Cats or no cats? - Aussie V8 | Holden - Ford

leprkorn · 13-05-2008, 07:34 PM

Basically what i want to know is do i need a catalytic convertor for my motor. Its a WB 308 bottom end, with vn injected top end. The RTA writes this:\

Emission standards for replacement engines

1972 and later model vehicles with substitute engines must meet the intent of the later of the Australian Design Rules applicable to either:

a) The original vehicle; or
b) The substitute engine.

To ensure continued compliance with emission standards, any replacement engine should come from a vehicle which is subject to the same or more stringent emission control requirements. An alternative is for an earlier engine to be upgraded during reconditioning to more recent engine specifications. All anti-pollution devices should be fitted and functional. Vehicles manufactured prior to noise and/or exhaust emissions related ADRs must meet certain minimum noise and emission requirements if the engine modification is to such an extent as to require certification by an engineering signatory. Engineering signatories will be able to give you more information about these requirements.

has anyone come across this issue, and if so, what did you do about it?

cheers,
brett

PRO-GMH · 14-05-2008, 02:36 PM

WBs dont run cats from the factory. You have a WB block and therefore are not required to run catalytic convertors.

You have a WB engine (forget the EFI) so you must run all emissions applicable to that engine in your car.

If it were a VN block then you would be required to run cats as the VN engine requires it in the VN!

leprkorn · 14-05-2008, 06:13 PM

Quote:

Originally Posted by PRO-GMH

WBs dont run cats from the factory. You have a WB block and therefore are not required to run catalytic convertors.

You have a WB engine (forget the EFI) so you must run all emissions applicable to that engine in your car.

If it were a VN block then you would be required to run cats as the VN engine requires it in the VN!

thanks PRO. i was thinking what would i do in this situation:

police pull me over, question me, ask me to pull the bonnet, i do cause i'm a nice guy and have nothing to hide, and they see the injection gear, and go commy motor....where's ur cats sonny?

i obviously don't want to sound like a smartass. should i get something like that engineered to avoid the aggravation?

sorry for sounding like a docile, but i'm just covering the bases.

cheers,
brett

Smitty2 · 14-05-2008, 07:13 PM

Quote:

Originally Posted by PRO-GMH

WBs dont run cats from the factory. You have a WB block and therefore are not required to run catalytic convertors.

You have a WB engine (forget the EFI) so you must run all emissions applicable to that engine in your car.

If it were a VN block then you would be required to run cats as the VN engine requires it in the VN!

...spot on

leprkorn · 14-05-2008, 07:34 PM

i no its not important but 1000 posts for smitty!!

and thanks for ur help!

Woodsy · 14-05-2008, 08:47 PM

If you're that bothered why dont you pick up a couple of cats (or one if you do it right) from the local wrecker, cut them in half, pull all the guts out and just weld each half to one of the engine pipes. For a plod on his knees looking under your tunna with a torch it'll look like there are set of cats there (provided they aren't too close to the back of the cab

).

leprkorn · 14-05-2008, 09:35 PM

woodsy, its only got the extractors thus far. i'm yet to organise the rest of the system (but it will be soon now its running), and was just finding out whether i'd need the cats, cause if i ain't gotta pay for/get them, then i wont.

cheers,
brett

PRO-GMH · 15-05-2008, 09:08 AM

I wouldnt bother putting cats in it because:

a: They cost money
b: When gutted theyre more inefficient than standard
c: You dont require them so why waste your time

If the copper doesnt believe you get him to run your engine number and prove its not late model.

Woodsy · 15-05-2008, 10:27 AM

Just to be clear, I'm not talking about gutting the cats and having them in-line in your system. I'm talking about welding the shell to the outside of your pipe to make it look like you have cats. It won't pass a proper inspection but it should be enough to throw the odd roadside inspector off.

But then again, if you don't need em you don't need em hey.

leprkorn · 15-05-2008, 07:20 PM

thanks pro. saves me a bit in money and worry.

if its not being too bold, is it safe for me to assume that i wouldn't require an airbox either?

also, what were the emission requirements 4 a wb stato?

many thanks,
brett

mr_460bigblock · 16-05-2008, 12:45 PM

why not get a airbox made or use a factory item, make a nice cold air feed into it??? the way id go if i was going injection

i used to have a EB falcon V8, i modified the factory airbox to house a unifilter rampod filter setup with a cold air feed comming from the bumper... cops never hassled me one cause they didnt even know

more than one way to skin a cat

dr.legal · 16-05-2008, 02:19 PM

All of the above statements are correct. You don't need cats.

A WB is required to meet ADR27a. i.e. full pollution gear. As long as you meet or exceed that, you won't have a problem. I wouldn't worry about getting an engineers report because there's nothing to engineer.

The airbox setup sounds good but you'd have to move your battery.

doc

13-05-2008, 07:34 PM	#1 (permalink)
leprkorn social drinker Trade Rating: (0) Join Date: Oct 2007 Location: Gloucester, NSW Ride: One Tonner Posts: 263	Cats or no cats? Basically what i want to know is do i need a catalytic convertor for my motor. Its a WB 308 bottom end, with vn injected top end. The RTA writes this:\ Emission standards for replacement engines 1972 and later model vehicles with substitute engines must meet the intent of the later of the Australian Design Rules applicable to either: a) The original vehicle; or b) The substitute engine. To ensure continued compliance with emission standards, any replacement engine should come from a vehicle which is subject to the same or more stringent emission control requirements. An alternative is for an earlier engine to be upgraded during reconditioning to more recent engine specifications. All anti-pollution devices should be fitted and functional. Vehicles manufactured prior to noise and/or exhaust emissions related ADRs must meet certain minimum noise and emission requirements if the engine modification is to such an extent as to require certification by an engineering signatory. Engineering signatories will be able to give you more information about these requirements. has anyone come across this issue, and if so, what did you do about it? cheers, brett __________________ IF IN DOUBT, POWER OUT! "You wouldn't care what people thought of you if you realised how seldom they do."

