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Slowly working on putting emissions stuff back on to save the harassment by cops as a p plater. Car is an aus spec 1986 manual turbo. For the life of me I can't figure out how to route the acv! Mine looks alien compared to the american ones online, no electrical connectors, is it vacuum actuated? Below I took a photo of it with what I'm guessing each inlet/outlet is for. Can anybody clarify? Sucks that theres like 10000 different variations of this thing.
From what I understand all the acv's work as such?:
1. Direct air in through LIM and out to exhaust manifold
2. Direct air in through LIM, out from LIM at other port thing to split air pipe to the cat.
3. Relieve excess air from relief pipe.
That's simple enough but then what is that skinny tube going up for? I was thinking maybe on this one the split air comes from there but its pointing in the complete opposite direction?
Thank you in advance!!
That's neat, our ACVs over here in North America don't look like that at all. We have two solenoids. JDM ones are similar. Yours seems to be purely mechanical.
If I had to guess, that extra tube finds its way to the split air tube for the catalyst. On our ACVs it routes through the LIM, and I thought Australia's would be the same, but the diameter looks similar enough that it has me wondering.
I would try posting the same question on Ausrotary.
I've begun asking around, not much luck. I ended up taking it apart and made a diagram on how I believe it works.
So what I read on forums was that the air pump has a clutch and turns off after about 3500 rpm. Is that right for FCs? Because how it looks, it seems the ACV has different conditions for vacuum and boost.
I'm guessing the passage from airpump straight to LIM passage is the one for exhaust ports??. The other unknown pipe gets direct air from the air pump under vacuum, ie idle/cruising. Under boost however, the unknown tube instead is diverted to another opening that goes to the LIM. I'm yet to pry off the block off plate and see what the LIM passages are like so I can determine direction.
Based on the general principle of the ACV, do you know what the unknown tube could be for sure?? Split air?? So strange
the FC air pump does not have a clutch, but in principal it sort of works the same. with the Catalyst engines the air pump air is relieved back to the air cleaner over ~3500rpm, as it not needed.
08-26-22, 02:14 PM
