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Ported Exhaust Manifold or Power Log?

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Old 12-14-2011, 09:08 AM
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Default Ported Exhaust Manifold or Power Log?

Greetings,

If you had a choice between a power log or PEM's, which would you choose? And, if you are adventurous enough, why?
 
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Old 12-14-2011, 09:19 AM
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Plog

Even ported manifolds doesn't help the flow of that front manifold enough... Terrible design
 
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Old 12-14-2011, 09:44 AM
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You can't PORT the front manifold very much because it is not round. It has a crescent moon shape.

The PLOG makes the front manifolds round and the collector is larger.

Ported rear manifold is pretty decent though if it is cheaper than a rear plog.
 
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Old 12-14-2011, 09:46 AM
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They make rear Plogs? I've never seen this.
 
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Old 12-14-2011, 10:02 AM
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Originally Posted by Shandley View Post
They make rear Plogs? I've never seen this.
It's for turbo applications

ZZPerformance - Rear Power Log for Turbo #07-01-00958
 
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Old 12-14-2011, 10:31 AM
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Originally Posted by ChibiBlackSheep View Post
You can't PORT the front manifold very much because it is not round. It has a crescent moon shape.

The PLOG makes the front manifolds round and the collector is larger.

Ported rear manifold is pretty decent though if it is cheaper than a rear plog.
D-porting is possible and if done correctly results in better flow dynamics than round primaries due to the shape of the exhaust port on the head itself. It's D shaped as well. You can imagine if you stick a round tube over a D shaped port and run anything through it you create a turbulence due to overlap on the flat side.
 
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Old 12-14-2011, 11:45 AM
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I had the choice and I went PLOG. It seems like a better idea to me (more open to flow better, removing the front mani from being a restriction in the set up).
 
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