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Landracing Forum Home > Tech Information > EFI Questions (Moderator: Seldom Seen Slim) > 90 mm tbi
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Author Topic: 90 mm tbi  (Read 1400 times)
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KEVIN
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« on: October 11, 2007, 07:49:04 PM »
Can anyone  tell me what a 90 mm throttle body will flow in CFM?
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Peter Jack
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« Reply #1 on: October 11, 2007, 09:37:36 PM »
Depends on how much displacement is trying to pull the air through.

Pete
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fwillyj
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« Reply #2 on: October 11, 2007, 10:39:43 PM »
-the effective square inch area of a 90mm throttle body would be about 8.5 square inches.

-from testing I have done at 25" of water test pressure----I'd suspect about it would flow about the same as typical race prepared ports that I have measure to flow between 96 and 126 CFM per square inch.

-so this would 816 to 1071 cfm.

-in comparison I have found a variety of sharp edge orifices to all flow flow 84.4 CFM per square inch----and a variety of simple venturi shapes about 3.5" long that all flow within 200 to 209 CFM per square inch.
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