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Location:
Adelaide
Registered:
June 2003
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18RGU emissions info needed for RWC
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Tue, 03 June 2003 14:24
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On top of my brother's 18RGU cam cover on the drivers side there is a large emission control valve. It has two large diameter tubes coming from it and an electrical wire.
It looks like a Mixture control valve but we aren't sure what to connect the wire to.
If anyone out there has an original 1977 celica GT or any other twin cam car with this valve connected, could you please let me know what the electrical wire connets to.
Our best guess is a vaccuum switch of some type but we don't have one and the local businesses have not been very helpful.
Any help would be greatly appreciated as we will need this to get it past SA motor reg. inspection.
Pictures of the electrical device that it connects to would be really great, as would part numbers.
Thanks.
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU emissions info needed for RWC
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Mon, 09 June 2003 00:57
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Just about every 18rgu I have seen, including mine has had all of the polution gear taken off. My engine came with this thing in a box. I'll find a picture for you.
But I have no Idea where the wire goes too. sorry
to run all the pollution gear you will need the air compressor pump. do you have this? the rest of the gear is usless unless you have it. other wise just take it all off. block off the air injection ports under the exhaust outlets and the at the bottom of the exhaust manifold. looks like it never had any pollution gear to start with. Should be find as long as you are putting it into a car that is pre August 1976
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Location:
Brisbane
Registered:
December 2002
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Re: 18RGU emissions info needed for RWC
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Mon, 09 June 2003 01:00
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Sorry my mistake. i also found this. the 18rg did have the valve too. looks like the wire went down to some place on or near the carbies.
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Location:
Adelaide
Registered:
June 2003
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Re: 18RGU emissions info needed for RWC
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Mon, 09 June 2003 23:50
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Thanks Blaze, the most helpful pic I found was an 18rg pic on this site of a white '77 gt.
Yes we have an assortment of air pumps but not the stuff that goes with it. We found a guy who was willing to lend the tubing and stuff to us but then he went on holiday.
The engine is going into a '77 celica.
The RWC guy on the phone couldn't tell us waht we needed as they didnt know, so we might be able to get by without the air injection. I've also heared that not all 18rgu's came with air injection. If anyone has heared any different, please let me know.
I've since found out that the big ugly valve on the top (looks like an "outer vent control valve" but is rigged up like an electric version of a mixture control valve) is connected up to an emission control computer, not what I wanted to hear as they were all left in Japan.
We've figured out how it works and will be chasing up a vacuum switch from a hiace that breaks the electrical circuit at around the 400mm/hg mark. That should run it and look original. They were also in some RA40 celicas (according to Haynes manual)
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Location:
Gold Coast
Registered:
October 2002
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Re: 18RGU emissions info needed for RWC
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Wed, 11 June 2003 10:28
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i believe 'R' stood for air injection. so if the engine was an 18RGRU then you would need it is suspect.
Daniel
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Location:
Adelaide
Registered:
June 2003
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Re: 18RGU emissions info needed for RWC
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Fri, 13 June 2003 06:21
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Sorry MUNKI but I'm pretty sure that the "R" meant that the engines were for use with regular fuel (ie. not 98 octane as was required with the original 18RG motors).
That is why all the 18RGR engines took a drop in compression from their predecessors.
I have heared two theories behind the "U" designation.
1) Japanese emission spec.
2) Japanese fitted air conditioner compressor
I think the relationship between these two, the presence of some sort of air pump, means that the true meaning of the letter might have got lost in translation somewhere between Japanese and English.
If anyone can say that they are 100% certain of either of these theories I would like to hear what you've heard.
Thanks,
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18RGU emissions info needed for RWC
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Fri, 13 June 2003 08:41
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U = japanese emissions control equipment.
C = californian emissions control equipment
R = regular fuel/reduced compression
E = EFI
G = twincam wide valve angled head
Hope this helps.
I have found a pic of mine that shows an original RA35 GT-V with the 18R-GU fitted. However my picture doesn't show where the wire you refer to is connected  It just shows where the hoses go and that the wire runs down below the thermostat housing *somewhere*
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Location:
Adelaide
Registered:
June 2003
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Re: 18RGU emissions info needed for RWC
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Tue, 17 June 2003 03:57
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Thanks for that, that reinforced my initial thoughts from what I've read.
What are the chances of getting that photo posted on the board.
I have managed to find a completely original 18RGU that has just come over from Japan. I don't know what it was from but it is a real mess with emission control stuff.
You can hardly see the block for the tubing and valves.
I really hope that all 18RGUs did not have the same set up.
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