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Rb25det Neo Vs Non-neo Intake Ports Design

Stronzo

By Stronzo,
in Engines & Forced Induction

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Stronzo Collaborator

Stronzo

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Hi everyone,

I need to install neo rb25det intake manifold to non-neo rb25 engine.

The problem is that intake ports are different despite the same gasket. On the photo you can see rb25det neo manifold on the right and rb25 non-neo head on the left. The difference is in the injector section -- it is much smaller on the neo manifold.

I know that installing greddy front-mount manifolds is a usual thing for many of you -- so the question is -- do you grind intake ports on the neo head to match greddy manifolds (which are designed for r33 heads) or just install it with this port mismatch?

rb25neo_intake_ports_www.jpg

  • 1 month later...
Stronzo Collaborator

Stronzo

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ok, i`ve found the neo head and the head intake port design is exactly the same as in the non-neo head. That means that the port mismatch (as seen on the picture) between the neo head port and the neo intake manifold is designed by nissan for some reason -- maybe for extra turbulence right after the injector for better a/f mixture.

thanks, thread closed.

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