14-05-2008, 02:36 PM	#2 (permalink)
PRO-GMH Senior Member Trade Rating: (0) Join Date: May 2007 Location: Bronx Ride: monaro coupe 350 Posts: 673	WBs dont run cats from the factory. You have a WB block and therefore are not required to run catalytic convertors. You have a WB engine (forget the EFI) so you must run all emissions applicable to that engine in your car. If it were a VN block then you would be required to run cats as the VN engine requires it in the VN! Last edited by PRO-GMH; 14-05-2008 at 02:40 PM.

14-05-2008, 07:34 PM	#5 (permalink)
leprkorn social drinker Trade Rating: (0) Join Date: Oct 2007 Location: Gloucester, NSW Ride: One Tonner Posts: 263	i no its not important but 1000 posts for smitty!! and thanks for ur help! __________________ IF IN DOUBT, POWER OUT! "You wouldn't care what people thought of you if you realised how seldom they do."

14-05-2008, 08:47 PM	#6 (permalink)
Woodsy D.I.L.L.I.G.A.F? Trade Rating: (0) Join Date: Jan 2006 Location: Mackay Ride: 82 VH SL/E Posts: 1,025	If you're that bothered why dont you pick up a couple of cats (or one if you do it right) from the local wrecker, cut them in half, pull all the guts out and just weld each half to one of the engine pipes. For a plod on his knees looking under your tunna with a torch it'll look like there are set of cats there (provided they aren't too close to the back of the cab ). __________________ Stock stroke 308 in full weight 1982 VH SL/E = 13.019 @ 106.68MPH Thomas Oliver Woods 16/05/40 - 20/08/07 You will always be with me Dad

14-05-2008, 09:35 PM	#7 (permalink)
leprkorn social drinker Trade Rating: (0) Join Date: Oct 2007 Location: Gloucester, NSW Ride: One Tonner Posts: 263	woodsy, its only got the extractors thus far. i'm yet to organise the rest of the system (but it will be soon now its running), and was just finding out whether i'd need the cats, cause if i ain't gotta pay for/get them, then i wont. cheers, brett __________________ IF IN DOUBT, POWER OUT! "You wouldn't care what people thought of you if you realised how seldom they do."

15-05-2008, 09:08 AM	#8 (permalink)
PRO-GMH Senior Member Trade Rating: (0) Join Date: May 2007 Location: Bronx Ride: monaro coupe 350 Posts: 673	I wouldnt bother putting cats in it because: a: They cost money b: When gutted theyre more inefficient than standard c: You dont require them so why waste your time If the copper doesnt believe you get him to run your engine number and prove its not late model.

15-05-2008, 10:27 AM	#9 (permalink)
Woodsy D.I.L.L.I.G.A.F? Trade Rating: (0) Join Date: Jan 2006 Location: Mackay Ride: 82 VH SL/E Posts: 1,025	Just to be clear, I'm not talking about gutting the cats and having them in-line in your system. I'm talking about welding the shell to the outside of your pipe to make it look like you have cats. It won't pass a proper inspection but it should be enough to throw the odd roadside inspector off. But then again, if you don't need em you don't need em hey. __________________ Stock stroke 308 in full weight 1982 VH SL/E = 13.019 @ 106.68MPH Thomas Oliver Woods 16/05/40 - 20/08/07 You will always be with me Dad

15-05-2008, 07:20 PM	#10 (permalink)
leprkorn social drinker Trade Rating: (0) Join Date: Oct 2007 Location: Gloucester, NSW Ride: One Tonner Posts: 263	thanks pro. saves me a bit in money and worry. if its not being too bold, is it safe for me to assume that i wouldn't require an airbox either? also, what were the emission requirements 4 a wb stato? many thanks, brett __________________ IF IN DOUBT, POWER OUT! "You wouldn't care what people thought of you if you realised how seldom they do."

16-05-2008, 12:45 PM	#11 (permalink)
mr_460bigblock casual poster Trade Rating: (0) Join Date: Dec 2007 Location: newcastle Ride: subaru brumby, the slave getting parts for the XA Posts: 113	why not get a airbox made or use a factory item, make a nice cold air feed into it??? the way id go if i was going injection i used to have a EB falcon V8, i modified the factory airbox to house a unifilter rampod filter setup with a cold air feed comming from the bumper... cops never hassled me one cause they didnt even know more than one way to skin a cat __________________ A wise man once said about an old mountain: "There is no Substitute for cubic inches...." Some countries have Volcano's, One has Everest, We have Mount Panorama.... The Greatest Mountain of them ALL 466ci / Tremec TKO600. Be back on the road soon...

16-05-2008, 02:19 PM	#12 (permalink)
dr.legal Part of the furniture Trade Rating: (0) Join Date: Oct 2005 Location: Eltham, Victoria Ride: VX Commy Posts: 1,468	All of the above statements are correct. You don't need cats. A WB is required to meet ADR27a. i.e. full pollution gear. As long as you meet or exceed that, you won't have a problem. I wouldn't worry about getting an engineers report because there's nothing to engineer. The airbox setup sounds good but you'd have to move your battery. doc __________________ No matter where you go, there you are.

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