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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.

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:
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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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Joined: Sat Dec 30, 2017 4:33 pm
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 !

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

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 .

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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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Location: Colorado

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 .

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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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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
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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
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