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1979 633csi emissions without thermal reactors

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oldbugeye
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1979 633csi emissions without thermal reactors

Post by oldbugeye » Sat Dec 30, 2017 4:54 pm

A customer at the bmw shop I work at gave me his 633csi yesterday! It no longer has any emissions stuff and very low on power . It has a ripped intake boot and didn’t run at all until I taped it . A new one is in the mail . Anyway how do you guys get through emissions? I live in Colorado and they are pretty strict.
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

GRNSHRK
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Re: 1979 633csi emissions without thermal reactors

Post by GRNSHRK » Mon Jan 08, 2018 8:42 pm

Welcome to the madness, now how cool is that \:D/

Regarding getting through emissions testing in CO, meh, try CA :-&

There are several members from CO on the board, tshultz and hefeweisen come to mind, might want to PM directly for info, pretty sure both have series I (early) cars and Tom has an '80 Euro as well, surely "fun" to get tested [-X

Once again, welcome =D>

:mrgreen:
:mrgreen:
Bobbo
1980 633 CSi
Cypress Green/Pearl Beige
2011 F10 528i
2005 E46 330 Ci ZHP Cabrio
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LandShark
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Re: 1979 633csi emissions without thermal reactors

Post by LandShark » Thu Jan 11, 2018 1:43 am

Congrats on the acquisition. New Mexico is emissions friendly, just saying. Even in Abq, over 35 years old is the golden number for emissions exempt. Check to see what year your cylinder head is, the one I just replaced was a 79' and it was cracked.
Karmann, German for extra rusty.

oldbugeye
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Location: Colorado

Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Fri Jan 12, 2018 2:17 pm

It has a spare head in the trunk so maybe it’s been replaced or maybe it needs to be replaced haha . I was thinking about just welding flanges for a removable cat or cats but I feel like it would destroy a cat pretty fast . I haven’t even attempted to get it though. Think the people who work there know what the air injection and reactors look like . I have those also in the trunk . How bad is it to bolt them on once every two years . How do they even work ? Thanks for any help !
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

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tschultz
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Re: 1979 633csi emissions without thermal reactors

Post by tschultz » Fri Jan 12, 2018 11:12 pm

So is it 1983/84 or is it an earlier car.

I don't have experience with air injection but with a cat a the engine tuned up close you should be fine. Easiest would be to get a wideband gauge and see what it's doing after you get it running OK.

For emissions if it is running well and you have a CAT you should be fine. The problem is running lean and getting a reading of high NOx to fail.

I really appreciated this post:
viewtopic.php?t=19661

oldbugeye
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Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Sat Jan 13, 2018 2:04 am

It is a 79 that had reactors instead of cats . I do still have them how do Thermal reactors work ? Can I just bolt them on temporarily? Without doing a bunch of plumbing? Thank you for the link that was helpful .
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

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tschultz
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Re: 1979 633csi emissions without thermal reactors

Post by tschultz » Sat Jan 13, 2018 2:54 am

Before '82 I think, you only need to pass the two idle test here in Denver, so you may actually be able to pass if you show up with a warmed up engine... Worth the $20 to try I'd say.

I saved this from my dad's E3 which had the same system:
Image
and another schedmatic: https://www.bmw2002faq.com/applications ... 268e737c34

I haven't messed with one so I don't exactly know how it works, but it looks like it takes exhaust gasses and pushes them back through the engine after they go through some sort of filter. It seems the air pump also somehow reduces the concentration of exhaust gasses by adding heat...

