BobBrumby Posted March 25, 2004 Share Posted March 25, 2004 I have been thinking off de'emsissioning my 1990 ea82 carbed brat for a while and have read a few previous posts on this before. From what I have read most people have chosen to leave the pcv system in and i prob will too. I just wanted to know what systems I should kill and what to leave to add a little perofrmance and clean up the engine bay (air injection, egr, charcoal canister?) Yeh and btw i live in australia, queensland and as long as you pay the registration its considered road worthy. But if u let it get unregistered you need to get a road worthy cert. from a mechanic before u can register it again. For example we dont have tail pipe tests or underhood inpections periodically as I hear you guys do. So bad emmsions aint really a huge problem Any replies would be good, thanks Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 25, 2004 Share Posted March 25, 2004 EA82? So you installed this engine I take it? Also - do you have a feedback carb or a regular carb? ei - is there a computer under the driver side dash.... if so I would not touch anything. Any way - yes, definately leave the PCV system. It's not emmissions related anyway. It's there to release blow-by gasses from the crankcase so they do not dilute the engine oil. Removeing it therefore would be BAD. You can remove the evap canister - just make sure you run the float bowl vent tube somewhere.... into the air filter box would be good. You can leave the gas tank vent line open to the air. The only other system you have that is "emmissions" related is the AIS or Air Injection System. This *can* be removed, but it's a pain, and it's easier to just disable it. The AIS valves are located.... well I'm not sure where they would be on an EA82, but on an EA81 you can simply put a quarter (US funds ) in the pipe fitting leading from the head to block off the flow of air into the exhaust. That will effectively disable them. Also prevents them from failing and squirting molten plastic into your carb.... GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted March 25, 2004 Author Share Posted March 25, 2004 "You can remove the evap canister - just make sure you run the float bowl vent tube somewhere.... into the air filter box would be good. You can leave the gas tank vent line open to the air." In my Gregory's Service Manual it says it has two vapour hoses, a purge hose and a vacuum pipe. Is the float bowl tube sometimes called purge hose. And I duno what kindof carbi it is and the engine came in the car when i bought so no i didnot drop it in myself. I just assumed it was ea82 cause its a 1990. If it aint could u tell us? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 25, 2004 Share Posted March 25, 2004 All Brat's/Brumby's should be EA81's. That's a 1.8L overhead valve engine. Only the Loyale line got the EA82 engines. The purge hose is opened by a thermo-vacuum valve when the engine reaches operating temperature in order to pull the evaporated gasses from the cannistor to be burnt. Just plug this port on the carb, remove the lines, and the cannistor. This line purges all the vent lines - it burns the evap gasses from the float bowl, the front fuel filter, and the gas tank.... so all the vent lines from each of these items should be removed. The tank and the float bowl need to be vented - usually into the air filter, or just left open, and the fuel filter vent (known as a vapor seperator) can just be plugged, or replace the filter with a normal aftermarket style filter.... that's what I do. I'm not sure what the "vacuum pipe" is - but there is a fuel bowl vent line.... usually on top of the carb near the fuel inlet somewhere. This line needs to be left in place for the carb float bowl to properly vent gasses and releive any pressure that might build up due to same. GD Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted March 25, 2004 Author Share Posted March 25, 2004 The purge line from the charcoal canister runs directly into the intake manifold. The vacuum line just runs to one of those vacuum hard lines comming from under the inlet manifold. Can I just run the bowl vent line directly to the inlet manifold where the pruge line used to go in and plug the vent line allong with fuel tank line? Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 25, 2004 Share Posted March 25, 2004 I wouldn't run the bowl vent into the intake manifold - I would run it into the air filter housing. But that's just me. I wouldn't do it because I don't like the idea of having a vacuum port open to the inside of the float bowl. Two reasons - one, doing that could actually introduce a vacuum leak depending on the internal construction of the carb, and two that is not supposed to be a pressurized system - adding vacuum will negatively pressurize the float bowl, and that could potentially change the float level, or suck gas into the vent line durring a hard turn. The vac lines that run into the hard lines under the manifold are for the vacuum advance on the disty, and the EGR valve. You can run these lines directly instead of through the hard lines - the hard lines tend to go to other places you don't need them too, and usually mess things up with potential leaks and such. I generally just run new lines to the disty and the EGR directly from the carb. Tends to make trouble shooting easier. GD Quote Link to comment Share on other sites More sharing options...
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