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Forum name	Performance/Engine
Topic subject	Why go so large in TB when the manifold is so small?
Topic URL	http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=113827&mesg_id=113827
113827, Why go so large in TB when the manifold is so small? Posted by JustOne, Dec-31-69 06:00 PM I was looking at the stock intake manifold. It only has a 52mm opening, so why would you go larger than that opening in a TB? Your air flow would just hit a wall when it meets the step up from the larger TB to the actual size of the hole on the intake. Are the larger TB's tapered from the large opening to the 52mm of the stock manifold? If so I could see some benefit of that because the air would speed up as it when through the TB. I am just curious what you guys do about that? What would be the point of putting a 60mm straight through TB on your manifold if there is a large step from 60mm to 52mm Just curious Brain

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