macca1
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| posted on 14/1/09 at 10:49 AM |
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Understanding Cat cell figures?
Can anyone explain to me what "Cell number" I should be looking for.eg 200/400 etc And what does it mean?
I'm looking to fit one to an 03 R1 engine for SVA testing.
Thanks
Col
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Mr Whippy
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| posted on 14/1/09 at 11:26 AM |
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at a monumental guess...could that not be the number of honeycomb passages through the element??? I'd not be surprised if they were in that kind
of numbers. Didn't know they were rated that way if it is and even looking at that picture they seem to show two different sizes of passage!
like you see in this pic -
[Edited on 14/1/09 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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iiyama
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| posted on 14/1/09 at 11:58 AM |
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This may help:-
http://www.jetex.co.uk/website/sportscatalysts.php
If its broke, fix it. If it aint broke, take it apart and find out how it works!
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procomp
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| posted on 14/1/09 at 12:27 PM |
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Hi
400 is your basic road going as fitted to 99% of road cars. And usually the internals are manufactured from a ceramic material.
200 is what is being sold by many of the aftermarket suppliers as a sport cat. with a metal construction internals coated and will not break up like
the ceramic road versions when subjected to vibrations / abuse. But is still restrictive.
100 is what is referred to as a race cat and is less restrictive. And has the same internal construction materials as the 200.
Ideally you want a 100 cell cat for performance. As yet i am not sure if that will actually be guaranteed of passing MOT emissions etc. But dose pass
the "yes i have a cat fitted sir".
Cheers Matt
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adithorp
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| posted on 14/1/09 at 12:34 PM |
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CPI is cells per sq inch. Normal ceramic cat's are usually 400cpi. The fewer cpi then the better the gas flow but less efficency at converting
the gasses (less surface area). Sports cats are stainless construction and either 100cpi or 200cpi. They can give up to 15bhp advantage over standard.
I'm running a 200cpi on my R1 and it does the job. It's coming off though when I get time.
adrian
edit... must type faster!
[Edited on 14/1/09 by adithorp]
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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andylancaster3000
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| posted on 14/1/09 at 01:33 PM |
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quote:
Originally posted by procomp
100 is what is referred to as a race cat and is less restrictive. And has the same internal construction materials as the 200.
Ideally you want a 100 cell cat for performance. As yet i am not sure if that will actually be guaranteed of passing MOT emissions etc. But dose pass
the "yes i have a cat fitted sir".
Cheers Matt
What about a 0-Cell Cat (cat housing) and ''yes I have a cat fitted Sir/Mr scuitineer" 
Obvioulsy I'm not insinuating that I would consider such a thing, but its the first 'fast one' I can see people trying to pullthis
year...
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macca1
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| posted on 14/1/09 at 01:35 PM |
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quote:
It's coming off though when I get time.
Would by any chance be coming up for
sale?
If not I'm lookin at one of these, anyone using one?
Link
As it's mainly for SAV reasons I'm thinking that the 400 is my best chance at a pass even though it will have the biggest impact on
performace.
[Edited on 14/1/09 by macca1]
[Edited on 14/1/09 by macca1]
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procomp
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| posted on 14/1/09 at 03:26 PM |
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Hi
regarding a 0 cell cat for motorsport use. Virtually all officials are saying they will want to view the internals of the cat. If no internals you
fail. It would be quite a bit of a job to make internals that looked like the minimum required that was actualy less restrictive than a 100 cell cat
actualy is.
Afraid we are just going to have to fit them and be greatful they are for now not actualy testing for emissions also.
Cheers Matt
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andylancaster3000
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| posted on 14/1/09 at 05:03 PM |
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quote:
Originally posted by procomp
Afraid we are just going to have to fit them and be greatful they are for now not actualy testing for emissions also.
Cheers Matt
Very true. I suppose it is just a bit of a token jesture, for the moment at least. If they ever do try to test the emmisions of carb'd race
engines it will be a somewhat more interesting matter....
(apologies for the slight thread hijack btw!)
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adithorp
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| posted on 14/1/09 at 07:01 PM |
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quote:
Originally posted by macca1
quote:
It's coming off though when I get time.
Would by any chance be coming up for
sale?
If not I'm lookin at one of these, anyone using one?
Link
As it's mainly for SAV reasons I'm thinking that the 400 is my best chance at a pass even though it will have the biggest impact on
performace.
[Edited on 14/1/09 by macca1]
[Edited on 14/1/09 by macca1]
Unfortunately not going to be for sale. As its in the side-pod of the Fury it didn't have to be pretty so is mounted with welded flanges (not
really 7 friendly). That way I can just take it out and bolt in either an through pipe or small silencer once I get around to making them. Then again
I might just make a bigger single silencer.
http://i189.photobucket.com/albums/z282/adrianthorp/fury052.jpg
If your planning to leave it in the system post SVA then I'd go for a 200cpi, otherwise a 400cpi will do.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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