tomgregory2000
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| posted on 29/3/09 at 08:10 PM |
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Exhaust routing question
I was wondering if anybody has routed the exhaust under the car down the trans tunnel below the prop?
I am thinking of having rear exit exhaust rather than side exit.
My only worry is that the exhaust will be right next to the fuel line, would this be a problem? i would heat wrap the exhaust.
I think westfield do it on their v8 powered cars.
Tommy
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omega0684
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| posted on 29/3/09 at 08:15 PM |
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quote:
Originally posted by tomgregory2000
My only worry is that the exhaust will be right next to the fuel line, would this be a problem?
Tommy
SVA/IVA Fail im affraid 
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MakeEverything
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| posted on 29/3/09 at 08:17 PM |
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A question that i asked myself a few weeks ago, but where would you put the silencer? - Under the fuel tank?? - Er... i dont think i would.
I thought about it, and even thought about compartmentalising the trans tunnel to take fuel etc separately from the prop and exhaust, but the dangers
of having the muffler under (or over) the fuel tank carrys considerable risk, particularly in the event of a rupture following rear-ending. Thats the
biggest hazard that i saw. That and melting the seats next to the trans tunnel!
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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blakep82
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| posted on 29/3/09 at 08:32 PM |
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why would it fail sva/iva?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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tomgregory2000
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| posted on 29/3/09 at 08:32 PM |
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quote:
Originally posted by MakeEverything
A question that i asked myself a few weeks ago, but where would you put the silencer? - Under the fuel tank?? - Er... i dont think i would.
I thought about it, and even thought about compartmentalising the trans tunnel to take fuel etc separately from the prop and exhaust, but the dangers
of having the muffler under (or over) the fuel tank carrys considerable risk, particularly in the event of a rupture following rear-ending. Thats the
biggest hazard that i saw. That and melting the seats next to the trans tunnel!
My seat has the silincer next to the fuel tank and the parents cars do as well,my motorbike has the the fuel tank ontop of the the engine
This is after sva as i have my retest on thurs, im already moding my car in my head and its not on the road yet 
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MakeEverything
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| posted on 29/3/09 at 08:48 PM |
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quote:
Originally posted by tomgregory2000
quote:
Originally posted by MakeEverything
A question that i asked myself a few weeks ago, but where would you put the silencer? - Under the fuel tank?? - Er... i dont think i would.
I thought about it, and even thought about compartmentalising the trans tunnel to take fuel etc separately from the prop and exhaust, but the dangers
of having the muffler under (or over) the fuel tank carrys considerable risk, particularly in the event of a rupture following rear-ending. Thats the
biggest hazard that i saw. That and melting the seats next to the trans tunnel!
My seat has the silincer next to the fuel tank and the parents cars do as well,my motorbike has the the fuel tank ontop of the the engine
Fair comment, but the Seat, and parents cars have crumple zones and impact protection. Also, they have Bumpers and more substantial metal protecting
the tank.
A locost has Fk all between the tank and the incoming car.
The bike, well, if a car is in a position to be able to hit the tank on a bike, youre dead anyway, oron your arse about 10 metres away sliging towards
the armco or kerb.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MakeEverything
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| posted on 29/3/09 at 08:50 PM |
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Theres also a reson that factory cars have exhausts NEXT TO the tank and not under it.
Heat rises....
Also, the slightest leak would be catastrophic.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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maximill666
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| posted on 29/3/09 at 08:51 PM |
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BigRich has done it on his car & it looks like a very nice job too 
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omega0684
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| posted on 29/3/09 at 09:00 PM |
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quote:
Originally posted by blakep82
why would it fail sva/iva?
The fuel system-Particular attention will be paid to the positioning of components to minimise fire risk. Every component must be securely fitted,
made of suitable materials, protected as
appropriate from corrosion and heat.
Components should not be positioned close to exhaust manifolds and pipes, in a way that could pose a fire hazard in the case of an accident
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blakep82
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| posted on 29/3/09 at 10:24 PM |
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^ ah i see, but if you had a fuel pipe down one side of the tunnel, and the exhaust down the other side, with the fuel pipe lower than the exhaust,
should be alright shouldn't it?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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omega0684
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| posted on 29/3/09 at 10:32 PM |
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personally IMHO if i was an SVA inspector i would fail it, most tunnels are less than 4" across and you say that you could put the fuel lines
below the exhaust but the tunnel is a closed unit in some cars and even if you had the bottom open all the fibreglass would become very hot in the
cockpit. what if you role the car in an accident and the fuel line breaks in the tunnel for whatever reason you would have fuel pouring out onto a red
hot exhaust (NO THANKS!) IMHO its just toooo risky, i certainly wouldn't do it, remember you are more than likely going to have to run brake
lines and wiring through the tunnel as well, as soon as i read the post the first thought in my head was
THIS IS A BAD IDEA! just my 2p's worth but i think its the right way of thinking and the safest.
another thing that has just popped into my head is, how are you going to position the exhaust aroung the gearbox, i don't know about your car
but i only have a couple of inches either side of my box, no space for an exhaust in there.
