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Avin Luther
DieHard
vic
Soarer uzz31 Limited

Posts: 723
Reg: 07-2005

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Tuesday, February 14, 2006 - 02:05 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i have a twin exhaust like most on here, however the exhaust gas on one side is much hotter than the other....

Any ideas why?
Anton Jones
Tinkerer
QLD
JZZ30

Posts: 58
Reg: 08-2005

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Tuesday, February 14, 2006 - 02:22 pm, by:  Anton Jones (Alj) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Without burning yourself, is is the same at the exhaust manifold?

The exhaust will naturally choose the shortest path out and on exhaust is always a little shorter than the other...
Cihan Aday
DieHard
Victoria
JZZ30

Posts: 535
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Tuesday, February 14, 2006 - 02:28 pm, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Gases will chose the path of least restriction, if there is a blockage in one of the mufflers or cats etc, that whole section of the exhaust pipe will presurise to a point and exhaust gasses will push out of the unblocked side.

A quick way to check for blocked mufflers is using a laser pointer! A night, shine the laser into the exhaust and you can see everything thats happening.. The gas lights up nicely, so you can check if one side is breathing better than the other without waiting for a cold morning!

Goodluck mate,
Cihan.
Avin Luther
DieHard
vic
Soarer uzz31 Limited

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Reg: 07-2005

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Tuesday, February 14, 2006 - 02:29 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

couldnt tell on the manifold.
I am wondering if there is anything in either bank of the engine that would cause excess heat on one side in comparison to the other, eg more unburnt fuel etc...
both sides have strong smell and carbon build up
Avin Luther
DieHard
vic
Soarer uzz31 Limited

Posts: 725
Reg: 07-2005

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Tuesday, February 14, 2006 - 02:33 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i had the mufflers off the other day, gas comes out both sides, i managed to get a lenght of hose up the same distance on both sides (as far as the start of the resonators) no blockage down there. cats have "no blockage"
Cihan Aday
DieHard
Victoria
JZZ30

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Tuesday, February 14, 2006 - 02:40 pm, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

In that case, it is most likely an unburnt fuel scenario.
Leaky injector/s or weak spark to a cylinder.
If its idling fine etc, id think its an injector issue lifting the EGT of one bank up.

Regarding the cat. converter, sometimes the honeycomb weave gets squashed up and becomes a partially solid block of metal.. has happened on my friends lowered commodore.
Dave Hart
TryHard
Waikato
UZZ32

Posts: 304
Reg: 08-2005

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Tuesday, February 14, 2006 - 02:47 pm, by:  Dave Hart (Davyboy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

One cat more blocked than the other so it comes down to path of least resistance.
If you want to be sure try and get a heat gun (buy/hire/borrow) and point it at the exhaust from each cylinder. Shouldn't be too much difference between them if all's working as it should.
Avin Luther
DieHard
vic
Soarer uzz31 Limited

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Tuesday, February 14, 2006 - 02:57 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I will check spark plugs for build up.
I probably should get new leads. its running fine though.
Whats EGT Cihan? and how would i remedy this injector issue?
I have always had above average fuel consumption.
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 3274
Reg: 11-2004

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Tuesday, February 14, 2006 - 04:01 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Is it a stock exhaust system?

If so, the exhaust from both manifolds mingles after the cats at the centre resonator and then goes out through the twin pipes to the rear.

That eliminates being able to determine if one bank of cylinders is acting strangely and also eliminates the cats for this particular issue.

If the exhaust system has been modified and is straight through with no balance pipe etc, it could be anything to do with one bank.

You could probably try to feel along the pipes to find out where the temperature change occurs.
Avin Luther
DieHard
vic
Soarer uzz31 Limited

Posts: 728
Reg: 07-2005

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Tuesday, February 14, 2006 - 04:11 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

headers
twin 2.25
X pipe
resonators
cannons
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 3275
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Tuesday, February 14, 2006 - 04:29 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

So it all mixes at the X-pipe. Theoretically the problem (if it is one) is happening after that. If one bank was running hot, the mixing at the X-pipe would mean the same stuff still goes out both pipes at the rear.
Avin Luther
DieHard
vic
Soarer uzz31 Limited

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Reg: 07-2005

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Tuesday, February 14, 2006 - 04:33 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hmmmm, to what extent would it mix though. not much past the x pipe!
would a chunk of cat broken off and lodged in the resonators make a big difference?
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8

Posts: 3276
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Tuesday, February 14, 2006 - 04:49 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Avin, depending of the design of the X-pipe, possibly a hot right hand bank could cause a hot left hand exhaust. Probably feeling along the pipe will give you the best clue.
Neil Griffiths
Trader
NSW
I have MORE Soarers than Hayden :-)

Posts: 1459
Reg: 07-2005

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Tuesday, February 14, 2006 - 05:51 pm, by:  Neil Griffiths (Aussiesc) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Easy solution..Just dont touch the pipe !!! hahaha

It might just be nature...As the pipes DO join at one section..
Lew Radbourn
Trader
Queensland
jzz30 / uzz30/ uzz31

Posts: 544
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Tuesday, February 14, 2006 - 07:23 pm, by:  Lew Radbourn (Marlew) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

AVin;
if there is a piece of cat in there it will rattle a bit.
with the X pipe in there it is very hard to determine what bank of the engine is running hotter than the other
so now you have repaired the cats and then comes the X pipe and if you have not noticed any rattle of lack of power any more since fixing the cats then don't worry mate
Avin Luther
DieHard
vic
Soarer uzz31 Limited

Posts: 732
Reg: 07-2005

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Tuesday, February 14, 2006 - 10:05 pm, by:  Avin Luther (Lex_luther) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

the rattling has well and truly gone,
I did have a piece of the old cat lodged pretty tight in one bit just before the muffler. hard enough to not make any noise. A tap with a screw driver broke it to pieces and it then blew out once i started her up.

So if it pulls a decent figure on the dyno then dont wory about it?

cheers guys
Lew Radbourn
Trader
Queensland
jzz30 / uzz30/ uzz31

Posts: 547
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Tuesday, February 14, 2006 - 10:09 pm, by:  Lew Radbourn (Marlew) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

thats about it mate!
Cihan Aday
DieHard
Victoria
JZZ30

Posts: 539
Reg: 07-2005

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Wednesday, February 15, 2006 - 12:43 am, by:  Cihan Aday (Cihan) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Avin Luther wrote on Tuesday, February 14, 2006 - 02:57 pm:

I will check spark plugs for build up.
I probably should get new leads. its running fine though.
Whats EGT Cihan? and how would i remedy this injector issue?
I have always had above average fuel consumption.



Sorry mate, EGT stands for exhaust gas temperature. It rises unnaturally if unburnt fuel passes through when the exhaust valves open, it also rises with ignition retard.

**
Probably bits of cat. converter lodged in the resonator restricting one side a little as suggested. U'll find out on dyno day i suppose :-)

Cheers,
Cihan.

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