M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: Venom on February 26, 2014, 08:50:48 AM

Title: E30 exhaust manifold question
Post by: Venom on February 26, 2014, 08:50:48 AM

People, just a question on the below (taken from http://realoem.com/bmw/showparts.do?...54&hg=11&fg=50 )

(http://realoem.com/bmw/diagrams/b/w/3.png)

What's the point in the screws (no. 3) in the manifold? Not seen it it later model BMW's.

Title: Re: E30 exhaust manifold question
Post by: Warsteiner on February 26, 2014, 09:23:44 AM

Some headers have sampling ports for testing CO emissions. That's what those screws close off.

Cheers,
~Ralph

Title: Re: E30 exhaust manifold question
Post by: Venom on February 26, 2014, 10:10:33 AM

Thanks Ralph , had a feeling it was that or something to do with compression!

Title: Re: E30 exhaust manifold question
Post by: DesktopDave on February 26, 2014, 04:26:39 PM

There have been reports of later exhaust manifolds getting visual fails from Californian emissions stations, if you can believe it. It seems that BMW welded those four bungs shut at the factory, and nobody has successfully proved that this is an OEM modification.