[Edited on 29/3/09 by omega0684]
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Steve Hignett
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| posted on 29/3/09 at 10:50 PM |
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Description
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blakep82
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| posted on 29/3/09 at 10:56 PM |
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quote:
Originally posted by omega0684
personally IMHO if i was an SVA inspector i would fail it, most tunnels are less than 4" across and you say that you could put the fuel lines
below the exhaust but the tunnel is a closed unit in some cars and even if you had the bottom open all the fibreglass would become very hot in the
cockpit. what if you role the car in an accident and the fuel line breaks in the tunnel for whatever reason you would have fuel pouring out onto a red
hot exhaust (NO THANKS!) IMHO its just toooo risky, i certainly wouldn't do it, remember you are more than likely going to have to run brake
lines and wiring through the tunnel as well, as soon as i read the post the first thought in my head was
THIS IS A BAD IDEA! just my 2p's worth but i think its the right way of thinking and the safest.
another thing that has just popped into my head is, how are you going to position the exhaust aroung the gearbox, i don't know about your car
but i only have a couple of inches either side of my box, no space for an exhaust in there.
[Edited on 29/3/09 by omega0684]
but isn't that how production cars are? ok, so some will run under the floor rather than in the tunnel, but its the same idea. we drive around
with up to 60 litres of explosives in cars all the time, my BMW has the fuel tank under the rear seats, and the exhaust runs under that.
I don't know, as long as everything's secure and components are fit for the job, i don't think running an exhaust through there is a
problem.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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omega0684
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| posted on 29/3/09 at 11:53 PM |
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quote:
but isn't that how production cars are?
i cant speak for everyone here, but my corsa's fuel lines run down the right side of the car on its undercarridge and the exhaust runs off
centre towards the left of the car, at least three feet away, not 3 inches like in a tunnel. you will find on the base of a lot of production cars
there is a heat shield on the base of the fuel tank to prevent heat affecting the tank.
quote:
ok, so some will run under the floor rather than in the tunnel
why would you run the exhaust under the car and compromise ground clearence, the lowest part of my drivetrain is the bell housing on the gearbox which
4.5" of the road service. and the actual floor is 5". if you are running a 2" diameter pipe under the car you would have to leave at
least an inch between the bottom of the car and the exhaust + the diameter of the pipe so you are looking at a ground clearence of a maximum 2".
just not practical in my eyes. and then you have the diameter of the silencer to take into account, mine is 6" in diameter and would never fit
under the car!
quote:
as long as everything's secure and components are fit for the job, i don't think running an exhaust through there is a
problem
IMHO i think that the secuity of the fuel system is obviously important and i believe that the SVA inspectors believe this also, but more importantly
they are there to make sure that the cars are SAFE to go on the road. i think that once the SVA inspector is happy that the fuel lines are secure his
attention would be more prominant on fuel line routing hence the ruling in the SVA manual
quote:
Components should not be positioned close to exhaust manifolds and pipes, in a way that could pose a fire hazard in the case of an
accident
i just think that unless you could massively reduce the amount of heat in the tunnel from the exhaust it just simply wouldn't be safe to do so.
Considering that the prop pretty much goes down the middle of the tunnel and having fuel lines on one side, brake lines on the other and wiring on a
top chassis rail, i would say that there is simply not enough room in the tunnel to run the exhaust either
taken me ages to write all that, but this is just my opinion. might be BS to someone else but thats for them to decide. i find that when i am checking
over peoples car with them i try to put myself in the eyes of an SVA inspector, you just have to be anal about everything!
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piddy
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| posted on 30/3/09 at 09:29 AM |
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Why do you want to route the exhaust under the car?
As you say They do it on Westfield’s,. So try and find someone that will let you look at how the are done and copy that method. How much ground
clearance have you got?
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MakeEverything
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| posted on 17/5/09 at 08:15 AM |
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Ive just got the dutton, and the pipe on it runs under the car on one side. When you look under the car, it is quite clear what would be the first
thing to be ripped off at the first speed hump. It breaks the line of the underside of the car, and takes away some ground clearance.
I wouldnt route it with fuel lines at all.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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Badger_McLetcher
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| posted on 17/5/09 at 10:09 AM |
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Would it not be possible to route the fuel line(s) down the side of the cabin? (suitably shielded). That way it gives you a bit more room to route the
exhaust.
If disfunction is a function, then I must be some kind of genius.
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MakeEverything
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| posted on 17/5/09 at 09:07 PM |
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quote:
Originally posted by Badger_McLetcher
Would it not be possible to route the fuel line(s) down the side of the cabin? (suitably shielded). That way it gives you a bit more room to route the
exhaust.
I think the IVA prohibits this?
I know the tank isnt permitted in the passenger compartment.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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nz_climber
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| posted on 17/5/09 at 09:09 PM |
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If you want a rear exit exhaust, then run the exhaust exactly the same as a side exit, have the muffler where is should be, then run the tip of the
exhaust out the back instead of the side. (under the axle) Thats what one of the kit manufactures do down here, makes it alot quieter for people in
the car.
http://aarons7.wordpress.com
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