Join Date: Aug 2013 Location: paignton	What do diesels have it's quite a big pipe, and I'm suprised you t4 boys don't use it lets more gasses out as it's bigger also it would sound nicer more gasses escaping

Nov 17th, 2015, 16:41	#7
Alex121 Premier Member Last Online: Oct 27th, 2020 10:45 Join Date: Nov 2011 Location: -	I'd be surprised if the diesel has a bigger bore tbh as back pressure is the most important thing on high pressure turbo charged engines, therefore exhaust systems need a lot of research into keeping the them happy. I need to get a downpipe and race cat sorted to help with exhaust manifold temps on mine as I'm pretty much at the limit now.

Nov 17th, 2015, 16:59	#8
kieran40 I've Been Banned Last Online: Mar 4th, 2023 12:36 Join Date: Aug 2013 Location: paignton	It's quite a big bore Alex throughout the system what it is I don't know mate

Nov 25th, 2015, 21:30	#10
dmiller Senior Member Last Online: Jan 11th, 2023 22:53 Join Date: Oct 2013 Location: Near Glasgow.	Hey Dean, How did you fix it? Mines the same (although not a T4) and its gone at the flange, with the flange rusted away so it wont hold. I've tried a few exhaust places but they want to replace the whole lot saying they cant fix it - seems excessive to me? I was thinking of maybe grinding the flange off and using some sort of patch to hold them together unless anyone has any better ideas? It happened the day after it passed its MOT thankfully! David. __________________

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