Alfetta Sprint Veloce 1978/79" Exhaust Manifold

[RossoGTV4Me]

Can someone just confirm for me that the Alfetta Sprint Veloce for 1978/79" Exhaust Manifold 4 into 2 into 1 is a different manifold then the older Alfetta 4 into 1manifold. I was told it is different.

Thanks guys.

[PSk]

The 105/115 series have a 2 into 2 into 1 system that goes behind the front cross member.

The 116 series has a 2 into 2 into 1 system that branches infront AND behind the front cross member.

... but a 4 into 1 system can be installed in either chassis.
Pete

[RossoGTV4Me]

Yes, just talking about 116 Alfetta exhaust manifolds here.

To my knowledge there were (3) differen't cast iron manifolds for the Alfetta.

Who is able to confirm?

1. US -1976 and 1977 4 into 1 manifolds
2. US-1978 and 1979 Alfetta Sprint Veloce 4 into 2 into 1 manifolds
3. Euro- 4 into 2 manifolds

[RossoGTV4Me]

I beleive this is a picture of the US-1978 and 1979 Alfetta Sprint Veloce 4 into 2 into 1 exhasut manifolds.

Can anyone point out the visual diffrences between the other (2) named above.

I beleive they have the circle bolts on the exterior on them like the euro header but look more like the std. US 116 header being
4-2-1.

[italcarguy]

Quote:

Originally Posted by RossoGTV4Me Can someone just confirm for me that the Alfetta Sprint Veloce for 1978/79" Exhaust Manifold 4 into 2 into 1 is a different manifold then the older Alfetta 4 into 1manifold. I was told it is different. Thanks guys.

[Ozalfaracer]

Rosso: Just to clarify before I get into it, the manifold in your attached picture should have two downpipes but because it's one manifold that combines the four exhaust ports into one common outlet, I'll call it a four into one. I'm pretty sure the following info is correct, if not, I know someone will correct me. It goes like this.

ALL US Alfetta's came with the very poor performing 4 into one exhaust manifold as illustrated in the picture you provided. My '79 GTV Sprint Veloce had one and I've never seen anything different sent to the USA from the factory on GTV's, Sports Sedans, Alfetta Sedans, etc. Apparently this was an emissions issue although exactly how a really crappy exhaust manifold like that helped with emissions is beyond me (probably something to do with exhaust gas temps). I never made the comparison, so I'll stand corrected, but it could be the same as the 4 into 1 manifiold that was fitted to the Bosch injected Spiders sold in the US from '82 through '89 (I think late '89 was when the first Motronic Spiders came out, very limited numbers before the series 4 spider was released. All series 4 cars had Motronic FI, they also had the early style 4 into 2 exhaust manifolds as supplied on the 105 series cars).

I believe all 4 cylinder transaxle cars for the rest of the world received the two piece 4 into 2 exhaust manifolds which looked very much like what you'll be used to seeing on the 105 series cars. If you look at some of the aftermarket parts catalogs you'll see that many of them offer the "euro downpipe" for the Alfetta's which has one pipe in front of and one pipe behind the front crossmember. The US exhaust manifold had the downpipes routed behind the crossmember. I seem to remember that the Euro setup (standard Euro exhaust manifolds and downpipe) was good for an additional 5 or 6 HP on Spica injected cars with no other mods and would flow well enough to make mild cams and other mods worthwhile. Anything much beyond that required the use of headers to get the ful benefit. Let me know if you want a set of the Euro items, they seem to be pretty available here in Oz.

Best regards, Rick.

[iachella]

Brandon:

Your list of manifolds is correct. The early Alfettas had a single downpipe that went behind the engine mount and out the back of the car. The manifold would be a true 4-1. They later changed it to two parrallel but right next to each other. So the manifold was a one piece 4-2. The downpipes had a one piece flange with two ports, like the one in your picture, but hard to see. The two pipes went down at the same place and bent back and come together into one at about the same place as the Euro downpipes would have come together.

I think the one piece manifolds had something to do with the air rail that was mounted. Maybe they suspected that a two piece manifold would not be stable enough to sustain the air rail without cracking it. If that was the case, it would be over-design, because I took a Euro manifold and had it drilled and tapped for the air rail to pass CA smog. The bellows that are in between the each port on the rail do a fine job of damping any vibrations and my air rail has lasted many years without failing.

The first manifolds were truely horrible, the second kind were just really bad. The Euro ones would be essentially as good as the early 105 ones. Non-NA Alfetta owners should be glad that they never had to deal with these manifolds.

[ossodiseppia]

The first series Alfettas came with a 4 into 1 header. The second series Alfettas came with a 4 into 2 header. The second series 4 into 2 provides better performance. If you are shopping for a second series header, make sure to get the air rail with it. They are not interchangeable.

Here's a page from the parts manual.