94VXLSHatchie

so yeah, as the title states, is there a differnce between the two?? in size i think theyre both the same, but im asking that because i tried to ref my car and i had a SOHC cat on there and i have a B-series motor, a B18b1 to be exact, and it failed the smog portion of the test, would a CAT meant for the LS make emissions better?? also is a bosch o2 sensor not better than a NTK(made by NGK)

Luserkid

A cat's a cat. But if its a bad cat then its not going to help you. What were your readings?

94VXLSHatchie

these were my readings:

CO2= 13.6(15mph) and 12.9(25mph)
O2= 1.9(15mph) and 1.4(25mph)
HC= 43(15mph) and 90(25mph)
CO= .05(15mph) and 1.70(25mph)
NO= 1905(15mph) and 1504(25mph)

i was told by a honda mechanic that there's a diff between cats, but im not too sure...

Luserkid

Did they mark you as a gross polluter? Was the car warm or cold? Looks like your running rich also. Do a tune up and get a new cat.

The difference between the 2 is the lenght, but what it does is the same.

94VXLSHatchie

no, not a gross polluter, car was warm, i am about a 45 minute drive from the ref station so i drove it enough for the cat to be hot enough....i did do a tune up, i know the size is different, but how can they be the same? i mean, a dual cam motor will put out more emissions than a single cam, wont it?

also how would i make it run not rich? map sensor? i have a stock ecu....would valve adjustment fix this too? or at least make it better?..... help please

94VXLSHatchie

bump!! please help, i have ref on friday!

MidwestCartel

length and ID" and OD", thats about it.

So in theory, a longer cat could filter better?

however your problem probably leads to an exhaust leak, since the ID's and lengths might be different.

sicones

the difference between civic sohc, or integra dohc cats are just a slight different in length and shape, they all have a 2" ID and the same exact internal ceramic catalyst

94VXLSHatchie

no, i have no exhaust leak, the sohc cat was fitted and welded to match the b-series header....so i know i have no leak....

anyone else??

94VXLSHatchie

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sicones &raquo;</TD></TR><TR><TD CLASS="quote">the difference between civic sohc, or integra dohc cats are just a slight different in length and shape, they all have a 2" ID and the same exact internal ceramic catalyst</TD></TR></TABLE>

so do you think that the cat i was using might have been bad?? it was a OEM honda cat off the hatch, so im guessing its more than 10 years old... i have a brand new cat, and i bought it for an LS, and it looks identical to that of a single cam, size and all, not too sure about length, but thats not an issue.....

sicones

sounds like you just need a tune up, use regular gas and if you still fail you probably have a dead cat

and you should get a DENSO O2 sensor, bosch is crap

94VXLSHatchie

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sicones &raquo;</TD></TR><TR><TD CLASS="quote">sounds like you just need a tune up, use regular gas and if you still fail you probably have a dead cat

and you should get a DENSO O2 sensor, bosch is crap</TD></TR></TABLE>

yeah i did a full tune up already, oil, plugs, cap and rotor, wires, pcv valve, and i just chnaged in a new map sensor, when i went to ref i had a bosch o2 sensor, and the ref told me that those are crap, so now i have an NTK(made byNGK) o2 sensor brand new, i also have the brand new cat, so i might as well throw it in there, can you take a loook at my sniffer readings and tell me what you think i should do?? thanks, all the help is greatly appreciated!

MidwestCartel

how did you have your sohc cat fitted to your b series header?

94VXLSHatchie

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidwestCartel &raquo;</TD></TR><TR><TD CLASS="quote">how did you have your sohc cat fitted to your b series header?</TD></TR></TABLE>

took it to an exhuast shop when i got the swap done....i know a lot of ppl running a sohc cat on their b-series swaps....

HELP PLEASE!!

94VXLSHatchie

bump!

MidwestCartel

some B and D's have the same part #'s so no difference. Only OBD1, and OBD2.

Its something else in your car, post up your score card.