What exh manifold is this?

[2002Targa]

This engine is for sale on a local CL ad.  I've had lots of 76's and they all had the reactor pipe wrapping around the back of the engine.  I've never seen one like this....

[John76]

This is the 49-state exhaust manifold for the '76.

The pipe you see in the front is the air injection and check valve  (the round disc) from the air pump.

'76 49-state cars did away with the dreaded thermal reactor and the EGR system, so you do not have a return pipe, the horrible EGR filter, or the "ever clogging" EGR valve.

This is a "keeper" if you need to still pass smog tests.

PS: California '76 cars are identical to the '75 cars with thermal reactor, air injection and EGR.

[Conserv]

Only the California version of the '76 had a thermal reactor.  The 49-state version did not.  The connection you're seeing at the front nose of the exhaust manifold is the line from the air pump and the one-way valve is just to the right of the timing chain sprocket. 

 

Below is my 49-state '76, with the heat shield/ air pre-heater in place.

 

Regards,

 

Steve

 

[jerry]

looks like the earlier variant used with single barrel Solex carbs.  if you pull it out it likely will have what appear to be thermocouples protruding into the exhaust ports.  i've taken them out and blocked the forward and aft holes and used them as a 'poor man's' tii cast manifold.  these are also the manifolds that came with those very cool cast aluminum heat shields. 

 

OK, i stand corrected.  nevermind my explanation.  i did not know that the cast heat shield was used on later cars...

Edited May 6, 2017 by jerry
incorrect data

[John76]

Steve,

Beautiful!!!

Your car looks just like mine...but I have the thermal reactor. Wish I could find a nice looking manifold and heat shield like yours.

I do have a Tii manifold with heat shield, but it won't pass our smog check in California.

[Conserv]

8 minutes ago, jerry said:

did not know that the cast heat shield was used on later cars...

 

The cast aluminum heat shield snuck back with the 49-state '76, but I believe it has a different part number from the earlier cast aluminum shields...

 

Regards,

 

Steve

 

[Conserv]

4 minutes ago, John76 said:

Steve,

Beautiful!!!

Your car looks just like mine...but I have the thermal reactor. Wish I could find a nice looking manifold and heat shield like yours.

I do have a Tii manifold with heat shield, but it won't pass our smog check in California.

 

Beautiful, John.  I'm confident lots of '76 manifolds were discarded over the years, in favor of headers, tii manifolds, etc.  Any chance the '74's used the same exhaust manifold as the '49-state '76 cars?  If so, that might expand your scope of search.

 

Best regards,

 

Steve

 

[Healey3000]

1 hour ago, Conserv said:

 

Beautiful, John.  I'm confident lots of '76 manifolds were discarded over the years, in favor of headers, tii manifolds, etc.  Any chance the '74's used the same exhaust manifold as the '49-state '76 cars?  If so, that might expand your scope of search.

 

Best regards,

 

Steve

 

Based on a data point of one, the '74 manifold is quite different.  My '74 has a port at the rear but not in the front like the one pictured above.

[Conserv]

10 hours ago, Healey3000 said:

Based on a data point of one, the '74 manifold is quite different.  My '74 has a port at the rear but not in the front like the one pictured above.

 

Hmm...  Port at the rear, no port at the front?  That sounds like a thermal reactor manifold.  Wait, do '74's have the full thermal reactor "suite"?  I've always viewed '75's and California '76's as the thermal reactor cars, but maybe U.S. '74's are similarly afflicted.  I don't know.  Someone here knows!

 

And how about early U.S. e21's (320i's)?  Could they share manifolds with the '76 49-state '02?

 

Regards,

 

Steve

 

Edited May 6, 2017 by Conserv

[Healey3000]

The one I have is not a thermal reactor type.  It is very similar to a '73 except for the orientation of the port at the rear.  In the picture, the one on the left is the '74 and the one on the right a '73.  Both have identical exhaust port sizes but the emissions (EGR?) ports are slightly different in placement.

[Conserv]

28 minutes ago, Healey3000 said:

The one I have is not a thermal reactor type.  It is very similar to a '73 except for the orientation of the port at the rear.  In the picture, the one on the left is the '74 and the one on the right a '73.  Both have identical exhaust port sizes but the emissions (EGR?) ports are slightly different in placement.

 

I see!  Thanks for posting the photo.  Someone here will enlighten us!

 

Regards,

 

Steve

 

Edited May 6, 2017 by Conserv

[Mark92131]

5 hours ago, Conserv said:

Wait, do '74's have the full thermal reactor "suite"?

 

The 74's had the port in the back on the manifold that connects to the EGR Filter, but not thermal reactor tubes in the individual exhaust ports.  The main difference was no smog pump on the 74 and no Black Electromagnetic valve for the vacuum advance on the distributor.

 

Mark92131

 

 

Edited May 6, 2017 by Mark92131

[laundromatt]

Is there a benefit to keeping the heat shield?  Not sure what to do about mine when I replace my non-tii exhaust manifold with a tii one.  

[Healey3000]

17 minutes ago, laundromatt said:

Is there a benefit to keeping the heat shield?  Not sure what to do about mine when I replace my non-tii exhaust manifold with a tii one.  

You could use the e30 318i manifold gasket with integral heat shield.  Works very well.

[rstclark]

John

If you are in California and 

need to pass smog then try to find a 49 state manifold and use the 49 state equipment this will eliminate the thermal reactor.  From my experience Smog stations have very little experience with a 76 2002 and will check it as a 49 state car because that's what they are seeing If you still have the California emissions sticker on the left front of the engine compartment. Remove it

There is no record to show that it was not a 49 state car

Follow the emissions diagram that Mark posted  Any missing equipment can be found Good luck in your search