73 replies to this topic

[REDA9X]

All Vehicles built after 1976 are under ADR27A.

[LS1LX]

The canisters came out on the 75 model LH's, only the 74's had no canister.
76 on got more pollution gear.

[FastEHHolden]

I am pretty sure you have to go with the higher standard and in this case it is the vehicle...you have to comply with the standard the vehicle was built to..ADR27A if after july 76.


If you put a late model commodore engine in your LX it would have to comply with the vehicle the engine came out of.
If you put a HT motor in a Commodore it has to comply with Commodore standards.

If you put VN heads on a LX block it would have to comply with LX standards (ADR27A)

Its a bummer and you may just get away with it but you may just not.

[Dr Terry]

Hi Guys.

This question has many answers & so far Chopper is the closest.

The 2 levels of anti-pollution gear mentioned on the Compliance plates of Toranas are ADR27 & ADR27A.

ADR27 was 'phased in' during Sept 1973, yes, no mis-type, 1973 during the HQ & LJ series. ADR27 was a resistriction on outputs of HC etc but mainly at idle. In NSW all the rego guys want is a print-out of the exhaust at idle for certification, usually only if a non-standard carby is fitted, otherwise they don't bother. This may not be the case in other states. ADR27 cars left the factory with plugs or caps to stop people fiddling the idle mixture & on the V8s they added the hot air pick-up from the exhaust manifold.

ADR27A, introduced on the 1st July 1976 was the 1st time they introduced engine devices that affected drivability & engine output, with items like EGR valves & retarded cams & ignition systems. The 6 Cyl ADR27A motors got the hot air intake similar to the LH V8s. Early LXs don't have ADR27A.

The carbon canister is a device that captures fuel tank vapours & returns them to the engine to be added to the combustion mix. They were introduced on Holdens on the 1st Jan 1975 but do not feature on the Compliance plate as an ADR. Some rego guys know that 1975 cars require a canister, but many don't. If it was my car, I'd fit one to get rid of the petrol fumes from the fuel tank. Carbon canisters don't affect Horsepower or drivability. 1974 LH Toranas just vent the vapours to atmosphere.

Dr Terry.

[FastEHHolden]

HC is hydrocarbons...unburnt fuel.

Torana482HP...You have just outed yourself as someone that doesn't know how your emission controls work (lots of people don't know..you aren't alone)....no bolt on emission control restricts your performance (EGR, PCV, Carbon canister,heated air inlet)

If everyone at least spent the time to learn how these things work then you would open the market to a whole heap more toranas instead of limiting yourself to pre july 1976 models.

I did a write up in the old forum on how things work...can it be found?

Edited by FastEHHolden, 05 February 2006 - 08:25 PM.

[surfmaster]

(as well as NOx, nitrous oxides)

Sorry, some misinformation. NOx refers to Nitrogen Oxides(all oxides of Nitrogen), whereas nitrous oxide is strictly NO2.

Nitrogen oxides (or are they oxides of nitrogen, don't quite remember) are formed when the combustion chamber temperatures become too hot. On the ADR27a engines (post 01 July 76) the extra pollution gear and lean settings had the engine running a lot hotter which produced the nitrogen oxides. There were sensors on the engine which detected the higher temperature - it advanced the ignition timing when the temps got high to increase the coolant flow which in turn cooled the engine. In effect some of the pollution gear reduced the polution and other parts of it countered the effects of pollution gear itself. That is why these engines had shiploads of rubber tubing and sensors on them.