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whats this hole in the exhaust port for?

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Old Mar 6, 2008 | 11:31 PM
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whats this hole in the exhaust port for?
noob question

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Old Mar 6, 2008 | 11:35 PM
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It's a part of the EGR system.
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Old Mar 7, 2008 | 12:00 AM
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thanks. How does it work though?
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Old Mar 7, 2008 | 06:51 AM
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This should explain it better than I can > http://en.wikipedia.org/wiki/Exhaust_gas_recirculation
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Old Mar 7, 2008 | 10:23 AM
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JC evo1,

Is the recirc port just on one runner or is there a small inner port connecting to the other three cyl
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Old Mar 7, 2008 | 01:15 PM
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Bump for post 5,

Is that #4 in the pic? Is there a much smaller runner between the other cylinders to the one in the pic?
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Old Mar 7, 2008 | 02:54 PM
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yes its #4. THats the only port i think, its not my head just a picture i found to show where it is.
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