Improved Alfa 2.2 jts inlet manifold ?? - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 21-10-12 Thread Starter
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Alfa 159 2.2 jts

Improved Alfa 2.2 jts inlet manifold ??

On another massage board a came accross someone with an Opel/Vauxhall 2.2 Speedster, he changed his inlet manifod for a larger one from a 2.4 liter GM engine.

Today I did some more reasearch and discoverd that a lot of 2.2 Speedster owners change their inlet manifolds (some together with a larger TB) for the larger and better shaped Pontiac 2.4 inlet manifold (same engine but larger capacity). This manifold alone makes up for a nice improvement in throttle response and performance.

2.4 Inlet Manifold | Z22SE.co.uk

Ofcourse the Opel/Vauxhall 2.2 is basically the same engine as the 2.2 jts in the 159/Brera/Spider and with the same problems (chain). I know that Alfa Romeo changed the cilinder head but I'm not aware of any other changes. On the above mentioned website their are pictures of the original and improved inlet manifold.

I haven't checked on my 2.2 yet if the inlet monfold of the jts corresponds with the original Opel/Vauxhall version, but does anybody know if they are the same ?

And does anybody know if this modification is possible for the 2.2 jts as well ?

Last edited by OneManShow2; 21-10-12 at 19:05.
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Nope, that won't fit.
The 159 tb is on the side, not on top.
Also the inlet ports are shaped diffrently, jts has direct injection
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I read a few of those threads and most people say it either causes problems or to get it right its a lot of outlay for very little gain.

If you want a faster car buy the V6
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Alfa 159 2.2 jts

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Originally Posted by GhostyDog View Post
I read a few of those threads and most people say it either causes problems or to get it right its a lot of outlay for very little gain.

If you want a faster car buy the V6
I've read most of the threads and the problems (installation and poor engine running) are mainly due to the small/cramped engine bay, the fact that some installed a wrong version and the fact that a lot of them changed the Throttle Body for a different/larger one as well.

And if all, I wasn't planning on changing the latter and the change of the inlet manifold itself doesn't create any engine running problems.

The gains seem to be in the same region as a remap for roughly the same price as a remap.

And I know the V6 is faster :-)

Last edited by OneManShow2; 21-10-12 at 19:48.
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(Post Link) post #5 of 6 Old 21-10-12 Thread Starter
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Quote:
Originally Posted by Allerd View Post
Nope, that won't fit.
The 159 tb is on the side, not on top.
Also the inlet ports are shaped diffrently, jts has direct injection
Yep indeed, another difference I knew of is that the jts has direct injection.

And you seem to be right on the TB position:

Alfa 159 2.2 jts
http://www.johandevries.nl/images/pr...era--motor.jpg

GM 2.2
http://www.verboom.net/images/speeds...ine/engine.jpg

Last edited by OneManShow2; 21-10-12 at 22:41.
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Not sure on the design but I know on Peugeot engines there is a lot of material that can removed from the standard tb to increase performance

They also make and fit ptfe inlet gaskets between the head and manifold, this has being shown to significantly reduce inlet air temperatures

Has any one done them on an Alfa??
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