thegasmen
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| posted on 27/12/06 at 03:05 PM |
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to fit cat or not
The dax rush im building is a 98 carbed blackbird, will i need to fit a cat to it. speaking to the mot place today he says that you cant fit lamba
sensors to a carbed motorcycle.And the lamba sensors control the amount of fuel to air ratio to stop damadging the cat.
anyone have any ideas.
regards mick
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macnab
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| posted on 27/12/06 at 03:53 PM |
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like wise I was under the impression (infact I know you can't) it's not possible to have a carb & a cat. You've got a big prob
there...
Can you fit a more modern injection system to the engine???
[Edited on 27/12/06 by macnab]
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DIY Si
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| posted on 27/12/06 at 04:03 PM |
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The cat is an entirely stand alone device that can be fitted to any engine to reduce CO and hydrocarbon emissions. It can be fitted to carb's
and FI engine. The lamda sensor is merely there to measure the O2 content of the exhaust gases (I think).
Also, the SVA and MOT emission level don't necessarily have anything to do with each other, as trhe SVA testes the age of the engine, the MOT to
the age of the plate (or it should do before anyone says anything  ), although some do find that the SCA limits get printed on the V5.
[Edited on 27/12/06 by DIY Si]
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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zxrlocost
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| posted on 27/12/06 at 04:03 PM |
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Ok so
lets start from fresh any engine after 95 Bike or car, has to pass a cat test YOU WILL NOT PASS THE TEST WITHOUT A CAT that is certain on a bike
engine
now my r1 carb engine didnt have a lamda sensor obviously
so therefore you have to adust the carbmixture screws LOTS of times(can be very fidly infact its a pissing pain in the ass and I cant believe Im
aiming to do it again!!) to meet the required SVA requirements
forget what it does to the CAT thats the least of your worries
MY CAT system has been used on 7 BECs to get them through the SVA and hasnt failed them yet
[Edited on 27/12/06 by zxrlocost]
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thegasmen
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| posted on 27/12/06 at 04:33 PM |
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cat problem
Thanks fellas
when i rang sva in summer they told me it had to have a cat to pass sva so from what ive found out from the mechanic TODAY its going to shag the cat
eventually and the car will run shite also,but he says that due to mot law the car will pass on the age of the doner car age which is 1991 sierra
which doesnt need a cat. So does any body want to rent out there cat silencer for sva to be removed for a standard can when passed.BLOODY REDICULAS..
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zxrlocost
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| posted on 27/12/06 at 04:57 PM |
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hi mate
no one leaves the cat on after SVA
the cars dont need MOTING for three years anyway
your also most likely to get a Q plate so there is no emissions test after the SVA forever
I have one you can rent where abouts are you
ta chris
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thegasmen
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| posted on 27/12/06 at 05:24 PM |
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cat silencer
Hi Chris
Im up in leeds west yorkshire
Its not going to be for a while yet.
regards mick
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DIY Si
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| posted on 27/12/06 at 05:32 PM |
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Just actually seen you're running a "Bird. Mine must've had a CAT at some point (for the SVA), but certainly doesn't now, and
passed it's MOT with flying colours. Only takes about 15-20 mins to do, so quick the bloke gave me a coffee so he had something to do for the
other 20 mins!
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Wadders
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| posted on 27/12/06 at 05:37 PM |
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Iv'e got a full closed loop lambda air bleed system, and a cat welded to a standard gsxr can, which you can borrow for your sva. You'll
have to adapt your existing exhaust to fit it though, and it needs a boss in the collector for the lambda sensor. I'm sure we can cobble
something up.
Worked fine on my carbed ZX9. I live in Leeds 26 btw.
ATB
Al.
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joscorstjens
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| posted on 28/12/06 at 11:40 PM |
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Closed loop lambda? So which ECU are you using?
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Bob C
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| posted on 28/12/06 at 11:54 PM |
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You can get through SVA with a carbed bike engine and a cat - I did it last week. On a Q plate I should never need the cat again so I'll sell it
on. With the cat on I got very low CO and HC but the lambda wandered about a bit, however I was able to pass.
If you're going for an age related plate and will need to pass emissions at MOT every year, it's probably worth investing in a closed loop
system wth electrically operated air bleed valves as detailed on R Miles "strikerR1" website - and leaving it on.
Otherwise it looks like an unnecessary investment.
From memory it was called a "rent-a-cat" system, cost over a hundred GBP, and was obtained from "allbikes" ....???? It was a
wee micro that looked at a lambda probe & clattered some air bleed valves to get the lambda right - you set the carbs up a bit rich.
Bob
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