Hammy360
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| posted on 2/3/11 at 09:53 PM |
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Carbs, IVA and CATS
excuse my utter ignorance but I have a year 2000 zetec and am looking at some carbs for sale so will they work and pass IVA as I believe I need a CAT
etc for IVA, Very very confused ............
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blakep82
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| posted on 2/3/11 at 10:02 PM |
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you will need a cat to get through emissions, but it can be done with carbs yes
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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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big_wasa
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| posted on 2/3/11 at 10:05 PM |
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I say NO. You will not be able to get them to meet emissions this opinion was backed up By Bogg Brothers when they did some work for me a few years
ago.
It comes down to if you can tune them to meet and still keep it drivable and for that reason I say NO.
[Edited on 2/3/11 by big_wasa]
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blakep82
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| posted on 2/3/11 at 10:11 PM |
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quote:
Originally posted by big_wasa
I say NO. You will not be able to get them to meet emissions this opinion was backed up By Bogg Brothers when they did some work for me a few years
ago.
It comes down to if you can tune them to meet and still keep it drivable and for that reason I say NO.
[Edited on 2/3/11 by big_wasa]
loads of people on here have, and still are building cars with bike carbs and getting them through IVA, so why not?
and don't scare me, coz i'm still building mine on bike carbs lol
________________________
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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cliftyhanger
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| posted on 2/3/11 at 10:15 PM |
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The carbs would have to be incedibly accurately, otherwise the cat will soon die. Not sure how the MoT man will pass the lambda test too if there
isn't one fitted?
However, if you can get the carbs set up very very well, then no reason why the exhaust gasses won't be clean enough for the cat. Just remember
the cat can't sort out really pants exhaust gasses for any length of time. Injection would be a much better bet........
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austin man
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| posted on 2/3/11 at 10:29 PM |
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doesnt the cat sometimes fall off immediately after and then magically reappears at test time
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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big_wasa
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| posted on 2/3/11 at 10:30 PM |
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I still say no as you will not be able to tune the carbs to meet the emmisions over the rev range needed. I could get carbs to pass on mine as its a
pre 95 engine.
Show me ONE person that has passed Iva running a blacktop zetec with an age related number on carbs and I will say I am wrong.
I dont think I will have to 
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blakep82
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| posted on 2/3/11 at 10:44 PM |
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only coz i can't be bothered with the search thing on here
________________________
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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MikeRJ
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| posted on 2/3/11 at 11:29 PM |
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quote:
Originally posted by big_wasa
I still say no as you will not be able to tune the carbs to meet the emmisions over the rev range needed. I could get carbs to pass on mine as its a
pre 95 engine.
Several cars were available with cats whilst still running with carbed engines, so it's certainly possible. You can even run a closed loop
system by having a solenoid controlled air bleed into the manifold.
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Davey D
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| posted on 3/3/11 at 06:57 AM |
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quote:
Originally posted by cliftyhanger
... Not sure how the MoT man will pass the lambda test too if there isn't one fitted?...
you dont have to have a lambda sensor fitted to be able to pass an emissions test. Most BEC dont have a lambda sensor
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cliftyhanger
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| posted on 3/3/11 at 08:46 AM |
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True, but having struggled with an MoT (and given up as it wasn't my car) the lambda figure can be very difficult. Pinholes in the exhaust can
screw it up, and thats after the cat.
The other problem I can see is that if a cat is fitted, it will make a rolling road session rather tricky?? As it will alter the CO and HC levels.
Maybe the cat has to be removed, tune the car and then fit the cat? And cross fingers???
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mcerd1
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| posted on 3/3/11 at 11:44 AM |
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quote:
Originally posted by austin man
doesnt the cat sometimes fall off immediately after and then magically reappears at test time
that's a potentially dangerous tactic as
in theory VOSA could pull you in for one of there roadside spot checks (which have been getting more common up here)
I know of at least one tuned up tin-top running that was with an aftermarket efi setup and no cat and still passed the emissions
he had the thing on the rollers about once a month fiddling with it to keep the emissions legal (and looking for more power too  )
In the long run I think its easier to just fit the cat and the efi and not worry about it
or fit an older pre-95 engine (that you can prove the age of) for the IVA, that'll give your chassis a pre-95 emissions test regardless
of what engine swaps you do at later date
[Edited on 3/3/2011 by mcerd1]
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