Stainless steel manifold in alfa 147 2.0 - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 03-10-13 Thread Starter
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Stainless steel manifold in alfa 147 2.0

Hi

I woulda say is one stainless steel maniforld ( supersprint or other ) for alfa 14 2.
0 ts provides gain valuable power or torque ?

Thx
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(Post Link) post #2 of 6 Old 04-10-13 Thread Starter
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Hello

anyone ?

Many thx
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No, there is not a lot of power to gain in the manifold, you make the headers long , equal length and go straight from 4 into 1 but that will just push all your power high up the revs you will loose mid-range power.

This is on a S2000 race car:
http://alfagtv6.com/phpBB3/download/file.php?id=8978

The manifold is wielded on the inside which restricts airflow a bit - you can have it wielded up on the outside and port the inside, but still you will not gain all that much
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(Post Link) post #4 of 6 Old 05-10-13 Thread Starter
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Ok, many thx Gertie
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Yes you do need long primary's, 26" long. But it needs to be a 4-2-1, so with secondary's, 10" long. This is for a road car where you want torque all tge way through the rev range. For example, when on the motorway you want to over take you shouldn't need to drop it back a gear, it should have more power to pull away.
The manifold won't give much of a horsepower gain, but it will improve torque.

Did you get my PM Marc?
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What should the inner diameter be for, the 26" long primary and 10" secondary? And what should the length be, from the head to the first turn down?
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