fao peeps who do 2.0 conversions concerning the exhaust - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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corsa120

Member

Registered: 4th May 02
Location: Northamptonshire
User status: Offline

1st Apr 04 at 21:19

after the 2.0 is fitted can the exhaust you already have still be used

corsafreak

Member

Registered: 1st Dec 03
Location: --- NorthEast ---2.0 16v powered
User status: Offline

1st Apr 04 at 21:27

mine is and runs fine on the original 1.4i exhaust (1.75" bore),however it's only a temporary measure for me.
i've been told 2.25-2.5 " system are best, biggest being noisier though

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

1st Apr 04 at 21:33

made my own exhaust, 3inch bore all the way down to the backbox, then goes to 4inch exit. need a big bore

corsafreak

Member

Registered: 1st Dec 03
Location: --- NorthEast ---2.0 16v powered
User status: Offline

1st Apr 04 at 21:46

aye you have a turbo though mine would'nt have the ability to shoot squirrels out of a 3 incher unlike yours

littletriad

Member

Registered: 22nd Jun 03
Location: Oldbury, West Midlands
User status: Offline

1st Apr 04 at 23:14

use 2 or 2.25 but no more or u loose power

sfxer

Member

Registered: 23rd Aug 00
Location: devon, england
User status: Offline

2nd Apr 04 at 10:19

2 will be fine, littletriad is right about losing power

stuyw

Member

Registered: 15th May 02
Location: North West Drives: Rev3 MR2 Turbo
User status: Offline

2nd Apr 04 at 14:36

ive got 2 1/4" on mine n is about right m8

Daimo B

Member

Registered: 20th Mar 00
User status: Offline

2nd Apr 04 at 16:09

Straight thru 2" system into two 44mm pipes into two 6x4s

corsa120

Member

Registered: 4th May 02
Location: Northamptonshire
User status: Offline

2nd Apr 04 at 18:02

i think i should re-word the question what i mean is........

i currently have a jap powerflow system, but im swopping for a piper full stainless zorst, my question is when i have the 2.0 fitted do u need a new exhaust/cat to suit the manifold on the 2.0 engine or do you need a new custom system made up

Fad

Member

Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
User status: Offline

2nd Apr 04 at 18:31

just mated up my magnex full systm and decat not sure what size bore but its hige thinking 2.5"

also sounds the nuts not raspy just real deep and throaty

stuyw

Member

Registered: 15th May 02
Location: North West Drives: Rev3 MR2 Turbo
User status: Offline

2nd Apr 04 at 18:58

u'll have to get a replacement as the front pipe of the astra bends the other way. If u wanna keep ur existing zorst, u will have to cut it, turn it round and weld it to the astra front pipe

Daimo B

Member

Registered: 20th Mar 00
User status: Offline

2nd Apr 04 at 19:07

Well mine didn't need a cat so i had the flange cut off then the system mated onto that.

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

2nd Apr 04 at 19:21

quote:
Originally posted by littletriad
use 2 or 2.25 but no more or u loose power

i dont have that problem

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

3rd Apr 04 at 13:49

quote:
Originally posted by littletriad
use 2 or 2.25 but no more or u loose power

so if your bore is bigger than that, your engine performs worse?

that assclowns guide needs sending via mail to you i think

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

3rd Apr 04 at 13:51

quote:
Originally posted by sfxer
2 will be fine, littletriad is right about losing power

no bigger bore exhaust get rid of exhaust gases, the smaller the bore, the more air creeps back up the manifold FACT!

TOMAS

Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline

4th Apr 04 at 10:13

BACK PRESSURE - word.

Mattb

Member

Registered: 2nd Feb 03
Location: Under your sisters bed
User status: Offline

4th Apr 04 at 10:22

^^^^ yep, perfect size for the Let is apparently 2.5 inches,
start getting bigger and you start loosing back pressure. i dont know how it works mind you, but if you exhaust has a hole in it you loose power, tis the same with a larger bore.

if you get me.....

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

4th Apr 04 at 11:15

quote:
Originally posted by TOMAS
BACK PRESSURE - word.

air taking easier routes - another 4 words

TOMAS

Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline

4th Apr 04 at 16:31

yeah well dont fit an exhaust, or manifold for that matter. That has to be the easiest route

Andy

Member

Registered: 28th Dec 99
Location: Cumbria, UK
User status: Offline

4th Apr 04 at 17:37

Using a bore that is too big for engine power loses you low down and mid torque. It's complicated to explain, but it's to with the waveforms of the pulses of the gases leaving the engine. With the right bore size, you can create a negative pressure that helps sucks the exhaust gases away. Too wide a bore and you lose this effect. Too narrow and the resistance to air flow starts to become a problem. For 160bhp engine about 2 inch bore is ideal. 200bhp engine about 2.25 - 2.5 inch bore is ideal.

[Edited on 04-04-2004 by Andy]

WARPED

Member

Registered: 12th Jun 02
Location: Stoke + Wolves - Corsa Sport
User status: Offline

4th Apr 04 at 18:25

/\ agreed - too big bore - loss of back pressure - loss of low/mid power /\

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

4th Apr 04 at 18:30

i think in a physics kinda why, i imagined air coming out the exhaust from and it made more sense for the air to go with flow rather than against flow if u get me

Dave

Member

Registered: 26th Feb 01
Location: Lancs
User status: Offline

4th Apr 04 at 19:01

It's a fair complicated science, as Andy said there is loads more involved than just gasses escaping. It gets really complicated on 2strokes where they have specific expansion chambers to engineer in a certain amount of back pressure because of the way they expell exhaust gas. I can't see it being a massive deal in a road car though.

I've noticed on mine since the 2litre went its almost as though gas is struggling to get out at idle, I'm considering losing the twin exit and going for something more simple, it was only really for looks anyway.

J da Silva

Member

Registered: 10th Apr 03
Location: The FACTory
User status: Offline

4th Apr 04 at 19:06

well i took the old 2inch bore of coz it was spluttering and struggling, made my own 3inch and now its all cured and increased 3bhp

, not much but its not a loss

Dave

Member

Registered: 26th Feb 01
Location: Lancs
User status: Offline

4th Apr 04 at 19:17

Mine splutters about at idle, think it'smore to do with gas coming back out of a box it only just went into, then having to mess about going round wheel well and out of another pipe.

Also sounds awful, raspy at low revs and spits black water out of the second pipe.

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