It is well known that these systems caused so much heat that cylinder heads were cracked and a lof of these systems were removed from the engines.
Air injection tubes in each exhaust port to cause the exhaust gases to get HOTTER!
EGR dumps nasty carbon building krapp into your intake track - really fouling up the intake ports, Intake valves, and causes very poor running when the system is sick

oldbugeye
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Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Sat Jan 13, 2018 3:10 am

Yes I am going to try tomorrow. I am just praying the the people working there don’t know enough to tell that All that stuff is gone .
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

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zinnocoupe
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Re: 1979 633csi emissions without thermal reactors

Post by zinnocoupe » Tue Jan 16, 2018 6:05 am

I just removed al the egr crap from my 77 e12. It seems to be an unbelievably complicate and primitive system. I doubt I would be able to replace it all correctly and make it work again if I had to in order to pass emissions. I think the way it works is the belt driven air pump that resides above the alt, pumps air in to the the front of the exhaust manifold then the oxygen makes the exhaust gases completely burn all the nasty hydrocarbons up and spews clean( haha) air. The exhaust manifolds get extremely hot and in my cars case the tar heat shield material has actually turned molten and flowed down the side of the inner fender . Its a hardened black goo mess all along the frame rail. I've all also picked up a set of E12 M535i exhaust manifolds and downpipes to replace the dreaded thermal reactors. I'll be interested to hear how you do at the emission testers. I'll bet they have no idea what the egr/thermal reactor system should look like. Although they may wonder where the cat is. Good luck
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1979 Euro 635ci no longer a basketcase, just a running rust bucket!
1977 530i New addition ( nonrunner)
1987 635csi 60K KM Garage Queen

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Hefeweizen
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Re: 1979 633csi emissions without thermal reactors

Post by Hefeweizen » Tue Jan 16, 2018 2:45 pm

Sorry but I live in Colorado Springs where we don't have that requirement. Tom got all the points covered and unfortunately, I have nothing to add but the usual stuff like: New spark plugs, filter, oil change maybe?
Rainer
85 635CSi (Silver, Daily Driver)
79 633CSi (Red Euro, Project)

"If you think a good European mechanic is expensive, try a bad one!"

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cgswift
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Re: 1979 633csi emissions without thermal reactors

Post by cgswift » Sat Jan 20, 2018 12:59 pm

If I'm not mistaken, your car will qualify for the 'Collectors' license plate here in Colorado. You should be able to take it to one of the few remaining emissions stations for older cars and have it tested. These guys are few and far between, but generally very workable, wink-wink, as far as obtaining a passing emissions test. ($) If you do pass, your plates are good for five years and you generally will never need to have another test. Toph
1983 633CSi Balticblau Metallic
1972 K5 Blazer w/4Wheel Popup
1972 Datsun 510 Badass Monster!
1959 Corvette FI 283
1950 8N Ford Tractor (Harrison)

"Strive for perfection, excellence will be accepted."

oldbugeye
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Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Tue Jan 30, 2018 7:51 pm

Do you know of any of these classic car emissions shops in the Denver area . A quick google search didn’t show me any.
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

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cgswift
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Re: 1979 633csi emissions without thermal reactors

Post by cgswift » Tue Jan 30, 2018 8:39 pm

https://www.emissions.org/colorado-emis ... locations/

You can try any of these, on the phone first, to explain your issue. Maybe see if you can get a helpful and positive response. Toph
1983 633CSi Balticblau Metallic
1972 K5 Blazer w/4Wheel Popup
1972 Datsun 510 Badass Monster!
1959 Corvette FI 283
1950 8N Ford Tractor (Harrison)

"Strive for perfection, excellence will be accepted."

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tschultz
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Re: 1979 633csi emissions without thermal reactors

Post by tschultz » Wed Jan 31, 2018 2:07 pm

I'd be interested to hear what you find out about this subject :)

'76-'82 are the only years that you have to worry about here, so only a select few of us have to worry about it.

oldbugeye
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Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Thu Feb 01, 2018 5:17 am

So I went to emmissions today and failed visual because after ten minutes of looking they couldn’t tell how the air injection system worked . Mine has been deleted. I just played stupid and he said if I could show him the how it worked he would pass me for that . I’m sure I could have easily made something up like it’s in the head and here is he hoses that feed it. So I have to make something look remotely like air injection. I also failed being 4x over on hc and a bit over on co . Idle was the worst. At 2500 rpm I was only over by 20% on hc and less for co . Some issues the car has are the fan clutch is stuck so it never warms up completely that doesn’t help I’m sure . I am going to smoke test it tomorrow to be 100% sure there is no vacuum leaks . I hear there is a way to adjust fuel trim at idle ? I will try that also after I fix the fan and any leaks . I was thinking about welding a Bolt in catalytic converter That goes in place of the resonator just for a emissions. Unless Someone knows of a direct Bolt in . At that point I think it will be pretty close if not passing . And I will of spent enough money to apply for the waiver. I got temp tags today and the lady there told me if I spend $715 at a shop which I work at lol , I can Be exempt from emissions for one cycle Which is five years for collectors plates. She also said that they really don’t check mileage which was the one thing keeping me from applying for collectors plates. You’re supposed to only drive 4500 miles a year.
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

GRNSHRK
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Re: 1979 633csi emissions without thermal reactors

Post by GRNSHRK » Thu Feb 01, 2018 5:23 pm

Sheesh, maybe CA ain't so bad after all #-o

I'm far from stock appearance under the hood as well, but they never even bother with that BS [-X

OK, upper left hand corner in the attached photo shows you where the idle mixture screw is [-o<

Please note that this view is upside down :shock:

Good luck, ya know, adding a cat permanently might not be all that bad of an idea after all :-k
Attachments
afm adjustment.jpeg
afm adjustment.jpeg (56.5 KiB) Viewed 901 times
:mrgreen:
Bobbo
1980 633 CSi
Cypress Green/Pearl Beige
2011 F10 528i
2005 E46 330 Ci ZHP Cabrio
Image

You can never have too many BMW's

baders
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Re: 1979 633csi emissions without thermal reactors

Post by baders » Fri Feb 02, 2018 1:11 am

Wow. EPA driven authoritarianism gone mad :shock: It's a near 40 YO car !!
1986 635csi LOCUTUS
Arktis Blau Metallic / Pearl Beige
S38B36/Close ratio dogleg 5sp
Perth Australia.

oldbugeye
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Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Fri Feb 02, 2018 2:11 am

I am just afraid the the car will destroy a cat because it runs rich all the time . Does the idle mixture screw turn that wheel or are they separate adjustments ?
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

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tschultz
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Re: 1979 633csi emissions without thermal reactors

Post by tschultz » Fri Feb 02, 2018 3:24 am

Separate. The idle adjustment screw is only for idle. Tighter for richer I believe, loosen for more lean.

oldbugeye
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Joined: Sat Dec 30, 2017 4:33 pm
Location: Colorado

Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Fri Feb 02, 2018 4:28 am

Thank you !
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

oldbugeye
Posts: 10
Joined: Sat Dec 30, 2017 4:33 pm
Location: Colorado

Re: 1979 633csi emissions without thermal reactors

Post by oldbugeye » Mon Apr 02, 2018 11:34 pm

So I got it to pass today just by putting on the old thermal reactors, and using a electric air pump from a z3 at the junkyard. I ran a hose to the air injector rail and wired the air pump to key on power . The whole project was 50 dollars or so and took about an hour and a half to install the reactors and run the air pump wiring plumbing ect. Thank you for all your help . I am excited to start driving this thing more ! It needs a manual transmission.
1979 bmw 633 csi
1992 Subaru Legacy turbo
1996 Subaru Impreza Rally car
Rally America #727

bpoliakoff
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Re: 1979 633csi emissions without thermal reactors

Post by bpoliakoff » Tue Apr 03, 2018 2:14 am

Nice thing about AZ is if you can show them you have classic car insurance and the car is over 25 years old, you don't need smog. Also if you get into another county other than where the PHX Valley is located, no smog. My car is put back to full euro specs, so since my brother in law is building a home in one of those counties, one way or another I will escape smog.
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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zinnocoupe
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Re: 1979 633csi emissions without thermal reactors

Post by zinnocoupe » Wed Apr 04, 2018 4:58 am

Wow amazing, congrats on passing. Will you remove the thermal reactors and replace with normal exhaust manifolds now? Or leave it. Please post pics of your free car!
Image
1979 Euro 635ci no longer a basketcase, just a running rust bucket!
1977 530i New addition ( nonrunner)
1987 635csi 60K KM Garage Queen

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